diff --git a/ai/build.gradle b/ai/build.gradle
new file mode 100644
index 0000000..3fa4609
--- /dev/null
+++ b/ai/build.gradle
@@ -0,0 +1,15 @@
+bootJar {
+    archiveFileName = 'ai.jar'
+}
+
+dependencies {
+    // OpenAI
+    implementation "com.theokanning.openai-gpt3-java:service:${openaiVersion}"
+
+    // Azure AI Search
+    implementation "com.azure:azure-search-documents:${azureAiSearchVersion}"
+
+    // Feign (for external API calls)
+    implementation "io.github.openfeign:feign-jackson:${feignJacksonVersion}"
+    implementation "io.github.openfeign:feign-okhttp:${feignJacksonVersion}"
+}
diff --git a/ai/src/main/resources/application.yml b/ai/src/main/resources/application.yml
new file mode 100644
index 0000000..aaf465b
--- /dev/null
+++ b/ai/src/main/resources/application.yml
@@ -0,0 +1,111 @@
+spring:
+  application:
+    name: ai
+
+  # Database Configuration
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:20.249.153.213}:${DB_PORT:5432}/${DB_NAME:aidb}
+    username: ${DB_USERNAME:hgzerouser}
+    password: ${DB_PASSWORD:}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000
+
+  # JPA Configuration
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+
+  # Redis Configuration
+  data:
+    redis:
+      host: ${REDIS_HOST:20.249.177.114}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:3}
+
+# Server Configuration
+server:
+  port: ${SERVER_PORT:8083}
+
+# JWT Configuration
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# OpenAI Configuration
+openai:
+  api-key: ${OPENAI_API_KEY:}
+  model: ${OPENAI_MODEL:gpt-4}
+  max-tokens: ${OPENAI_MAX_TOKENS:2000}
+  temperature: ${OPENAI_TEMPERATURE:0.7}
+
+# Azure AI Search Configuration
+azure:
+  aisearch:
+    endpoint: ${AZURE_AISEARCH_ENDPOINT:}
+    api-key: ${AZURE_AISEARCH_API_KEY:}
+    index-name: ${AZURE_AISEARCH_INDEX_NAME:minutes-index}
+
+# Actuator Configuration
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging Configuration
+logging:
+  level:
+    com.unicorn.hgzero.ai: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:DEBUG}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/ai.log}
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..2d172ab
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,132 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.3.0' apply false
+    id 'io.spring.dependency-management' version '1.1.6' apply false
+    id 'io.freefair.lombok' version '8.10' apply false
+}
+
+group = 'com.unicorn.hgzero'
+version = '1.0.0'
+
+allprojects {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+subprojects {
+    apply plugin: 'java'
+    apply plugin: 'io.freefair.lombok'
+
+    java {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+
+    configurations {
+        compileOnly {
+            extendsFrom annotationProcessor
+        }
+    }
+
+    tasks.named('test') {
+        useJUnitPlatform()
+    }
+
+    // Common versions for all subprojects
+    ext {
+        jjwtVersion = '0.12.5'
+        springdocVersion = '2.5.0'
+        mapstructVersion = '1.5.5.Final'
+        commonsLang3Version = '3.14.0'
+        commonsIoVersion = '2.16.1'
+        hypersistenceVersion = '3.7.3'
+        openaiVersion = '0.18.2'
+        feignJacksonVersion = '13.1'
+        azureSpeechVersion = '1.37.0'
+        azureBlobVersion = '12.25.3'
+        azureEventHubsVersion = '5.18.2'
+        azureAiSearchVersion = '11.6.2'
+        springAiVersion = '1.0.0-M1'
+    }
+}
+
+// Configure all subprojects with Spring dependency management
+subprojects {
+    apply plugin: 'io.spring.dependency-management'
+
+    dependencyManagement {
+        imports {
+            mavenBom "org.springframework.cloud:spring-cloud-dependencies:2023.0.2"
+        }
+    }
+}
+
+// Configure only service modules (exclude common)
+configure(subprojects.findAll { it.name != 'common' }) {
+    apply plugin: 'org.springframework.boot'
+
+    dependencies {
+        // Common module dependency
+        implementation project(':common')
+
+        // Spring Boot Starters
+        implementation 'org.springframework.boot:spring-boot-starter-web'
+        implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+        implementation 'org.springframework.boot:spring-boot-starter-security'
+        implementation 'org.springframework.boot:spring-boot-starter-validation'
+
+        // Actuator for health checks and monitoring
+        implementation 'org.springframework.boot:spring-boot-starter-actuator'
+
+        // API Documentation (common across all services)
+        implementation "org.springdoc:springdoc-openapi-starter-webmvc-ui:${springdocVersion}"
+
+        // JWT
+        implementation "io.jsonwebtoken:jjwt-api:${jjwtVersion}"
+        runtimeOnly "io.jsonwebtoken:jjwt-impl:${jjwtVersion}"
+        runtimeOnly "io.jsonwebtoken:jjwt-jackson:${jjwtVersion}"
+
+        // Database
+        runtimeOnly 'org.postgresql:postgresql'
+
+        // Redis
+        implementation 'org.springframework.boot:spring-boot-starter-data-redis'
+
+        // Utilities
+        implementation "org.apache.commons:commons-lang3:${commonsLang3Version}"
+        implementation "commons-io:commons-io:${commonsIoVersion}"
+        implementation "org.mapstruct:mapstruct:${mapstructVersion}"
+        annotationProcessor "org.mapstruct:mapstruct-processor:${mapstructVersion}"
+
+        // Testing
+        testImplementation 'org.springframework.boot:spring-boot-starter-test'
+        testImplementation 'org.springframework.security:spring-security-test'
+        testImplementation 'org.testcontainers:junit-jupiter'
+        testImplementation 'org.mockito:mockito-junit-jupiter'
+
+        // Configuration Processor
+        annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+    }
+}
+
+// Java version consistency check for all modules
+tasks.register('checkJavaVersion') {
+    doLast {
+        println "Java Version: ${System.getProperty('java.version')}"
+        println "Java Home: ${System.getProperty('java.home')}"
+    }
+}
+
+// Clean task for all subprojects
+tasks.register('cleanAll') {
+    dependsOn subprojects.collect { it.tasks.named('clean') }
+    description = 'Clean all subprojects'
+}
+
+// Build task for all subprojects
+tasks.register('buildAll') {
+    dependsOn subprojects.collect { it.tasks.named('build') }
+    description = 'Build all subprojects'
+}
diff --git a/claude/dev-backend.md b/claude/dev-backend.md
new file mode 100644
index 0000000..81ece9d
--- /dev/null
+++ b/claude/dev-backend.md
@@ -0,0 +1,662 @@
+# 백엔드 개발 가이드 
+
+[요청사항]  
+- <개발원칙>을 준용하여 개발
+- <개발순서>에 따라 아래 3단계로 개발
+  - '0. 준비'를 수행하고 완료 후 다음 단계 진행여부를 사용자에게 확인  
+  - '1. common 모듈 개발'을 수행하고 완료 후 다음 단계 진행여부를 사용자에게 확인   
+  - '2. 각 서비스별 구현'은 사용자와 함께 각 서비스를 개발  
+  
+[가이드]
+<개발원칙>
+- '개발주석표준'에 맞게 주석 작성
+- API설계서와 일관성 있게 설계. Controller에 API를 누락하지 말고 모두 개발
+- '외부시퀀스설계서'와 '내부시퀀스설계서'와 일치되도록 개발 
+- 각 서비스별 지정된 {설계 아키텍처 패턴}을 적용하여 개발
+  - Layered 아키텍처 적용 시 Service레이어에 Interface 사용 
+  - Clean아키텍처 적용 시 Port/Adapter라는 용어 대신 Clean 아키텍처에 맞는 용어 사용
+- 백킹서비스 연동은 '데이터베이스설치결과서', '캐시설치결과서', 'MQ설치결과서'를 기반으로 개발  
+- 빌드도구는 Gradle 사용   
+- 설정 Manifest(src/main/resources/application*.yml) 작성 시 '[설정 Manifest 표준]' 준용  
+<개발순서>
+- 0. 준비:
+  - 참고자료 분석 및 이해 
+  - '패키지구조표준'의 예시를 참조하여 모든 클래스와 파일이 포함된 패키지 구조도를 작성 
+    - plantuml 스크립트가 아니라 트리구조 텍스트로 작성
+    - 결과파일: develop/dev/package-structure.md   
+  - settings.gralde 파일 작성
+  - build.gradle 작성
+    - '<Build.gradle 구성 최적화>' 가이드대로 최상위와 각 서비스별 build.gradle 작성 
+    - '[루트 build.gradle 표준]'대로 최상위 build.gradle 작성
+      - SpringBoot 3.3.0, Java 21 사용 
+      - common을 제외한 각 서비스에서 공통으로 사용되는 설정과 Dependency는 루트 build.gradle에 지정   
+    - 서비스별 build.gradle 작성
+      - 최상위 build.gradle에 정의한 설정은 각 마이크로서비스의 build.gradle에 중복하여 정의하지 않도록 함   
+      - 각 서비스의 실행 jar 파일명은 서비스명과 동일하게 함 
+  - 각 서비스별 설정 파일 작성 
+    - 설정 Manifest(application.yml) 작성: '[설정 Manifest 표준]' 준용   
+
+- 1. common 모듈 개발 
+  - 각 서비스에서 공통으로 사용되는 클래스를 개발
+  - 외부(웹브라우저, 데이터베이스, Message Queue, 외부시스템)와의 인터페이스를 위한 클래스는 포함하지 않음  
+  - 개발 완료 후 컴파일 및 에러 해결: {프로젝트 루트}/gradlew common:compileJava
+
+- 2. 각 서비스별 개발  
+  - 사용자가 제공한 서비스의 유저스토리, 외부시퀀스설계서, 내부시퀀스설계서, API설계서 파악 
+  - 기존 개발 결과 파악 
+  - API 설계서의 각 API를 순차적으로 개발 
+    - Controller -> Service -> Data 레이어순으로 순차적으로 개발  
+    - 컴파일 및 에러 해결: {프로젝트 루트}/gradlew {service-name}:compileJava
+    - 컴파일까지만 하고 서버 실행은 하지 않음 
+  - 모든 API개발 후 아래 수행
+    - 컴파일 및 에러 해결: {프로젝트 루트}/gradlew {service-name}:compileJava 
+    - 빌드 및 에러 해결: {프로젝트 루트}/gradlew {service-name}:build 
+  - SecurityConfig 클래스 작성: '<SecurityConfig 예제>' 참조 
+  - JWT 인증 처리 클래스 작성: '<JWT 인증처리 예제>' 참조 
+  - Swagger Config 클래스 작성: '<SwaggerConfig 예제>' 참조 
+  - 테스트 코드 작성은 하지 않음     
+
+
+<Build.gradle 구성 최적화>
+- **중앙 버전 관리**: 루트 build.gradle의 `ext` 블록에서 모든 외부 라이브러리 버전 통일 관리
+- **Spring Boot BOM 활용**: Spring Boot/Cloud에서 관리하는 라이브러리는 버전 명시 불필요 (자동 호환성 보장)
+- **Common 모듈 설정**: `java-library` + Spring Boot 플러그인 조합, `bootJar` 비활성화로 일반 jar 생성
+- **서비스별 최적화**: 공통 의존성(API 문서화, 테스트 등)은 루트에서 일괄 적용
+- **JWT 버전 통일**: 라이브러리 버전 변경시 API 호환성 확인 필수 (`parserBuilder()` → `parser()`)
+- **dependency-management 적용**: 모든 서브프로젝트에 Spring BOM 적용으로 버전 충돌 방지
+
+[참고자료]
+- 유저스토리
+- API설계서
+- 외부시퀀스설계서
+- 내부시퀀스설계서
+- 데이터베이스설치결과서
+- 캐시설치결과서
+- MQ설치결과서
+- 테스트코드표준
+- 패키지구조표준
+ 
+---
+
+[설정 Manifest 표준]
+- common모듈은 작성하지 않음 
+- application.yml에 작성 
+- 하드코딩하지 않고 환경변수 사용
+  특히, 데이터베이스, MQ 등의 연결 정보는 반드시 환경변수로 변환해야 함: '<DB/Redis 설정 예제>' 참조   
+- spring.application.name은 서비스명과 동일하게 함
+- Redis Database는 각 서비스마다 다르게 설정  
+- 민감한 정보의 디폴트값은 생략하거나 간략한 값으로 지정
+- JWT Secret Key는 모든 서비스가 동일해야 함 
+- '[JWT,CORS,Actuaotr,OpenAPI Documentation,Loggings 표준]'을 준수하여 설정
+ 
+[JWT, CORS, Actuaotr,OpenAPI Documentation,Loggings 표준]
+```
+# JWT 
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:1800}  
+  refresh-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:86400} 
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# Actuator
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging
+logging:
+  level:
+    {서비스 패키지 경로}: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/{서비스명}.log}
+
+```
+
+[루트 build.gradle 표준]
+```
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.3.0' apply false
+    id 'io.spring.dependency-management' version '1.1.6' apply false
+    id 'io.freefair.lombok' version '8.10' apply false
+}
+
+group = 'com.unicorn.{시스템명}'
+version = '1.0.0'
+
+allprojects {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+subprojects {
+    apply plugin: 'java'
+    apply plugin: 'io.freefair.lombok'
+
+    java {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+
+    configurations {
+        compileOnly {
+            extendsFrom annotationProcessor
+        }
+    }
+
+    tasks.named('test') {
+        useJUnitPlatform()
+    }
+    
+    // Common versions for all subprojects
+    ext {
+        jjwtVersion = '0.12.5'
+        springdocVersion = '2.5.0'
+        mapstructVersion = '1.5.5.Final'
+        commonsLang3Version = '3.14.0'
+        commonsIoVersion = '2.16.1'
+        hypersistenceVersion = '3.7.3'
+        openaiVersion = '0.18.2'
+        feignJacksonVersion = '13.1'
+    }
+}
+
+// Configure all subprojects with Spring dependency management
+subprojects {
+    apply plugin: 'io.spring.dependency-management'
+
+    dependencyManagement {
+        imports {
+            mavenBom "org.springframework.cloud:spring-cloud-dependencies:2023.0.2"
+        }
+    }
+}
+
+// Configure only service modules (exclude common)
+configure(subprojects.findAll { it.name != 'common' }) {
+    apply plugin: 'org.springframework.boot'
+
+    dependencies {
+        // Common module dependency
+        implementation project(':common')
+        
+        // Actuator for health checks and monitoring
+        implementation 'org.springframework.boot:spring-boot-starter-actuator'
+        
+        // API Documentation (common across all services)
+        implementation "org.springdoc:springdoc-openapi-starter-webmvc-ui:${springdocVersion}"
+        
+        // Testing
+        testImplementation 'org.springframework.boot:spring-boot-starter-test'
+        testImplementation 'org.springframework.security:spring-security-test'
+        testImplementation 'org.testcontainers:junit-jupiter'
+        testImplementation 'org.mockito:mockito-junit-jupiter'
+        
+        // Configuration Processor
+        annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+    }
+}
+
+// Java version consistency check for all modules
+tasks.register('checkJavaVersion') {
+    doLast {
+        println "Java Version: ${System.getProperty('java.version')}"
+        println "Java Home: ${System.getProperty('java.home')}"
+    }
+}
+
+// Clean task for all subprojects
+tasks.register('cleanAll') {
+    dependsOn subprojects.collect { it.tasks.named('clean') }
+    description = 'Clean all subprojects'
+}
+
+// Build task for all subprojects
+tasks.register('buildAll') {
+    dependsOn subprojects.collect { it.tasks.named('build') }
+    description = 'Build all subprojects'
+}
+```
+
+<DB/Redis 설정 예제>
+```
+spring:
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:localhost}:${DB_PORT:5432}/${DB_NAME:phonebill_auth}
+    username: ${DB_USERNAME:phonebill_user}
+    password: ${DB_PASSWORD:phonebill_pass}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000      
+  # JPA 설정
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+      
+  # Redis 설정
+  data:
+    redis:
+      host: ${REDIS_HOST:localhost}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:0}
+  
+```
+
+<SecurityConfig 예제>
+```
+/**
+ * Spring Security 설정
+ * JWT 기반 인증 및 API 보안 설정
+ */
+@Configuration
+@EnableWebSecurity
+@RequiredArgsConstructor
+public class SecurityConfig {
+
+    private final JwtTokenProvider jwtTokenProvider;
+    
+    @Value("${cors.allowed-origins:http://localhost:3000,http://localhost:8080,http://localhost:8081,http://localhost:8082,http://localhost:8083,http://localhost:8084}")
+    private String allowedOrigins;
+
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        return http
+                .csrf(AbstractHttpConfigurer::disable)
+                .cors(cors -> cors.configurationSource(corsConfigurationSource()))
+                .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
+                .authorizeHttpRequests(auth -> auth
+                        // Actuator endpoints
+                        .requestMatchers("/actuator/**").permitAll()
+                        // Swagger UI endpoints - context path와 상관없이 접근 가능하도록 설정
+                        .requestMatchers("/swagger-ui/**", "/swagger-ui.html", "/v3/api-docs/**", "/swagger-resources/**", "/webjars/**").permitAll()
+                        // Health check
+                        .requestMatchers("/health").permitAll()
+                        // All other requests require authentication
+                        .anyRequest().authenticated()
+                )
+                .addFilterBefore(new JwtAuthenticationFilter(jwtTokenProvider), 
+                                UsernamePasswordAuthenticationFilter.class)
+                .build();
+    }
+
+    @Bean
+    public CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration configuration = new CorsConfiguration();
+        
+        // 환경변수에서 허용할 Origin 패턴 설정
+        String[] origins = allowedOrigins.split(",");
+        configuration.setAllowedOriginPatterns(Arrays.asList(origins));
+        
+        // 허용할 HTTP 메소드
+        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"));
+        
+        // 허용할 헤더
+        configuration.setAllowedHeaders(Arrays.asList(
+            "Authorization", "Content-Type", "X-Requested-With", "Accept", 
+            "Origin", "Access-Control-Request-Method", "Access-Control-Request-Headers"
+        ));
+        
+        // 자격 증명 허용
+        configuration.setAllowCredentials(true);
+        
+        // Pre-flight 요청 캐시 시간
+        configuration.setMaxAge(3600L);
+
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/**", configuration);
+        return source;
+    }
+}
+```
+
+<JWT 인증처리 예제>
+
+1) JwtAuthenticationFilter
+```
+/**
+ * JWT 인증 필터
+ * HTTP 요청에서 JWT 토큰을 추출하여 인증을 수행
+ */
+@Slf4j
+@RequiredArgsConstructor
+public class JwtAuthenticationFilter extends OncePerRequestFilter {
+
+    private final JwtTokenProvider jwtTokenProvider;
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, 
+                                  HttpServletResponse response, 
+                                  FilterChain filterChain) throws ServletException, IOException {
+        
+        String token = jwtTokenProvider.resolveToken(request);
+        
+        if (StringUtils.hasText(token) && jwtTokenProvider.validateToken(token)) {
+            String userId = jwtTokenProvider.getUserId(token);
+            String username = null;
+            String authority = null;
+            
+            try {
+                username = jwtTokenProvider.getUsername(token);
+            } catch (Exception e) {
+                log.debug("JWT에 username 클레임이 없음: {}", e.getMessage());
+            }
+            
+            try {
+                authority = jwtTokenProvider.getAuthority(token);
+            } catch (Exception e) {
+                log.debug("JWT에 authority 클레임이 없음: {}", e.getMessage());
+            }
+            
+            if (StringUtils.hasText(userId)) {
+                // UserPrincipal 객체 생성 (username과 authority가 없어도 동작)
+                UserPrincipal userPrincipal = UserPrincipal.builder()
+                    .userId(userId)
+                    .username(username != null ? username : "unknown")
+                    .authority(authority != null ? authority : "USER")
+                    .build();
+                
+                UsernamePasswordAuthenticationToken authentication = 
+                    new UsernamePasswordAuthenticationToken(
+                        userPrincipal, 
+                        null, 
+                        Collections.singletonList(new SimpleGrantedAuthority(authority != null ? authority : "USER"))
+                    );
+                
+                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
+                SecurityContextHolder.getContext().setAuthentication(authentication);
+                
+                log.debug("인증된 사용자: {} ({})", userPrincipal.getUsername(), userId);
+            }
+        }
+        
+        filterChain.doFilter(request, response);
+    }
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) {
+        String path = request.getRequestURI();
+        return path.startsWith("/actuator") || 
+               path.startsWith("/swagger-ui") || 
+               path.startsWith("/v3/api-docs") || 
+               path.equals("/health");
+    }
+}
+```
+
+1) JwtTokenProvider
+```
+/**
+ * JWT 토큰 제공자
+ * JWT 토큰의 생성, 검증, 파싱을 담당
+ */
+@Slf4j
+@Component
+public class JwtTokenProvider {
+
+    private final SecretKey secretKey;
+    private final long tokenValidityInMilliseconds;
+
+    public JwtTokenProvider(@Value("${jwt.secret}") String secret,
+                           @Value("${jwt.access-token-validity:3600}") long tokenValidityInSeconds) {
+        this.secretKey = Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8));
+        this.tokenValidityInMilliseconds = tokenValidityInSeconds * 1000;
+    }
+
+    /**
+     * HTTP 요청에서 JWT 토큰 추출
+     */
+    public String resolveToken(HttpServletRequest request) {
+        String bearerToken = request.getHeader("Authorization");
+        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith("Bearer ")) {
+            return bearerToken.substring(7);
+        }
+        return null;
+    }
+
+    /**
+     * JWT 토큰 유효성 검증
+     */
+    public boolean validateToken(String token) {
+        try {
+            Jwts.parser()
+                .setSigningKey(secretKey)
+                .build()
+                .parseClaimsJws(token);
+            return true;
+        } catch (SecurityException | MalformedJwtException e) {
+            log.debug("Invalid JWT signature: {}", e.getMessage());
+        } catch (ExpiredJwtException e) {
+            log.debug("Expired JWT token: {}", e.getMessage());
+        } catch (UnsupportedJwtException e) {
+            log.debug("Unsupported JWT token: {}", e.getMessage());
+        } catch (IllegalArgumentException e) {
+            log.debug("JWT token compact of handler are invalid: {}", e.getMessage());
+        }
+        return false;
+    }
+
+    /**
+     * JWT 토큰에서 사용자 ID 추출
+     */
+    public String getUserId(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+        
+        return claims.getSubject();
+    }
+
+    /**
+     * JWT 토큰에서 사용자명 추출
+     */
+    public String getUsername(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+        
+        return claims.get("username", String.class);
+    }
+
+    /**
+     * JWT 토큰에서 권한 정보 추출
+     */
+    public String getAuthority(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+        
+        return claims.get("authority", String.class);
+    }
+
+    /**
+     * 토큰 만료 시간 확인
+     */
+    public boolean isTokenExpired(String token) {
+        try {
+            Claims claims = Jwts.parser()
+                .setSigningKey(secretKey)
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+            
+            return claims.getExpiration().before(new Date());
+        } catch (Exception e) {
+            return true;
+        }
+    }
+
+    /**
+     * 토큰에서 만료 시간 추출
+     */
+    public Date getExpirationDate(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+        
+        return claims.getExpiration();
+    }
+}
+```
+
+1) UserPrincipal
+```
+/**
+ * 인증된 사용자 정보
+ * JWT 토큰에서 추출된 사용자 정보를 담는 Principal 객체
+ */
+@Getter
+@Builder
+@RequiredArgsConstructor
+public class UserPrincipal {
+    
+    /**
+     * 사용자 고유 ID
+     */
+    private final String userId;
+    
+    /**
+     * 사용자명
+     */
+    private final String username;
+    
+    /**
+     * 사용자 권한
+     */
+    private final String authority;
+    
+    /**
+     * 사용자 ID 반환 (별칭)
+     */
+    public String getName() {
+        return userId;
+    }
+    
+    /**
+     * 관리자 권한 여부 확인
+     */
+    public boolean isAdmin() {
+        return "ADMIN".equals(authority);
+    }
+    
+    /**
+     * 일반 사용자 권한 여부 확인
+     */
+    public boolean isUser() {
+        return "USER".equals(authority) || authority == null;
+    }
+}
+```
+
+<SwaggerConfig 예제>
+```
+/**
+ * Swagger/OpenAPI 설정
+ * AI Service API 문서화를 위한 설정
+ */
+@Configuration
+public class SwaggerConfig {
+
+    @Bean
+    public OpenAPI openAPI() {
+        return new OpenAPI()
+                .info(apiInfo())
+                .addServersItem(new Server()
+                        .url("http://localhost:8084")
+                        .description("Local Development"))
+                .addServersItem(new Server()
+                        .url("{protocol}://{host}:{port}")
+                        .description("Custom Server")
+                        .variables(new io.swagger.v3.oas.models.servers.ServerVariables()
+                                .addServerVariable("protocol", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("http")
+                                        .description("Protocol (http or https)")
+                                        .addEnumItem("http")
+                                        .addEnumItem("https"))
+                                .addServerVariable("host", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("localhost")
+                                        .description("Server host"))
+                                .addServerVariable("port", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("8084")
+                                        .description("Server port"))))
+                .addSecurityItem(new SecurityRequirement().addList("Bearer Authentication"))
+                .components(new Components()
+                        .addSecuritySchemes("Bearer Authentication", createAPIKeyScheme()));
+    }
+
+    private Info apiInfo() {
+        return new Info()
+                .title("AI Service API")
+                .description("AI 기반 시간별 상세 일정 생성 및 장소 추천 정보 API")
+                .version("1.0.0")
+                .contact(new Contact()
+                        .name("TripGen Development Team")
+                        .email("dev@tripgen.com"));
+    }
+
+    private SecurityScheme createAPIKeyScheme() {
+        return new SecurityScheme()
+                .type(SecurityScheme.Type.HTTP)
+                .bearerFormat("JWT")
+                .scheme("bearer");
+    }
+}
+```
diff --git a/claude/standard_comment.md b/claude/standard_comment.md
new file mode 100644
index 0000000..5200015
--- /dev/null
+++ b/claude/standard_comment.md
@@ -0,0 +1,518 @@
+# 개발주석표준 가이드
+
+## 📋 개요
+
+이 문서는 CMS 프로젝트의 JavaDoc 주석 작성 표준을 정의합니다. 일관된 주석 스타일을 통해 코드의 가독성과 유지보수성을 향상시키는 것을 목표로 합니다.
+
+## 🎯 주석 작성 원칙
+
+### 1. **기본 원칙**
+- **명확성**: 코드의 의도와 동작을 명확하게 설명
+- **일관성**: 프로젝트 전체에서 동일한 스타일 적용
+- **완전성**: 모든 public 메서드와 클래스에 주석 작성
+- **최신성**: 코드 변경 시 주석도 함께 업데이트
+
+### 2. **주석 대상**
+- **필수**: public 클래스, 인터페이스, 메서드
+- **권장**: protected 메서드, 중요한 필드
+- **선택**: private 메서드 (복잡한 로직인 경우)
+
+## 📝 JavaDoc 기본 문법
+
+### 1. **기본 구조**
+```java
+/**
+ * 클래스나 메서드의 간단한 설명 (첫 번째 문장)
+ * 
+ * <p>상세한 설명이 필요한 경우 여기에 작성합니다.</p>
+ * 
+ * @param paramName 파라미터 설명
+ * @return 반환값 설명
+ * @throws ExceptionType 예외 상황 설명
+ * @since 1.0
+ * @author 작성자명
+ * @see 관련클래스#메서드
+ */
+```
+
+### 2. **주요 JavaDoc 태그**
+
+| 태그 | 설명 | 사용 위치 |
+|------|------|-----------|
+| `@param` | 메서드 파라미터 설명 | 메서드 |
+| `@return` | 반환값 설명 | 메서드 |
+| `@throws` | 예외 상황 설명 | 메서드 |
+| `@since` | 도입 버전 | 클래스, 메서드 |
+| `@author` | 작성자 | 클래스 |
+| `@version` | 버전 정보 | 클래스 |
+| `@see` | 관련 항목 참조 | 모든 곳 |
+| `@apiNote` | API 사용 시 주의사항 | 메서드 |
+| `@implNote` | 구현 관련 참고사항 | 메서드 |
+
+## 🎨 HTML 태그 활용 가이드
+
+### 1. **HTML 태그 사용 이유**
+
+JavaDoc은 소스코드 주석을 파싱하여 **HTML 형태의 API 문서**를 자동 생성합니다. HTML 태그를 사용하면:
+
+- **가독성 향상**: 구조화된 문서로 이해하기 쉬움
+- **자동 문서화**: JavaDoc 도구가 예쁜 HTML 문서 생성
+- **IDE 지원**: 개발 도구에서 리치 텍스트로 표시
+- **표준 준수**: Oracle JavaDoc 스타일 가이드 준수
+
+### 2. **자주 사용되는 HTML 태그**
+
+#### **텍스트 서식**
+```java
+/**
+ * <p>단락을 구분할 때 사용합니다.</p>
+ * <b>중요한 내용</b>을 강조할 때 사용합니다.
+ * <i>이탤릭체</i>로 표시할 때 사용합니다.
+ * <code>method()</code>와 같은 코드를 표시할 때 사용합니다.
+ */
+```
+
+#### **목록 작성**
+```java
+/**
+ * <p><b>주요 기능:</b></p>
+ * <ul>
+ *   <li>첫 번째 기능</li>
+ *   <li>두 번째 기능</li>
+ *   <li>세 번째 기능</li>
+ * </ul>
+ * 
+ * <p><b>처리 과정:</b></p>
+ * <ol>
+ *   <li>첫 번째 단계</li>
+ *   <li>두 번째 단계</li>
+ *   <li>세 번째 단계</li>
+ * </ol>
+ */
+```
+
+#### **코드 블록**
+```java
+/**
+ * <p>사용 예시:</p>
+ * <pre>
+ * AuthController controller = new AuthController();
+ * LoginRequest request = new LoginRequest("user", "password");
+ * ResponseEntity&lt;LoginResponse&gt; response = controller.login(request);
+ * </pre>
+ */
+```
+
+#### **테이블**
+```java
+/**
+ * <p><b>HTTP 상태 코드:</b></p>
+ * <table>
+ *   <tr><th>상태 코드</th><th>설명</th></tr>
+ *   <tr><td>200</td><td>성공</td></tr>
+ *   <tr><td>400</td><td>잘못된 요청</td></tr>
+ *   <tr><td>401</td><td>인증 실패</td></tr>
+ * </table>
+ */
+```
+
+### 3. **HTML 태그 사용 규칙**
+
+- **&lt;와 &gt;**: 제네릭 타입 표현 시 `&lt;T&gt;` 사용
+- **줄바꿈**: `<br>` 태그 사용 (가급적 `<p>` 태그 권장)
+- **링크**: `{@link ClassName#methodName}` 사용
+- **인라인 코드**: `{@code variableName}` 또는 `<code>` 사용
+
+## 📋 클래스 주석 표준
+
+### 1. **클래스 주석 템플릿**
+```java
+/**
+ * 클래스의 간단한 설명
+ * 
+ * <p>클래스의 상세한 설명과 목적을 여기에 작성합니다.</p>
+ * 
+ * <p><b>주요 기능:</b></p>
+ * <ul>
+ *   <li>기능 1</li>
+ *   <li>기능 2</li>
+ *   <li>기능 3</li>
+ * </ul>
+ * 
+ * <p><b>사용 예시:</b></p>
+ * <pre>
+ * ClassName instance = new ClassName();
+ * instance.someMethod();
+ * </pre>
+ * 
+ * <p><b>주의사항:</b></p>
+ * <ul>
+ *   <li>주의사항 1</li>
+ *   <li>주의사항 2</li>
+ * </ul>
+ * 
+ * @author 작성자명
+ * @version 1.0
+ * @since 2024-01-01
+ * 
+ * @see 관련클래스1
+ * @see 관련클래스2
+ */
+public class ClassName {
+    // ...
+}
+```
+
+### 2. **Controller 클래스 주석 예시**
+```java
+/**
+ * 사용자 관리 API 컨트롤러
+ * 
+ * <p>사용자 등록, 조회, 수정, 삭제 기능을 제공하는 REST API 컨트롤러입니다.</p>
+ * 
+ * <p><b>주요 기능:</b></p>
+ * <ul>
+ *   <li>사용자 등록 및 인증</li>
+ *   <li>사용자 정보 조회 및 수정</li>
+ *   <li>사용자 권한 관리</li>
+ * </ul>
+ * 
+ * <p><b>API 엔드포인트:</b></p>
+ * <ul>
+ *   <li>POST /api/users - 사용자 등록</li>
+ *   <li>GET /api/users/{id} - 사용자 조회</li>
+ *   <li>PUT /api/users/{id} - 사용자 수정</li>
+ *   <li>DELETE /api/users/{id} - 사용자 삭제</li>
+ * </ul>
+ * 
+ * <p><b>보안 고려사항:</b></p>
+ * <ul>
+ *   <li>모든 엔드포인트는 인증이 필요합니다</li>
+ *   <li>개인정보 처리 시 데이터 마스킹 적용</li>
+ *   <li>입력값 검증 및 XSS 방지</li>
+ * </ul>
+ * 
+ * @author cms-team
+ * @version 1.0
+ * @since 2024-01-01
+ * 
+ * @see UserService
+ * @see UserRepository
+ * @see UserDTO
+ */
+@RestController
+@RequestMapping("/api/users")
+public class UserController {
+    // ...
+}
+```
+
+## 📋 메서드 주석 표준
+
+### 1. **메서드 주석 템플릿**
+```java
+/**
+ * 메서드의 간단한 설명
+ * 
+ * <p>메서드의 상세한 설명과 동작을 여기에 작성합니다.</p>
+ * 
+ * <p><b>처리 과정:</b></p>
+ * <ol>
+ *   <li>첫 번째 단계</li>
+ *   <li>두 번째 단계</li>
+ *   <li>세 번째 단계</li>
+ * </ol>
+ * 
+ * <p><b>주의사항:</b></p>
+ * <ul>
+ *   <li>주의사항 1</li>
+ *   <li>주의사항 2</li>
+ * </ul>
+ * 
+ * @param param1 첫 번째 파라미터 설명
+ *               - 추가 설명이 필요한 경우
+ * @param param2 두 번째 파라미터 설명
+ * 
+ * @return 반환값 설명
+ *         - 성공 시: 설명
+ *         - 실패 시: 설명
+ * 
+ * @throws ExceptionType1 예외 상황 1 설명
+ * @throws ExceptionType2 예외 상황 2 설명
+ * 
+ * @apiNote API 사용 시 주의사항
+ * 
+ * @see 관련메서드1
+ * @see 관련메서드2
+ * 
+ * @since 1.0
+ */
+public ReturnType methodName(Type param1, Type param2) {
+    // ...
+}
+```
+
+### 2. **API 메서드 주석 예시**
+```java
+/**
+ * 사용자 로그인 처리
+ * 
+ * <p>사용자 ID와 비밀번호를 검증하여 JWT 토큰을 생성합니다.</p>
+ * 
+ * <p><b>처리 과정:</b></p>
+ * <ol>
+ *   <li>입력값 검증 (@Valid 어노테이션)</li>
+ *   <li>사용자 인증 정보 확인</li>
+ *   <li>JWT 토큰 생성</li>
+ *   <li>사용자 세션 시작</li>
+ *   <li>로그인 메트릭 업데이트</li>
+ * </ol>
+ * 
+ * <p><b>보안 고려사항:</b></p>
+ * <ul>
+ *   <li>비밀번호는 BCrypt로 암호화된 값과 비교</li>
+ *   <li>로그인 실패 시 상세 정보 노출 방지</li>
+ *   <li>로그인 시도 로그 기록</li>
+ * </ul>
+ * 
+ * @param request 로그인 요청 정보
+ *                - username: 사용자 ID (3-50자, 필수)
+ *                - password: 비밀번호 (6-100자, 필수)
+ * 
+ * @return ResponseEntity&lt;LoginResponse&gt; 로그인 응답 정보
+ *         - 성공 시: 200 OK + JWT 토큰, 사용자 역할, 만료 시간
+ *         - 실패 시: 401 Unauthorized + 에러 메시지
+ * 
+ * @throws InvalidCredentialsException 인증 정보가 올바르지 않은 경우
+ * @throws RuntimeException 로그인 처리 중 시스템 오류 발생 시
+ * 
+ * @apiNote 보안상 이유로 로그인 실패 시 구체적인 실패 사유를 반환하지 않습니다.
+ * 
+ * @see AuthService#login(LoginRequest)
+ * @see UserSessionService#startSession(String, String, java.time.Instant)
+ * 
+ * @since 1.0
+ */
+@PostMapping("/login")
+public ResponseEntity<LoginResponse> login(@Valid @RequestBody LoginRequest request) {
+    // ...
+}
+```
+
+## 📋 필드 주석 표준
+
+### 1. **필드 주석 템플릿**
+```java
+/**
+ * 필드의 간단한 설명
+ * 
+ * <p>필드의 상세한 설명과 용도를 여기에 작성합니다.</p>
+ * 
+ * <p><b>주의사항:</b></p>
+ * <ul>
+ *   <li>주의사항 1</li>
+ *   <li>주의사항 2</li>
+ * </ul>
+ * 
+ * @since 1.0
+ */
+private final ServiceType serviceName;
+```
+
+### 2. **의존성 주입 필드 예시**
+```java
+/**
+ * 인증 서비스
+ * 
+ * <p>사용자 로그인/로그아웃 처리 및 JWT 토큰 관리를 담당합니다.</p>
+ * 
+ * <p><b>주요 기능:</b></p>
+ * <ul>
+ *   <li>사용자 인증 정보 검증</li>
+ *   <li>JWT 토큰 생성 및 검증</li>
+ *   <li>로그인/로그아웃 처리</li>
+ * </ul>
+ * 
+ * @see AuthService
+ * @since 1.0
+ */
+private final AuthService authService;
+```
+
+## 📋 예외 클래스 주석 표준
+
+```java
+/**
+ * 사용자 인증 실패 예외
+ * 
+ * <p>로그인 시 사용자 ID 또는 비밀번호가 올바르지 않을 때 발생하는 예외입니다.</p>
+ * 
+ * <p><b>발생 상황:</b></p>
+ * <ul>
+ *   <li>존재하지 않는 사용자 ID</li>
+ *   <li>잘못된 비밀번호</li>
+ *   <li>계정 잠금 상태</li>
+ * </ul>
+ * 
+ * <p><b>처리 방법:</b></p>
+ * <ul>
+ *   <li>사용자에게 일반적인 오류 메시지 표시</li>
+ *   <li>보안 로그에 상세 정보 기록</li>
+ *   <li>브루트 포스 공격 방지 로직 실행</li>
+ * </ul>
+ * 
+ * @author cms-team
+ * @version 1.0
+ * @since 2024-01-01
+ * 
+ * @see AuthService
+ * @see SecurityException
+ */
+public class InvalidCredentialsException extends RuntimeException {
+    // ...
+}
+```
+
+## 📋 인터페이스 주석 표준
+
+```java
+/**
+ * 사용자 인증 서비스 인터페이스
+ * 
+ * <p>사용자 로그인, 로그아웃, 토큰 관리 등 인증 관련 기능을 정의합니다.</p>
+ * 
+ * <p><b>구현 클래스:</b></p>
+ * <ul>
+ *   <li>{@link AuthServiceImpl} - 기본 구현체</li>
+ *   <li>{@link LdapAuthService} - LDAP 연동 구현체</li>
+ * </ul>
+ * 
+ * <p><b>주요 기능:</b></p>
+ * <ul>
+ *   <li>사용자 인증 및 토큰 생성</li>
+ *   <li>로그아웃 및 토큰 무효화</li>
+ *   <li>토큰 유효성 검증</li>
+ * </ul>
+ * 
+ * @author cms-team
+ * @version 1.0
+ * @since 2024-01-01
+ * 
+ * @see AuthServiceImpl
+ * @see TokenProvider
+ */
+public interface AuthService {
+    // ...
+}
+```
+
+## 📋 Enum 주석 표준
+
+```java
+/**
+ * 사용자 역할 열거형
+ * 
+ * <p>시스템 사용자의 권한 수준을 정의합니다.</p>
+ * 
+ * <p><b>권한 계층:</b></p>
+ * <ol>
+ *   <li>{@link #ADMIN} - 최고 관리자 권한</li>
+ *   <li>{@link #MANAGER} - 관리자 권한</li>
+ *   <li>{@link #USER} - 일반 사용자 권한</li>
+ * </ol>
+ * 
+ * @author cms-team
+ * @version 1.0
+ * @since 2024-01-01
+ */
+public enum Role {
+    
+    /**
+     * 시스템 관리자
+     * 
+     * <p>모든 시스템 기능에 대한 접근 권한을 가집니다.</p>
+     * 
+     * <p><b>주요 권한:</b></p>
+     * <ul>
+     *   <li>사용자 관리</li>
+     *   <li>시스템 설정</li>
+     *   <li>모든 데이터 접근</li>
+     * </ul>
+     */
+    ADMIN,
+    
+    /**
+     * 관리자
+     * 
+     * <p>제한된 관리 기능에 대한 접근 권한을 가집니다.</p>
+     */
+    MANAGER,
+    
+    /**
+     * 일반 사용자
+     * 
+     * <p>기본적인 시스템 기능에 대한 접근 권한을 가집니다.</p>
+     */
+    USER
+}
+```
+
+## 📋 주석 작성 체크리스트
+
+### ✅ **클래스 주석 체크리스트**
+- [ ] 클래스의 목적과 역할 명시
+- [ ] 주요 기능 목록 작성
+- [ ] 사용 예시 코드 포함
+- [ ] 주의사항 및 제약사항 명시
+- [ ] @author, @version, @since 태그 작성
+- [ ] 관련 클래스 @see 태그 추가
+
+### ✅ **메서드 주석 체크리스트**
+- [ ] 메서드의 목적과 동작 설명
+- [ ] 처리 과정 단계별 설명
+- [ ] 모든 @param 태그 작성
+- [ ] @return 태그 작성 (void 메서드 제외)
+- [ ] 가능한 예외 @throws 태그 작성
+- [ ] 보안 관련 주의사항 명시
+- [ ] 관련 메서드 @see 태그 추가
+
+### ✅ **HTML 태그 체크리스트**
+- [ ] 목록은 `<ul>`, `<ol>`, `<li>` 태그 사용
+- [ ] 강조는 `<b>` 태그 사용
+- [ ] 단락 구분은 `<p>` 태그 사용
+- [ ] 코드는 `<code>` 또는 `<pre>` 태그 사용
+- [ ] 제네릭 타입은 `&lt;`, `&gt;` 사용
+
+## 📋 도구 및 설정
+
+### 1. **JavaDoc 생성**
+```bash
+# Gradle 프로젝트
+./gradlew javadoc
+
+# Maven 프로젝트
+mvn javadoc:javadoc
+
+# 직접 실행
+javadoc -d docs -cp classpath src/**/*.java
+```
+
+### 2. **IDE 설정**
+- **IntelliJ IDEA**: Settings > Editor > Code Style > Java > JavaDoc
+- **Eclipse**: Window > Preferences > Java > Code Style > Code Templates
+- **VS Code**: Java Extension Pack + JavaDoc 플러그인
+
+### 3. **정적 분석 도구**
+- **Checkstyle**: JavaDoc 누락 검사
+- **SpotBugs**: 주석 품질 검사
+- **SonarQube**: 문서화 품질 메트릭
+
+## 📋 참고 자료
+
+- [Oracle JavaDoc 가이드](https://docs.oracle.com/javase/8/docs/technotes/tools/windows/javadoc.html)
+- [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)
+- [Spring Framework 주석 스타일](https://github.com/spring-projects/spring-framework/wiki/Code-Style)
+
+---
+
+> **💡 팁**: 이 가이드를 팀 내에서 공유하고, 코드 리뷰 시 주석 품질도 함께 검토하세요!
\ No newline at end of file
diff --git a/claude/standard_package_structure.md b/claude/standard_package_structure.md
new file mode 100644
index 0000000..81a4890
--- /dev/null
+++ b/claude/standard_package_structure.md
@@ -0,0 +1,173 @@
+패키지 구조 표준
+
+레이어드 아키텍처 패키지 구조
+
+├── {SERVICE}
+│   ├── domain
+│   ├── service
+│   ├── controller
+│   ├── dto
+│   ├── repository
+│   │   ├── jpa
+│   │   └── entity
+│   ├── config
+└── common
+        ├── dto
+        ├── util
+        ├── response
+        └── exception
+
+Package명: 
+- com.{ORG}.{ROOT}.{SERVICE}
+예) com.unicorn.lifesub.mysub, com.unicorn.lifesub.common
+
+변수: 
+- ORG: 회사 또는 조직명
+- ROOT: Root Project 명
+- SERVICE: 서비스명으로 Root Project의 서브 프로젝트임
+
+
+예시
+
+com.unicorn.lifesub.member
+ ├── MemberApplication.java
+ ├── controller
+ │   └── MemberController.java
+ ├── dto
+ │   ├── LoginRequest.java
+ │   ├── LogoutRequest.java
+ │   └── LogoutResponse.java  
+ ├── service
+ │   ├── MemberService.java
+ │   └── MemberServiceImpl.java
+ ├── domain
+ │   └── Member.java
+ ├── repository  
+ │   ├── entity
+ │   │   └── MemberEntity.java
+ │   └── jpa
+ │       └── MemberRepository.java
+ └── config
+     ├── SecurityConfig.java
+     ├── DataLoader.java
+     ├── SwaggerConfig.java
+     └── jwt
+         ├── JwtAuthenticationFilter.java
+         ├── JwtTokenProvider.java
+         └── CustomUserDetailsService.java
+
+
+클린 아키텍처 패키지 구조 
+
+├── biz
+│   ├── usecase
+│   │   ├── in
+│   │   ├── out
+│   ├── service
+│   └── domain
+│   └── dto
+├── infra
+│   ├── controller
+│   ├── dto
+│   ├── gateway
+│   │   ├── repository
+│   │   └── entity
+│   └── config    
+
+
+Package명: 
+- com.{ORG}.{ROOT}.{SERVICE}.biz
+- com.{ORG}.{ROOT}.{SERVICE}.infra
+예) com.unicorn.lifesub.mysub.biz, com.unicorn.lifesub.common
+
+변수: 
+- ORG: 회사 또는 조직명
+- ROOT: Root Project 명
+- SERVICE: 서비스명으로 Root Project의 서브 프로젝트임
+
+예시
+
+
+com.unicorn.lifesub.mysub
+ ├── biz
+ │   ├── dto
+ │   │   ├── CategoryResponse.java
+ │   │   ├── ServiceListResponse.java
+ │   │   ├── MySubResponse.java
+ │   │   ├── SubDetailResponse.java
+ │   │   └── TotalFeeResponse.java
+ │   ├── service
+ │   │   ├── FeeLevel.java
+ │   │   └── MySubscriptionService.java
+ │   ├── usecase
+ │   │   ├── in
+ │   │   │   ├── CancelSubscriptionUseCase.java
+ │   │   │   ├── CategoryUseCase.java
+ │   │   │   ├── MySubscriptionsUseCase.java
+ │   │   │   ├── SubscribeUseCase.java
+ │   │   │   ├── SubscriptionDetailUseCase.java
+ │   │   │   └── TotalFeeUseCase.java
+ │   │   └── out 
+ │   │       ├── MySubscriptionReader.java
+ │   │       ├── MySubscriptionWriter.java
+ │   │       └── SubscriptionReader.java
+ │   └── domain
+ │       ├── Category.java
+ │       ├── MySubscription.java
+ │       └── Subscription.java
+ └── infra  
+     ├── MySubApplication.java 
+     ├── controller
+     │   ├── CategoryController.java
+     │   ├── MySubController.java
+     │   └── ServiceController.java
+     ├── config
+     │   ├── DataLoader.java
+     │   ├── SecurityConfig.java
+     │   ├── SwaggerConfig.java
+     │   └── jwt
+     │       ├── JwtAuthenticationFilter.java
+     │       └── JwtTokenProvider.java
+     └── gateway
+         ├── entity
+         │   ├── CategoryEntity.java   
+         │   ├── MySubscriptionEntity.java
+         │   └── SubscriptionEntity.java
+         ├── repository
+         │   ├── CategoryJpaRepository.java
+         │   ├── MySubscriptionJpaRepository.java
+         │   └── SubscriptionJpaRepository.java  
+         ├── MySubscriptionGateway.java
+         └── SubscriptionGateway.java
+
+
+---
+
+common 모듈 패키지 구조
+
+├── common
+    ├── dto
+    ├── entity
+    ├── config
+    ├── util
+    └── exception
+
+
+com.unicorn.lifesub.common
+ ├── dto
+ │   ├── ApiResponse.java
+ │   ├── JwtTokenDTO.java
+ │   ├── JwtTokenRefreshDTO.java
+ │   └── JwtTokenVerifyDTO.java
+ ├── config
+ │   └── JpaConfig.java
+ ├── entity
+ │   └── BaseTimeEntity.java        
+ ├── aop  
+ │   └── LoggingAspect.java
+ └── exception
+     ├── ErrorCode.java
+     ├── InfraException.java
+     └── BusinessException.java
+
+
diff --git a/common/build.gradle b/common/build.gradle
new file mode 100644
index 0000000..22c4adf
--- /dev/null
+++ b/common/build.gradle
@@ -0,0 +1,32 @@
+plugins {
+    id 'java-library'
+    id 'org.springframework.boot'
+}
+
+bootJar {
+    enabled = false
+}
+
+jar {
+    enabled = true
+}
+
+dependencies {
+    // Spring Boot
+    api 'org.springframework.boot:spring-boot-starter-web'
+    api 'org.springframework.boot:spring-boot-starter-data-jpa'
+    api 'org.springframework.boot:spring-boot-starter-security'
+    api 'org.springframework.boot:spring-boot-starter-validation'
+    api 'org.springframework.boot:spring-boot-starter-aop'
+
+    // JWT
+    api "io.jsonwebtoken:jjwt-api:${jjwtVersion}"
+
+    // Utilities
+    api "org.apache.commons:commons-lang3:${commonsLang3Version}"
+    api "commons-io:commons-io:${commonsIoVersion}"
+
+    // Jackson
+    api 'com.fasterxml.jackson.core:jackson-databind'
+    api 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/aop/LoggingAspect.java b/common/src/main/java/com/unicorn/hgzero/common/aop/LoggingAspect.java
new file mode 100644
index 0000000..32a6669
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/aop/LoggingAspect.java
@@ -0,0 +1,98 @@
+package com.unicorn.hgzero.common.aop;
+
+import lombok.extern.slf4j.Slf4j;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+import org.springframework.stereotype.Component;
+
+import java.util.Arrays;
+
+/**
+ * 로깅 AOP
+ * Controller, Service 메서드 실행 시 로그를 자동으로 기록
+ */
+@Slf4j
+@Aspect
+@Component
+public class LoggingAspect {
+
+    /**
+     * Controller 메서드 포인트컷
+     */
+    @Pointcut("within(@org.springframework.web.bind.annotation.RestController *)")
+    public void controllerPointcut() {
+        // Pointcut for all methods in @RestController classes
+    }
+
+    /**
+     * Service 메서드 포인트컷
+     */
+    @Pointcut("within(@org.springframework.stereotype.Service *)")
+    public void servicePointcut() {
+        // Pointcut for all methods in @Service classes
+    }
+
+    /**
+     * Controller 메서드 실행 로깅
+     *
+     * @param joinPoint 조인 포인트
+     * @return 메서드 실행 결과
+     * @throws Throwable 예외 발생 시
+     */
+    @Around("controllerPointcut()")
+    public Object logController(ProceedingJoinPoint joinPoint) throws Throwable {
+        String className = joinPoint.getSignature().getDeclaringTypeName();
+        String methodName = joinPoint.getSignature().getName();
+        Object[] args = joinPoint.getArgs();
+
+        log.info("[Controller] {}.{} 호출 - 파라미터: {}",
+                className, methodName, Arrays.toString(args));
+
+        long startTime = System.currentTimeMillis();
+        Object result = null;
+        try {
+            result = joinPoint.proceed();
+            long executionTime = System.currentTimeMillis() - startTime;
+            log.info("[Controller] {}.{} 완료 - 실행시간: {}ms",
+                    className, methodName, executionTime);
+            return result;
+        } catch (Exception e) {
+            long executionTime = System.currentTimeMillis() - startTime;
+            log.error("[Controller] {}.{} 실패 - 실행시간: {}ms, 에러: {}",
+                    className, methodName, executionTime, e.getMessage());
+            throw e;
+        }
+    }
+
+    /**
+     * Service 메서드 실행 로깅
+     *
+     * @param joinPoint 조인 포인트
+     * @return 메서드 실행 결과
+     * @throws Throwable 예외 발생 시
+     */
+    @Around("servicePointcut()")
+    public Object logService(ProceedingJoinPoint joinPoint) throws Throwable {
+        String className = joinPoint.getSignature().getDeclaringTypeName();
+        String methodName = joinPoint.getSignature().getName();
+
+        log.debug("[Service] {}.{} 시작", className, methodName);
+
+        long startTime = System.currentTimeMillis();
+        Object result = null;
+        try {
+            result = joinPoint.proceed();
+            long executionTime = System.currentTimeMillis() - startTime;
+            log.debug("[Service] {}.{} 완료 - 실행시간: {}ms",
+                    className, methodName, executionTime);
+            return result;
+        } catch (Exception e) {
+            long executionTime = System.currentTimeMillis() - startTime;
+            log.error("[Service] {}.{} 실패 - 실행시간: {}ms, 에러: {}",
+                    className, methodName, executionTime, e.getMessage());
+            throw e;
+        }
+    }
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/config/JpaConfig.java b/common/src/main/java/com/unicorn/hgzero/common/config/JpaConfig.java
new file mode 100644
index 0000000..8b86c06
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/config/JpaConfig.java
@@ -0,0 +1,15 @@
+package com.unicorn.hgzero.common.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+/**
+ * JPA 설정
+ * JPA Auditing 기능을 활성화하여 엔티티의 생성일시, 수정일시를 자동으로 관리
+ */
+@Configuration
+@EnableJpaAuditing
+public class JpaConfig {
+    // JPA Auditing 활성화
+    // BaseTimeEntity의 @CreatedDate, @LastModifiedDate가 자동으로 동작
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/dto/ApiResponse.java b/common/src/main/java/com/unicorn/hgzero/common/dto/ApiResponse.java
new file mode 100644
index 0000000..66edd80
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/dto/ApiResponse.java
@@ -0,0 +1,120 @@
+package com.unicorn.hgzero.common.dto;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+/**
+ * API 응답 공통 포맷
+ * 모든 API 응답에 사용되는 표준 응답 형식
+ *
+ * @param <T> 응답 데이터 타입
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class ApiResponse<T> {
+
+    /**
+     * 응답 상태 (success, error)
+     */
+    private String status;
+
+    /**
+     * 응답 메시지
+     */
+    private String message;
+
+    /**
+     * 응답 데이터
+     */
+    private T data;
+
+    /**
+     * 에러 코드 (에러 발생 시)
+     */
+    private String code;
+
+    /**
+     * 에러 상세 정보 (에러 발생 시)
+     */
+    private Object details;
+
+    /**
+     * 응답 타임스탬프
+     */
+    @Builder.Default
+    private LocalDateTime timestamp = LocalDateTime.now();
+
+    /**
+     * 성공 응답 생성
+     *
+     * @param <T> 응답 데이터 타입
+     * @param data 응답 데이터
+     * @return 성공 응답
+     */
+    public static <T> ApiResponse<T> success(T data) {
+        return ApiResponse.<T>builder()
+                .status("success")
+                .data(data)
+                .timestamp(LocalDateTime.now())
+                .build();
+    }
+
+    /**
+     * 성공 응답 생성 (메시지 포함)
+     *
+     * @param <T> 응답 데이터 타입
+     * @param message 성공 메시지
+     * @param data 응답 데이터
+     * @return 성공 응답
+     */
+    public static <T> ApiResponse<T> success(String message, T data) {
+        return ApiResponse.<T>builder()
+                .status("success")
+                .message(message)
+                .data(data)
+                .timestamp(LocalDateTime.now())
+                .build();
+    }
+
+    /**
+     * 에러 응답 생성
+     *
+     * @param code 에러 코드
+     * @param message 에러 메시지
+     * @return 에러 응답
+     */
+    public static ApiResponse<Void> error(String code, String message) {
+        return ApiResponse.<Void>builder()
+                .status("error")
+                .code(code)
+                .message(message)
+                .timestamp(LocalDateTime.now())
+                .build();
+    }
+
+    /**
+     * 에러 응답 생성 (상세 정보 포함)
+     *
+     * @param code 에러 코드
+     * @param message 에러 메시지
+     * @param details 에러 상세 정보
+     * @return 에러 응답
+     */
+    public static ApiResponse<Void> error(String code, String message, Object details) {
+        return ApiResponse.<Void>builder()
+                .status("error")
+                .code(code)
+                .message(message)
+                .details(details)
+                .timestamp(LocalDateTime.now())
+                .build();
+    }
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenDTO.java b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenDTO.java
new file mode 100644
index 0000000..8a3cf92
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenDTO.java
@@ -0,0 +1,45 @@
+package com.unicorn.hgzero.common.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * JWT 토큰 DTO
+ * Access Token과 Refresh Token을 함께 반환하는 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class JwtTokenDTO {
+
+    /**
+     * Access Token
+     * 단기 인증 토큰 (기본 1시간)
+     */
+    private String accessToken;
+
+    /**
+     * Refresh Token
+     * 장기 인증 토큰 (기본 7일)
+     */
+    private String refreshToken;
+
+    /**
+     * Access Token 유효 기간 (초)
+     */
+    private Long accessTokenValidity;
+
+    /**
+     * Refresh Token 유효 기간 (초)
+     */
+    private Long refreshTokenValidity;
+
+    /**
+     * 토큰 타입 (Bearer)
+     */
+    @Builder.Default
+    private String tokenType = "Bearer";
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenRefreshDTO.java b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenRefreshDTO.java
new file mode 100644
index 0000000..e82ae79
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenRefreshDTO.java
@@ -0,0 +1,38 @@
+package com.unicorn.hgzero.common.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * JWT Token 갱신 요청/응답 DTO
+ * Refresh Token을 사용하여 새로운 Access Token을 발급받을 때 사용
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class JwtTokenRefreshDTO {
+
+    /**
+     * Refresh Token
+     */
+    private String refreshToken;
+
+    /**
+     * 새로 발급된 Access Token
+     */
+    private String accessToken;
+
+    /**
+     * Access Token 유효 기간 (초)
+     */
+    private Long accessTokenValidity;
+
+    /**
+     * 토큰 타입 (Bearer)
+     */
+    @Builder.Default
+    private String tokenType = "Bearer";
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenVerifyDTO.java b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenVerifyDTO.java
new file mode 100644
index 0000000..af186d9
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/dto/JwtTokenVerifyDTO.java
@@ -0,0 +1,47 @@
+package com.unicorn.hgzero.common.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * JWT Token 검증 결과 DTO
+ * 토큰 유효성 검증 결과를 반환하는 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class JwtTokenVerifyDTO {
+
+    /**
+     * 토큰 유효 여부
+     */
+    private Boolean valid;
+
+    /**
+     * 사용자 ID
+     */
+    private String userId;
+
+    /**
+     * 사용자 이름
+     */
+    private String username;
+
+    /**
+     * 권한
+     */
+    private String authority;
+
+    /**
+     * 토큰 만료 여부
+     */
+    private Boolean expired;
+
+    /**
+     * 에러 메시지 (유효하지 않은 경우)
+     */
+    private String errorMessage;
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/entity/BaseTimeEntity.java b/common/src/main/java/com/unicorn/hgzero/common/entity/BaseTimeEntity.java
new file mode 100644
index 0000000..41d77ca
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/entity/BaseTimeEntity.java
@@ -0,0 +1,37 @@
+package com.unicorn.hgzero.common.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+/**
+ * 생성일시/수정일시 자동 관리 Entity
+ * 모든 Entity의 기본 클래스로 사용되며, 생성일시와 수정일시를 자동으로 관리
+ */
+@Getter
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener.class)
+public abstract class BaseTimeEntity {
+
+    /**
+     * 생성일시
+     * Entity가 처음 생성될 때 자동으로 설정
+     */
+    @CreatedDate
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    /**
+     * 수정일시
+     * Entity가 수정될 때마다 자동으로 갱신
+     */
+    @LastModifiedDate
+    @Column(name = "updated_at", nullable = false)
+    private LocalDateTime updatedAt;
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/exception/BusinessException.java b/common/src/main/java/com/unicorn/hgzero/common/exception/BusinessException.java
new file mode 100644
index 0000000..53cef66
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/exception/BusinessException.java
@@ -0,0 +1,69 @@
+package com.unicorn.hgzero.common.exception;
+
+import lombok.Getter;
+
+/**
+ * 비즈니스 로직 예외
+ * 비즈니스 규칙 위반 또는 비즈니스 로직 처리 중 발생하는 예외
+ */
+@Getter
+public class BusinessException extends RuntimeException {
+
+    /**
+     * 에러 코드
+     */
+    private final ErrorCode errorCode;
+
+    /**
+     * 에러 상세 정보
+     */
+    private final Object details;
+
+    /**
+     * 비즈니스 예외 생성
+     *
+     * @param errorCode 에러 코드
+     */
+    public BusinessException(ErrorCode errorCode) {
+        super(errorCode.getMessage());
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+
+    /**
+     * 비즈니스 예외 생성 (메시지 커스터마이징)
+     *
+     * @param errorCode 에러 코드
+     * @param message 커스텀 메시지
+     */
+    public BusinessException(ErrorCode errorCode, String message) {
+        super(message);
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+
+    /**
+     * 비즈니스 예외 생성 (상세 정보 포함)
+     *
+     * @param errorCode 에러 코드
+     * @param message 커스텀 메시지
+     * @param details 에러 상세 정보
+     */
+    public BusinessException(ErrorCode errorCode, String message, Object details) {
+        super(message);
+        this.errorCode = errorCode;
+        this.details = details;
+    }
+
+    /**
+     * 비즈니스 예외 생성 (원인 예외 포함)
+     *
+     * @param errorCode 에러 코드
+     * @param cause 원인 예외
+     */
+    public BusinessException(ErrorCode errorCode, Throwable cause) {
+        super(errorCode.getMessage(), cause);
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/exception/ErrorCode.java b/common/src/main/java/com/unicorn/hgzero/common/exception/ErrorCode.java
new file mode 100644
index 0000000..621e4bc
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/exception/ErrorCode.java
@@ -0,0 +1,60 @@
+package com.unicorn.hgzero.common.exception;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+
+/**
+ * 에러 코드 정의
+ * 시스템 전체에서 사용되는 표준 에러 코드
+ */
+@Getter
+@RequiredArgsConstructor
+public enum ErrorCode {
+
+    // 공통 에러 (1xxx)
+    INVALID_INPUT_VALUE(HttpStatus.BAD_REQUEST, "C001", "잘못된 입력 값입니다."),
+    METHOD_NOT_ALLOWED(HttpStatus.METHOD_NOT_ALLOWED, "C002", "허용되지 않은 HTTP 메서드입니다."),
+    ENTITY_NOT_FOUND(HttpStatus.NOT_FOUND, "C003", "요청한 리소스를 찾을 수 없습니다."),
+    INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "C004", "서버 내부 오류가 발생했습니다."),
+    INVALID_TYPE_VALUE(HttpStatus.BAD_REQUEST, "C005", "잘못된 타입의 값입니다."),
+    ACCESS_DENIED(HttpStatus.FORBIDDEN, "C006", "접근 권한이 없습니다."),
+
+    // 인증/인가 에러 (2xxx)
+    AUTHENTICATION_FAILED(HttpStatus.UNAUTHORIZED, "A001", "인증에 실패했습니다."),
+    INVALID_TOKEN(HttpStatus.UNAUTHORIZED, "A002", "유효하지 않은 토큰입니다."),
+    EXPIRED_TOKEN(HttpStatus.UNAUTHORIZED, "A003", "만료된 토큰입니다."),
+    REFRESH_TOKEN_NOT_FOUND(HttpStatus.UNAUTHORIZED, "A004", "Refresh Token을 찾을 수 없습니다."),
+    INVALID_REFRESH_TOKEN(HttpStatus.UNAUTHORIZED, "A005", "유효하지 않은 Refresh Token입니다."),
+    ACCOUNT_LOCKED(HttpStatus.UNAUTHORIZED, "A006", "계정이 잠금 상태입니다."),
+    UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "A007", "인증이 필요합니다."),
+
+    // 비즈니스 로직 에러 (3xxx)
+    DUPLICATE_RESOURCE(HttpStatus.CONFLICT, "B001", "이미 존재하는 리소스입니다."),
+    INVALID_STATUS_TRANSITION(HttpStatus.BAD_REQUEST, "B002", "유효하지 않은 상태 전환입니다."),
+    RESOURCE_CONFLICT(HttpStatus.CONFLICT, "B003", "리소스 충돌이 발생했습니다."),
+    OPERATION_NOT_ALLOWED(HttpStatus.BAD_REQUEST, "B004", "허용되지 않은 작업입니다."),
+    BUSINESS_RULE_VIOLATION(HttpStatus.BAD_REQUEST, "B005", "비즈니스 규칙 위반입니다."),
+
+    // 외부 시스템 에러 (4xxx)
+    EXTERNAL_API_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "E001", "외부 API 호출 중 오류가 발생했습니다."),
+    DATABASE_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "E002", "데이터베이스 오류가 발생했습니다."),
+    CACHE_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "E003", "캐시 오류가 발생했습니다."),
+    MESSAGE_QUEUE_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "E004", "메시지 큐 오류가 발생했습니다."),
+    STORAGE_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "E005", "스토리지 오류가 발생했습니다.");
+
+    /**
+     * HTTP 상태 코드
+     */
+    private final HttpStatus httpStatus;
+
+    /**
+     * 에러 코드
+     */
+    private final String code;
+
+    /**
+     * 에러 메시지
+     */
+    private final String message;
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/exception/InfraException.java b/common/src/main/java/com/unicorn/hgzero/common/exception/InfraException.java
new file mode 100644
index 0000000..1e39c1c
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/exception/InfraException.java
@@ -0,0 +1,69 @@
+package com.unicorn.hgzero.common.exception;
+
+import lombok.Getter;
+
+/**
+ * 인프라스트럭처 예외
+ * 외부 시스템(데이터베이스, 캐시, 메시지 큐, 스토리지 등) 연동 중 발생하는 예외
+ */
+@Getter
+public class InfraException extends RuntimeException {
+
+    /**
+     * 에러 코드
+     */
+    private final ErrorCode errorCode;
+
+    /**
+     * 에러 상세 정보
+     */
+    private final Object details;
+
+    /**
+     * 인프라 예외 생성
+     *
+     * @param errorCode 에러 코드
+     */
+    public InfraException(ErrorCode errorCode) {
+        super(errorCode.getMessage());
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+
+    /**
+     * 인프라 예외 생성 (메시지 커스터마이징)
+     *
+     * @param errorCode 에러 코드
+     * @param message 커스텀 메시지
+     */
+    public InfraException(ErrorCode errorCode, String message) {
+        super(message);
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+
+    /**
+     * 인프라 예외 생성 (상세 정보 포함)
+     *
+     * @param errorCode 에러 코드
+     * @param message 커스텀 메시지
+     * @param details 에러 상세 정보
+     */
+    public InfraException(ErrorCode errorCode, String message, Object details) {
+        super(message);
+        this.errorCode = errorCode;
+        this.details = details;
+    }
+
+    /**
+     * 인프라 예외 생성 (원인 예외 포함)
+     *
+     * @param errorCode 에러 코드
+     * @param cause 원인 예외
+     */
+    public InfraException(ErrorCode errorCode, Throwable cause) {
+        super(errorCode.getMessage(), cause);
+        this.errorCode = errorCode;
+        this.details = null;
+    }
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/util/DateUtil.java b/common/src/main/java/com/unicorn/hgzero/common/util/DateUtil.java
new file mode 100644
index 0000000..1a411e5
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/util/DateUtil.java
@@ -0,0 +1,134 @@
+package com.unicorn.hgzero.common.util;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoUnit;
+
+/**
+ * 날짜/시간 유틸리티 클래스
+ * 날짜와 시간 관련 공통 기능을 제공
+ */
+public class DateUtil {
+
+    /**
+     * 기본 날짜 포맷 (yyyy-MM-dd)
+     */
+    public static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
+
+    /**
+     * 기본 날짜시간 포맷 (yyyy-MM-dd HH:mm:ss)
+     */
+    public static final DateTimeFormatter DATETIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+    /**
+     * ISO 8601 날짜시간 포맷 (yyyy-MM-dd'T'HH:mm:ss)
+     */
+    public static final DateTimeFormatter ISO_DATETIME_FORMATTER = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
+
+    private DateUtil() {
+        // Utility class - prevent instantiation
+    }
+
+    /**
+     * LocalDate를 문자열로 변환
+     *
+     * @param date 변환할 날짜
+     * @return 포맷된 날짜 문자열 (yyyy-MM-dd)
+     */
+    public static String format(LocalDate date) {
+        return date != null ? date.format(DATE_FORMATTER) : null;
+    }
+
+    /**
+     * LocalDateTime을 문자열로 변환
+     *
+     * @param dateTime 변환할 날짜시간
+     * @return 포맷된 날짜시간 문자열 (yyyy-MM-dd HH:mm:ss)
+     */
+    public static String format(LocalDateTime dateTime) {
+        return dateTime != null ? dateTime.format(DATETIME_FORMATTER) : null;
+    }
+
+    /**
+     * LocalDateTime을 커스텀 포맷으로 변환
+     *
+     * @param dateTime 변환할 날짜시간
+     * @param formatter 날짜시간 포맷터
+     * @return 포맷된 날짜시간 문자열
+     */
+    public static String format(LocalDateTime dateTime, DateTimeFormatter formatter) {
+        return dateTime != null ? dateTime.format(formatter) : null;
+    }
+
+    /**
+     * 문자열을 LocalDate로 변환
+     *
+     * @param dateString 날짜 문자열 (yyyy-MM-dd)
+     * @return LocalDate 객체
+     */
+    public static LocalDate parseDate(String dateString) {
+        return dateString != null ? LocalDate.parse(dateString, DATE_FORMATTER) : null;
+    }
+
+    /**
+     * 문자열을 LocalDateTime으로 변환
+     *
+     * @param dateTimeString 날짜시간 문자열 (yyyy-MM-dd HH:mm:ss)
+     * @return LocalDateTime 객체
+     */
+    public static LocalDateTime parseDateTime(String dateTimeString) {
+        return dateTimeString != null ? LocalDateTime.parse(dateTimeString, DATETIME_FORMATTER) : null;
+    }
+
+    /**
+     * 두 날짜 사이의 일수 계산
+     *
+     * @param startDate 시작 날짜
+     * @param endDate 종료 날짜
+     * @return 일수 차이
+     */
+    public static long daysBetween(LocalDate startDate, LocalDate endDate) {
+        return ChronoUnit.DAYS.between(startDate, endDate);
+    }
+
+    /**
+     * 두 날짜시간 사이의 시간 계산 (시간 단위)
+     *
+     * @param startDateTime 시작 날짜시간
+     * @param endDateTime 종료 날짜시간
+     * @return 시간 차이
+     */
+    public static long hoursBetween(LocalDateTime startDateTime, LocalDateTime endDateTime) {
+        return ChronoUnit.HOURS.between(startDateTime, endDateTime);
+    }
+
+    /**
+     * 두 날짜시간 사이의 시간 계산 (분 단위)
+     *
+     * @param startDateTime 시작 날짜시간
+     * @param endDateTime 종료 날짜시간
+     * @return 분 차이
+     */
+    public static long minutesBetween(LocalDateTime startDateTime, LocalDateTime endDateTime) {
+        return ChronoUnit.MINUTES.between(startDateTime, endDateTime);
+    }
+
+    /**
+     * 현재 날짜 반환
+     *
+     * @return 현재 날짜
+     */
+    public static LocalDate now() {
+        return LocalDate.now();
+    }
+
+    /**
+     * 현재 날짜시간 반환
+     *
+     * @return 현재 날짜시간
+     */
+    public static LocalDateTime nowDateTime() {
+        return LocalDateTime.now();
+    }
+}
diff --git a/common/src/main/java/com/unicorn/hgzero/common/util/StringUtil.java b/common/src/main/java/com/unicorn/hgzero/common/util/StringUtil.java
new file mode 100644
index 0000000..d28ba20
--- /dev/null
+++ b/common/src/main/java/com/unicorn/hgzero/common/util/StringUtil.java
@@ -0,0 +1,197 @@
+package com.unicorn.hgzero.common.util;
+
+import org.springframework.util.StringUtils;
+
+/**
+ * 문자열 유틸리티 클래스
+ * 문자열 관련 공통 기능을 제공
+ */
+public class StringUtil {
+
+    private StringUtil() {
+        // Utility class - prevent instantiation
+    }
+
+    /**
+     * 문자열이 비어있는지 확인
+     *
+     * @param str 확인할 문자열
+     * @return 비어있으면 true, 아니면 false
+     */
+    public static boolean isEmpty(String str) {
+        return !StringUtils.hasText(str);
+    }
+
+    /**
+     * 문자열이 비어있지 않은지 확인
+     *
+     * @param str 확인할 문자열
+     * @return 비어있지 않으면 true, 아니면 false
+     */
+    public static boolean isNotEmpty(String str) {
+        return StringUtils.hasText(str);
+    }
+
+    /**
+     * 문자열 앞뒤 공백 제거
+     * null-safe 처리
+     *
+     * @param str 입력 문자열
+     * @return 공백이 제거된 문자열 (null인 경우 null 반환)
+     */
+    public static String trim(String str) {
+        return str != null ? str.trim() : null;
+    }
+
+    /**
+     * 문자열 앞뒤 공백 제거
+     * null인 경우 빈 문자열 반환
+     *
+     * @param str 입력 문자열
+     * @return 공백이 제거된 문자열 (null인 경우 빈 문자열 반환)
+     */
+    public static String trimToEmpty(String str) {
+        return str != null ? str.trim() : "";
+    }
+
+    /**
+     * 문자열이 null 또는 빈 문자열인 경우 기본값 반환
+     *
+     * @param str 입력 문자열
+     * @param defaultValue 기본값
+     * @return 문자열이 비어있으면 기본값, 아니면 입력 문자열
+     */
+    public static String defaultIfEmpty(String str, String defaultValue) {
+        return isEmpty(str) ? defaultValue : str;
+    }
+
+    /**
+     * 문자열 마스킹
+     * 이메일, 전화번호 등 민감한 정보를 부분적으로 마스킹
+     *
+     * @param str 마스킹할 문자열
+     * @param visibleStart 앞에서 보일 문자 수
+     * @param visibleEnd 뒤에서 보일 문자 수
+     * @param maskChar 마스킹 문자
+     * @return 마스킹된 문자열
+     */
+    public static String mask(String str, int visibleStart, int visibleEnd, char maskChar) {
+        if (isEmpty(str) || str.length() <= (visibleStart + visibleEnd)) {
+            return str;
+        }
+
+        int maskLength = str.length() - visibleStart - visibleEnd;
+        String maskedPart = String.valueOf(maskChar).repeat(maskLength);
+
+        return str.substring(0, visibleStart) +
+               maskedPart +
+               str.substring(str.length() - visibleEnd);
+    }
+
+    /**
+     * 이메일 마스킹
+     * 예: test@example.com -> te**@example.com
+     *
+     * @param email 마스킹할 이메일
+     * @return 마스킹된 이메일
+     */
+    public static String maskEmail(String email) {
+        if (isEmpty(email) || !email.contains("@")) {
+            return email;
+        }
+
+        String[] parts = email.split("@");
+        String localPart = parts[0];
+        String domain = parts[1];
+
+        if (localPart.length() <= 2) {
+            return localPart + "@" + domain;
+        }
+
+        String maskedLocal = localPart.substring(0, 2) +
+                            "*".repeat(localPart.length() - 2);
+
+        return maskedLocal + "@" + domain;
+    }
+
+    /**
+     * 전화번호 마스킹
+     * 예: 010-1234-5678 -> 010-****-5678
+     *
+     * @param phone 마스킹할 전화번호
+     * @return 마스킹된 전화번호
+     */
+    public static String maskPhone(String phone) {
+        if (isEmpty(phone)) {
+            return phone;
+        }
+
+        // 하이픈 제거
+        String cleanPhone = phone.replaceAll("-", "");
+
+        if (cleanPhone.length() < 8) {
+            return phone;
+        }
+
+        // 뒤 4자리만 보이도록 마스킹
+        String masked = "*".repeat(cleanPhone.length() - 4) +
+                       cleanPhone.substring(cleanPhone.length() - 4);
+
+        // 원본 형식에 따라 하이픈 추가
+        if (phone.contains("-")) {
+            if (cleanPhone.length() == 10) {
+                return masked.substring(0, 3) + "-" +
+                      masked.substring(3, 6) + "-" +
+                      masked.substring(6);
+            } else if (cleanPhone.length() == 11) {
+                return masked.substring(0, 3) + "-" +
+                      masked.substring(3, 7) + "-" +
+                      masked.substring(7);
+            }
+        }
+
+        return masked;
+    }
+
+    /**
+     * Camel Case를 Snake Case로 변환
+     * 예: userName -> user_name
+     *
+     * @param camelCase Camel Case 문자열
+     * @return Snake Case 문자열
+     */
+    public static String toSnakeCase(String camelCase) {
+        if (isEmpty(camelCase)) {
+            return camelCase;
+        }
+
+        return camelCase.replaceAll("([a-z])([A-Z])", "$1_$2").toLowerCase();
+    }
+
+    /**
+     * Snake Case를 Camel Case로 변환
+     * 예: user_name -> userName
+     *
+     * @param snakeCase Snake Case 문자열
+     * @return Camel Case 문자열
+     */
+    public static String toCamelCase(String snakeCase) {
+        if (isEmpty(snakeCase)) {
+            return snakeCase;
+        }
+
+        StringBuilder result = new StringBuilder();
+        boolean nextUpper = false;
+
+        for (char c : snakeCase.toCharArray()) {
+            if (c == '_') {
+                nextUpper = true;
+            } else {
+                result.append(nextUpper ? Character.toUpperCase(c) : c);
+                nextUpper = false;
+            }
+        }
+
+        return result.toString();
+    }
+}
diff --git a/develop/dev/package-structure.md b/develop/dev/package-structure.md
new file mode 100644
index 0000000..fa4a9c8
--- /dev/null
+++ b/develop/dev/package-structure.md
@@ -0,0 +1,419 @@
+# 패키지 구조도
+
+## 전체 프로젝트 구조
+
+```
+HGZero/
+├── common/                          # 공통 모듈
+├── user/                           # User Service (Layered)
+├── meeting/                        # Meeting Service (Clean)
+├── stt/                           # STT Service (Layered)
+├── ai/                            # AI Service (Clean)
+├── notification/                  # Notification Service (Layered)
+├── settings.gradle                # Gradle 설정
+└── build.gradle                   # 루트 build.gradle
+```
+
+## 1. Common 모듈
+
+```
+common/
+└── src/main/java/com/unicorn/hgzero/common/
+    ├── dto/
+    │   ├── ApiResponse.java
+    │   ├── JwtTokenDTO.java
+    │   ├── JwtTokenRefreshDTO.java
+    │   └── JwtTokenVerifyDTO.java
+    ├── entity/
+    │   └── BaseTimeEntity.java
+    ├── config/
+    │   └── JpaConfig.java
+    ├── util/
+    │   ├── DateUtil.java
+    │   └── StringUtil.java
+    ├── aop/
+    │   └── LoggingAspect.java
+    └── exception/
+        ├── ErrorCode.java
+        ├── BusinessException.java
+        └── InfraException.java
+```
+
+## 2. User Service (Layered Architecture)
+
+```
+user/
+└── src/main/java/com/unicorn/hgzero/user/
+    ├── UserApplication.java
+    ├── controller/
+    │   └── UserController.java
+    ├── dto/
+    │   ├── LoginRequest.java
+    │   ├── LoginResponse.java
+    │   ├── RefreshTokenRequest.java
+    │   ├── RefreshTokenResponse.java
+    │   ├── LogoutRequest.java
+    │   └── TokenValidateResponse.java
+    ├── service/
+    │   ├── UserService.java
+    │   └── UserServiceImpl.java
+    ├── domain/
+    │   └── User.java
+    ├── repository/
+    │   ├── entity/
+    │   │   └── UserEntity.java
+    │   └── jpa/
+    │       └── UserRepository.java
+    └── config/
+        ├── SecurityConfig.java
+        ├── SwaggerConfig.java
+        ├── LdapConfig.java
+        └── jwt/
+            ├── JwtAuthenticationFilter.java
+            ├── JwtTokenProvider.java
+            └── UserPrincipal.java
+```
+
+## 3. Meeting Service (Clean Architecture)
+
+```
+meeting/
+└── src/main/java/com/unicorn/hgzero/meeting/
+    ├── biz/
+    │   ├── domain/
+    │   │   ├── Meeting.java
+    │   │   ├── Minutes.java
+    │   │   ├── MinutesSection.java
+    │   │   ├── Todo.java
+    │   │   ├── Template.java
+    │   │   └── Dashboard.java
+    │   ├── dto/
+    │   │   ├── MeetingDto.java
+    │   │   ├── MinutesDto.java
+    │   │   ├── TodoDto.java
+    │   │   ├── TemplateDto.java
+    │   │   ├── DashboardDto.java
+    │   │   └── WebSocketMessageDto.java
+    │   ├── usecase/
+    │   │   ├── in/
+    │   │   │   ├── CreateMeetingUseCase.java
+    │   │   │   ├── SelectTemplateUseCase.java
+    │   │   │   ├── StartMeetingUseCase.java
+    │   │   │   ├── EndMeetingUseCase.java
+    │   │   │   ├── GetMinutesListUseCase.java
+    │   │   │   ├── GetMinutesDetailUseCase.java
+    │   │   │   ├── UpdateMinutesUseCase.java
+    │   │   │   ├── FinalizeMinutesUseCase.java
+    │   │   │   ├── VerifySectionUseCase.java
+    │   │   │   ├── LockSectionUseCase.java
+    │   │   │   ├── UnlockSectionUseCase.java
+    │   │   │   ├── CreateTodoUseCase.java
+    │   │   │   ├── CompleteTodoUseCase.java
+    │   │   │   ├── GetTemplateListUseCase.java
+    │   │   │   ├── GetTemplateDetailUseCase.java
+    │   │   │   └── GetDashboardUseCase.java
+    │   │   └── out/
+    │   │       ├── MeetingReader.java
+    │   │       ├── MeetingWriter.java
+    │   │       ├── MinutesReader.java
+    │   │       ├── MinutesWriter.java
+    │   │       ├── TodoReader.java
+    │   │       ├── TodoWriter.java
+    │   │       ├── TemplateReader.java
+    │   │       ├── CacheManager.java
+    │   │       └── EventPublisher.java
+    │   └── service/
+    │       ├── MeetingService.java
+    │       ├── MinutesService.java
+    │       ├── TodoService.java
+    │       ├── TemplateService.java
+    │       ├── DashboardService.java
+    │       └── WebSocketService.java
+    └── infra/
+        ├── MeetingApplication.java
+        ├── controller/
+        │   ├── MeetingController.java
+        │   ├── MinutesController.java
+        │   ├── TodoController.java
+        │   ├── TemplateController.java
+        │   ├── DashboardController.java
+        │   └── WebSocketController.java
+        ├── gateway/
+        │   ├── entity/
+        │   │   ├── MeetingEntity.java
+        │   │   ├── MinutesEntity.java
+        │   │   ├── MinutesSectionEntity.java
+        │   │   ├── TodoEntity.java
+        │   │   └── TemplateEntity.java
+        │   ├── repository/
+        │   │   ├── MeetingJpaRepository.java
+        │   │   ├── MinutesJpaRepository.java
+        │   │   ├── TodoJpaRepository.java
+        │   │   └── TemplateJpaRepository.java
+        │   ├── MeetingGateway.java
+        │   ├── MinutesGateway.java
+        │   ├── TodoGateway.java
+        │   ├── TemplateGateway.java
+        │   ├── CacheGateway.java
+        │   └── EventPublisherGateway.java
+        └── config/
+            ├── SecurityConfig.java
+            ├── SwaggerConfig.java
+            ├── WebSocketConfig.java
+            ├── RedisConfig.java
+            └── jwt/
+                ├── JwtAuthenticationFilter.java
+                ├── JwtTokenProvider.java
+                └── UserPrincipal.java
+```
+
+## 4. STT Service (Layered Architecture)
+
+```
+stt/
+└── src/main/java/com/unicorn/hgzero/stt/
+    ├── SttApplication.java
+    ├── controller/
+    │   ├── RecordingController.java
+    │   ├── TranscriptionController.java
+    │   └── SpeakerController.java
+    ├── dto/
+    │   ├── RecordingDto.java
+    │   ├── TranscriptionDto.java
+    │   ├── SpeakerDto.java
+    │   └── TranscriptSegmentDto.java
+    ├── service/
+    │   ├── RecordingService.java
+    │   ├── RecordingServiceImpl.java
+    │   ├── TranscriptionService.java
+    │   ├── TranscriptionServiceImpl.java
+    │   ├── SpeakerService.java
+    │   └── SpeakerServiceImpl.java
+    ├── domain/
+    │   ├── Recording.java
+    │   ├── Transcription.java
+    │   ├── TranscriptSegment.java
+    │   └── Speaker.java
+    ├── repository/
+    │   ├── entity/
+    │   │   ├── RecordingEntity.java
+    │   │   ├── TranscriptionEntity.java
+    │   │   └── SpeakerEntity.java
+    │   └── jpa/
+    │       ├── RecordingRepository.java
+    │       ├── TranscriptionRepository.java
+    │       └── SpeakerRepository.java
+    └── config/
+        ├── SecurityConfig.java
+        ├── SwaggerConfig.java
+        ├── AzureSpeechConfig.java
+        ├── AzureBlobConfig.java
+        ├── WebSocketConfig.java
+        └── jwt/
+            ├── JwtAuthenticationFilter.java
+            ├── JwtTokenProvider.java
+            └── UserPrincipal.java
+```
+
+## 5. AI Service (Clean Architecture)
+
+```
+ai/
+└── src/main/java/com/unicorn/hgzero/ai/
+    ├── biz/
+    │   ├── domain/
+    │   │   ├── ProcessedTranscript.java
+    │   │   ├── ExtractedTodo.java
+    │   │   ├── RelatedMinutes.java
+    │   │   ├── Term.java
+    │   │   └── Suggestion.java
+    │   ├── dto/
+    │   │   ├── TranscriptDto.java
+    │   │   ├── TodoDto.java
+    │   │   ├── RelatedMinutesDto.java
+    │   │   ├── TermDto.java
+    │   │   └── SuggestionDto.java
+    │   ├── usecase/
+    │   │   ├── in/
+    │   │   │   ├── ProcessTranscriptUseCase.java
+    │   │   │   ├── ImproveTranscriptUseCase.java
+    │   │   │   ├── ExtractTodoUseCase.java
+    │   │   │   ├── GetRelatedMinutesUseCase.java
+    │   │   │   ├── DetectTermsUseCase.java
+    │   │   │   ├── ExplainTermUseCase.java
+    │   │   │   ├── SuggestDiscussionUseCase.java
+    │   │   │   └── SuggestDecisionUseCase.java
+    │   │   └── out/
+    │   │       ├── TranscriptReader.java
+    │   │       ├── TranscriptWriter.java
+    │   │       ├── TodoWriter.java
+    │   │       ├── RelatedMinutesReader.java
+    │   │       ├── TermReader.java
+    │   │       ├── LlmClient.java
+    │   │       ├── VectorSearchClient.java
+    │   │       └── CacheManager.java
+    │   └── service/
+    │       ├── TranscriptService.java
+    │       ├── TodoService.java
+    │       ├── RelatedMinutesService.java
+    │       ├── TermService.java
+    │       └── SuggestionService.java
+    └── infra/
+        ├── AiApplication.java
+        ├── controller/
+        │   ├── TranscriptController.java
+        │   ├── TodoController.java
+        │   ├── TermController.java
+        │   └── SuggestionController.java
+        ├── gateway/
+        │   ├── entity/
+        │   │   ├── TranscriptEntity.java
+        │   │   └── TermEntity.java
+        │   ├── repository/
+        │   │   ├── TranscriptJpaRepository.java
+        │   │   └── TermJpaRepository.java
+        │   ├── TranscriptGateway.java
+        │   ├── TodoGateway.java
+        │   ├── RelatedMinutesGateway.java
+        │   ├── TermGateway.java
+        │   ├── LlmGateway.java
+        │   ├── VectorSearchGateway.java
+        │   └── CacheGateway.java
+        └── config/
+            ├── SecurityConfig.java
+            ├── SwaggerConfig.java
+            ├── OpenAiConfig.java
+            ├── AzureAiSearchConfig.java
+            ├── RedisConfig.java
+            └── jwt/
+                ├── JwtAuthenticationFilter.java
+                ├── JwtTokenProvider.java
+                └── UserPrincipal.java
+```
+
+## 6. Notification Service (Layered Architecture)
+
+```
+notification/
+└── src/main/java/com/unicorn/hgzero/notification/
+    ├── NotificationApplication.java
+    ├── controller/
+    │   ├── NotificationController.java
+    │   └── NotificationSettingsController.java
+    ├── dto/
+    │   ├── NotificationDto.java
+    │   ├── NotificationSettingsDto.java
+    │   ├── EmailTemplateDto.java
+    │   └── InvitationNotificationDto.java
+    ├── service/
+    │   ├── NotificationService.java
+    │   ├── NotificationServiceImpl.java
+    │   ├── NotificationSettingsService.java
+    │   ├── NotificationSettingsServiceImpl.java
+    │   ├── EmailService.java
+    │   └── EmailServiceImpl.java
+    ├── domain/
+    │   ├── Notification.java
+    │   ├── NotificationSettings.java
+    │   └── EmailTemplate.java
+    ├── repository/
+    │   ├── entity/
+    │   │   ├── NotificationEntity.java
+    │   │   └── NotificationSettingsEntity.java
+    │   └── jpa/
+    │       ├── NotificationRepository.java
+    │       └── NotificationSettingsRepository.java
+    └── config/
+        ├── SecurityConfig.java
+        ├── SwaggerConfig.java
+        ├── EmailConfig.java
+        ├── EventHubConfig.java
+        └── jwt/
+            ├── JwtAuthenticationFilter.java
+            ├── JwtTokenProvider.java
+            └── UserPrincipal.java
+```
+
+## 패키지 네이밍 규칙
+
+### 공통
+- **Base Package**: `com.unicorn.hgzero`
+
+### Layered Architecture (User, STT, Notification)
+- **Package**: `com.unicorn.hgzero.{service-name}`
+- **구조**:
+  - controller: REST API 컨트롤러
+  - service: 비즈니스 로직
+  - domain: 도메인 모델
+  - dto: 데이터 전송 객체
+  - repository: 데이터 액세스
+    - entity: JPA 엔티티
+    - jpa: JPA Repository
+  - config: 설정 클래스
+
+### Clean Architecture (Meeting, AI)
+- **Base Package**: `com.unicorn.hgzero.{service-name}`
+- **구조**:
+  - biz: 비즈니스 레이어
+    - domain: 도메인 모델
+    - dto: 비즈니스 DTO
+    - usecase: 유스케이스
+      - in: 입력 포트 (인터페이스)
+      - out: 출력 포트 (인터페이스)
+    - service: 유스케이스 구현체
+  - infra: 인프라스트럭처 레이어
+    - controller: REST API 컨트롤러
+    - gateway: 출력 포트 구현체
+      - entity: JPA 엔티티
+      - repository: JPA Repository
+    - config: 설정 클래스
+
+## 설정 파일 구조
+
+```
+각 서비스/
+├── src/main/resources/
+│   ├── application.yml           # 메인 설정
+│   └── application-dev.yml       # 개발 환경 설정
+└── build.gradle                  # Gradle 빌드 설정
+```
+
+## 공통 라이브러리 의존성 (루트 build.gradle에 정의)
+
+- Spring Boot Starter Web
+- Spring Boot Starter Data JPA
+- Spring Boot Starter Security
+- Spring Boot Starter Actuator
+- Spring Boot Configuration Processor
+- Lombok
+- MapStruct
+- Springdoc OpenAPI (Swagger)
+- JWT (jjwt-api, jjwt-impl, jjwt-jackson)
+- PostgreSQL Driver
+- Redis (Lettuce)
+- Apache Commons Lang3
+- Apache Commons IO
+
+## 서비스별 추가 의존성
+
+### User Service
+- Spring LDAP
+
+### Meeting Service
+- Spring WebSocket
+- Spring Messaging
+
+### STT Service
+- Azure Speech SDK
+- Azure Blob Storage SDK
+- Spring WebSocket
+
+### AI Service
+- OpenAI Java Client
+- Azure AI Search SDK
+- Spring AI
+
+### Notification Service
+- Spring Mail
+- Azure Event Hubs SDK
+- Thymeleaf (Email Template)
diff --git a/meeting/build.gradle b/meeting/build.gradle
new file mode 100644
index 0000000..57b7ca4
--- /dev/null
+++ b/meeting/build.gradle
@@ -0,0 +1,9 @@
+bootJar {
+    archiveFileName = 'meeting.jar'
+}
+
+dependencies {
+    // WebSocket
+    implementation 'org.springframework.boot:spring-boot-starter-websocket'
+    implementation 'org.springframework.boot:spring-boot-starter-reactor-netty'
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Dashboard.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Dashboard.java
new file mode 100644
index 0000000..9e6971f
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Dashboard.java
@@ -0,0 +1,77 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * 대시보드 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Dashboard {
+
+    /**
+     * 다가오는 회의 목록
+     */
+    private List<Meeting> upcomingMeetings;
+
+    /**
+     * 최근 회의록 목록
+     */
+    private List<Minutes> recentMinutes;
+
+    /**
+     * 할당된 Todo 목록
+     */
+    private List<Todo> assignedTodos;
+
+    /**
+     * 통계 정보
+     */
+    private Statistics statistics;
+
+    /**
+     * 통계 정보 내부 클래스
+     */
+    @Getter
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class Statistics {
+        /**
+         * 전체 회의 수
+         */
+        private Integer totalMeetings;
+
+        /**
+         * 진행 중인 회의 수
+         */
+        private Integer inProgressMeetings;
+
+        /**
+         * 완료된 회의 수
+         */
+        private Integer completedMeetings;
+
+        /**
+         * 전체 Todo 수
+         */
+        private Integer totalTodos;
+
+        /**
+         * 완료된 Todo 수
+         */
+        private Integer completedTodos;
+
+        /**
+         * 지연된 Todo 수
+         */
+        private Integer overdueTodos;
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Meeting.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Meeting.java
new file mode 100644
index 0000000..e2bb9b0
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Meeting.java
@@ -0,0 +1,99 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 회의 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Meeting {
+
+    /**
+     * 회의 ID
+     */
+    private String meetingId;
+
+    /**
+     * 회의 제목
+     */
+    private String title;
+
+    /**
+     * 회의 설명
+     */
+    private String description;
+
+    /**
+     * 회의 일시
+     */
+    private LocalDateTime scheduledAt;
+
+    /**
+     * 회의 시작 일시
+     */
+    private LocalDateTime startedAt;
+
+    /**
+     * 회의 종료 일시
+     */
+    private LocalDateTime endedAt;
+
+    /**
+     * 회의 상태 (SCHEDULED, IN_PROGRESS, COMPLETED, CANCELLED)
+     */
+    private String status;
+
+    /**
+     * 주최자 ID
+     */
+    private String organizerId;
+
+    /**
+     * 참석자 ID 목록
+     */
+    private List<String> participants;
+
+    /**
+     * 템플릿 ID
+     */
+    private String templateId;
+
+    /**
+     * 회의 시작
+     */
+    public void start() {
+        this.status = "IN_PROGRESS";
+        this.startedAt = LocalDateTime.now();
+    }
+
+    /**
+     * 회의 종료
+     */
+    public void end() {
+        this.status = "COMPLETED";
+        this.endedAt = LocalDateTime.now();
+    }
+
+    /**
+     * 회의 취소
+     */
+    public void cancel() {
+        this.status = "CANCELLED";
+    }
+
+    /**
+     * 회의 진행 중 여부 확인
+     */
+    public boolean isInProgress() {
+        return "IN_PROGRESS".equals(this.status);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Minutes.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Minutes.java
new file mode 100644
index 0000000..8198908
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Minutes.java
@@ -0,0 +1,87 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 회의록 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Minutes {
+
+    /**
+     * 회의록 ID
+     */
+    private String minutesId;
+
+    /**
+     * 회의 ID
+     */
+    private String meetingId;
+
+    /**
+     * 회의록 제목
+     */
+    private String title;
+
+    /**
+     * 회의록 섹션 목록
+     */
+    private List<MinutesSection> sections;
+
+    /**
+     * 회의록 상태 (DRAFT, FINALIZED)
+     */
+    private String status;
+
+    /**
+     * 버전
+     */
+    private Integer version;
+
+    /**
+     * 작성자 ID
+     */
+    private String createdBy;
+
+    /**
+     * 확정자 ID
+     */
+    private String finalizedBy;
+
+    /**
+     * 확정 일시
+     */
+    private LocalDateTime finalizedAt;
+
+    /**
+     * 회의록 확정
+     */
+    public void finalize(String userId) {
+        this.status = "FINALIZED";
+        this.finalizedBy = userId;
+        this.finalizedAt = LocalDateTime.now();
+    }
+
+    /**
+     * 회의록 수정
+     */
+    public void update() {
+        this.version++;
+    }
+
+    /**
+     * 회의록 확정 여부 확인
+     */
+    public boolean isFinalized() {
+        return "FINALIZED".equals(this.status);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/MinutesSection.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/MinutesSection.java
new file mode 100644
index 0000000..4a332f9
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/MinutesSection.java
@@ -0,0 +1,98 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 회의록 섹션 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class MinutesSection {
+
+    /**
+     * 섹션 ID
+     */
+    private String sectionId;
+
+    /**
+     * 회의록 ID
+     */
+    private String minutesId;
+
+    /**
+     * 섹션 유형 (AGENDA, DISCUSSION, DECISION, ACTION_ITEM)
+     */
+    private String type;
+
+    /**
+     * 섹션 제목
+     */
+    private String title;
+
+    /**
+     * 섹션 내용
+     */
+    private String content;
+
+    /**
+     * 섹션 순서
+     */
+    private Integer order;
+
+    /**
+     * 검증 완료 여부
+     */
+    private Boolean verified;
+
+    /**
+     * 잠금 여부
+     */
+    private Boolean locked;
+
+    /**
+     * 잠금 사용자 ID
+     */
+    private String lockedBy;
+
+    /**
+     * 섹션 잠금
+     */
+    public void lock(String userId) {
+        this.locked = true;
+        this.lockedBy = userId;
+    }
+
+    /**
+     * 섹션 잠금 해제
+     */
+    public void unlock() {
+        this.locked = false;
+        this.lockedBy = null;
+    }
+
+    /**
+     * 섹션 검증 완료
+     */
+    public void verify() {
+        this.verified = true;
+    }
+
+    /**
+     * 섹션 잠금 여부 확인
+     */
+    public boolean isLocked() {
+        return Boolean.TRUE.equals(this.locked);
+    }
+
+    /**
+     * 섹션 검증 완료 여부 확인
+     */
+    public boolean isVerified() {
+        return Boolean.TRUE.equals(this.verified);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Template.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Template.java
new file mode 100644
index 0000000..74d5b9e
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Template.java
@@ -0,0 +1,82 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * 회의록 템플릿 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Template {
+
+    /**
+     * 템플릿 ID
+     */
+    private String templateId;
+
+    /**
+     * 템플릿 이름
+     */
+    private String name;
+
+    /**
+     * 템플릿 설명
+     */
+    private String description;
+
+    /**
+     * 템플릿 카테고리 (GENERAL, TECHNICAL, MANAGEMENT, SALES)
+     */
+    private String category;
+
+    /**
+     * 템플릿 섹션 목록
+     */
+    private List<TemplateSection> sections;
+
+    /**
+     * 공개 여부
+     */
+    private Boolean isPublic;
+
+    /**
+     * 생성자 ID
+     */
+    private String createdBy;
+
+    /**
+     * 템플릿 섹션 내부 클래스
+     */
+    @Getter
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class TemplateSection {
+        /**
+         * 섹션 유형
+         */
+        private String type;
+
+        /**
+         * 섹션 제목
+         */
+        private String title;
+
+        /**
+         * 섹션 순서
+         */
+        private Integer order;
+
+        /**
+         * 기본 내용
+         */
+        private String defaultContent;
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Todo.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Todo.java
new file mode 100644
index 0000000..f6b24c7
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/domain/Todo.java
@@ -0,0 +1,100 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+/**
+ * Todo 도메인 모델
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Todo {
+
+    /**
+     * Todo ID
+     */
+    private String todoId;
+
+    /**
+     * 회의록 ID
+     */
+    private String minutesId;
+
+    /**
+     * 회의 ID
+     */
+    private String meetingId;
+
+    /**
+     * Todo 제목
+     */
+    private String title;
+
+    /**
+     * Todo 설명
+     */
+    private String description;
+
+    /**
+     * 담당자 ID
+     */
+    private String assigneeId;
+
+    /**
+     * 마감일
+     */
+    private LocalDate dueDate;
+
+    /**
+     * Todo 상태 (PENDING, IN_PROGRESS, COMPLETED, CANCELLED)
+     */
+    private String status;
+
+    /**
+     * 우선순위 (HIGH, MEDIUM, LOW)
+     */
+    private String priority;
+
+    /**
+     * 완료 일시
+     */
+    private LocalDateTime completedAt;
+
+    /**
+     * Todo 완료
+     */
+    public void complete() {
+        this.status = "COMPLETED";
+        this.completedAt = LocalDateTime.now();
+    }
+
+    /**
+     * Todo 취소
+     */
+    public void cancel() {
+        this.status = "CANCELLED";
+    }
+
+    /**
+     * Todo 완료 여부 확인
+     */
+    public boolean isCompleted() {
+        return "COMPLETED".equals(this.status);
+    }
+
+    /**
+     * 마감일 지남 여부 확인
+     */
+    public boolean isOverdue() {
+        return this.dueDate != null &&
+               LocalDate.now().isAfter(this.dueDate) &&
+               !isCompleted();
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/DashboardService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/DashboardService.java
new file mode 100644
index 0000000..80704ae
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/DashboardService.java
@@ -0,0 +1,43 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.meeting.biz.domain.Dashboard;
+import com.unicorn.hgzero.meeting.biz.usecase.in.dashboard.GetDashboardUseCase;
+import com.unicorn.hgzero.meeting.biz.usecase.out.DashboardReader;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * 대시보드 Service
+ * Dashboard 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class DashboardService implements GetDashboardUseCase {
+
+    private final DashboardReader dashboardReader;
+
+    /**
+     * 사용자 대시보드 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Dashboard getDashboard(String userId) {
+        log.debug("Getting dashboard for user: {}", userId);
+
+        return dashboardReader.getDashboardByUserId(userId);
+    }
+
+    /**
+     * 사용자 대시보드 (기간 필터) 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Dashboard getDashboardByPeriod(String userId, String period) {
+        log.debug("Getting dashboard for user: {} with period: {}", userId, period);
+
+        return dashboardReader.getDashboardByUserIdAndPeriod(userId, period);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MeetingService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MeetingService.java
new file mode 100644
index 0000000..eb8d7e7
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MeetingService.java
@@ -0,0 +1,201 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+import com.unicorn.hgzero.meeting.biz.usecase.in.meeting.*;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MeetingReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MeetingWriter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * 회의 Service
+ * Meeting 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class MeetingService implements
+        CreateMeetingUseCase,
+        StartMeetingUseCase,
+        EndMeetingUseCase,
+        CancelMeetingUseCase,
+        GetMeetingUseCase {
+
+    private final MeetingReader meetingReader;
+    private final MeetingWriter meetingWriter;
+
+    /**
+     * 회의 생성
+     */
+    @Override
+    @Transactional
+    public Meeting createMeeting(CreateMeetingCommand command) {
+        log.info("Creating meeting: {}", command.title());
+
+        // 회의 ID 생성
+        String meetingId = UUID.randomUUID().toString();
+
+        // 회의 도메인 객체 생성
+        Meeting meeting = Meeting.builder()
+                .meetingId(meetingId)
+                .title(command.title())
+                .description(command.description())
+                .scheduledAt(command.scheduledAt())
+                .status("SCHEDULED")
+                .organizerId(command.organizerId())
+                .participants(command.participants())
+                .templateId(command.templateId())
+                .build();
+
+        // 회의 저장
+        Meeting savedMeeting = meetingWriter.save(meeting);
+
+        log.info("Meeting created successfully: {}", savedMeeting.getMeetingId());
+        return savedMeeting;
+    }
+
+    /**
+     * 회의 시작
+     */
+    @Override
+    @Transactional
+    public Meeting startMeeting(String meetingId) {
+        log.info("Starting meeting: {}", meetingId);
+
+        // 회의 조회
+        Meeting meeting = meetingReader.findById(meetingId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 회의 상태 검증
+        if (!"SCHEDULED".equals(meeting.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 회의 시작
+        meeting.start();
+
+        // 저장
+        Meeting updatedMeeting = meetingWriter.save(meeting);
+
+        log.info("Meeting started successfully: {}", meetingId);
+        return updatedMeeting;
+    }
+
+    /**
+     * 회의 종료
+     */
+    @Override
+    @Transactional
+    public Meeting endMeeting(String meetingId) {
+        log.info("Ending meeting: {}", meetingId);
+
+        // 회의 조회
+        Meeting meeting = meetingReader.findById(meetingId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 회의 상태 검증
+        if (!"IN_PROGRESS".equals(meeting.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 회의 종료
+        meeting.end();
+
+        // 저장
+        Meeting updatedMeeting = meetingWriter.save(meeting);
+
+        log.info("Meeting ended successfully: {}", meetingId);
+        return updatedMeeting;
+    }
+
+    /**
+     * 회의 취소
+     */
+    @Override
+    @Transactional
+    public Meeting cancelMeeting(String meetingId) {
+        log.info("Canceling meeting: {}", meetingId);
+
+        // 회의 조회
+        Meeting meeting = meetingReader.findById(meetingId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 회의 취소 가능 상태 검증
+        if ("COMPLETED".equals(meeting.getStatus()) || "CANCELLED".equals(meeting.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 회의 취소
+        meeting.cancel();
+
+        // 저장
+        Meeting updatedMeeting = meetingWriter.save(meeting);
+
+        log.info("Meeting cancelled successfully: {}", meetingId);
+        return updatedMeeting;
+    }
+
+    /**
+     * ID로 회의 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Meeting getMeeting(String meetingId) {
+        log.debug("Getting meeting: {}", meetingId);
+
+        return meetingReader.findById(meetingId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 주최자 ID로 회의 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Meeting> getMeetingsByOrganizer(String organizerId) {
+        log.debug("Getting meetings by organizer: {}", organizerId);
+
+        return meetingReader.findByOrganizerId(organizerId);
+    }
+
+    /**
+     * 상태로 회의 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Meeting> getMeetingsByStatus(String status) {
+        log.debug("Getting meetings by status: {}", status);
+
+        return meetingReader.findByStatus(status);
+    }
+
+    /**
+     * 일정 시간 범위로 회의 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Meeting> getMeetingsByScheduledTime(LocalDateTime startTime, LocalDateTime endTime) {
+        log.debug("Getting meetings by scheduled time: {} ~ {}", startTime, endTime);
+
+        return meetingReader.findByScheduledTimeBetween(startTime, endTime);
+    }
+
+    /**
+     * 주최자 ID와 상태로 회의 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Meeting> getMeetingsByOrganizerAndStatus(String organizerId, String status) {
+        log.debug("Getting meetings by organizer: {} and status: {}", organizerId, status);
+
+        return meetingReader.findByOrganizerIdAndStatus(organizerId, status);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesSectionService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesSectionService.java
new file mode 100644
index 0000000..6de3193
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesSectionService.java
@@ -0,0 +1,234 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+import com.unicorn.hgzero.meeting.biz.usecase.in.section.*;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesSectionReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesSectionWriter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * 회의록 섹션 Service
+ * MinutesSection 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class MinutesSectionService implements
+        CreateSectionUseCase,
+        UpdateSectionUseCase,
+        DeleteSectionUseCase,
+        LockSectionUseCase,
+        VerifySectionUseCase,
+        GetSectionUseCase {
+
+    private final MinutesSectionReader sectionReader;
+    private final MinutesSectionWriter sectionWriter;
+
+    /**
+     * 섹션 생성
+     */
+    @Override
+    @Transactional
+    public MinutesSection createSection(CreateSectionCommand command) {
+        log.info("Creating section for minutes: {}", command.minutesId());
+
+        // 섹션 ID 생성
+        String sectionId = UUID.randomUUID().toString();
+
+        // 섹션 도메인 객체 생성
+        MinutesSection section = MinutesSection.builder()
+                .sectionId(sectionId)
+                .minutesId(command.minutesId())
+                .type(command.type())
+                .title(command.title())
+                .content(command.content())
+                .order(command.order())
+                .verified(false)
+                .locked(false)
+                .build();
+
+        // 섹션 저장
+        MinutesSection savedSection = sectionWriter.save(section);
+
+        log.info("Section created successfully: {}", savedSection.getSectionId());
+        return savedSection;
+    }
+
+    /**
+     * 섹션 내용 수정
+     */
+    @Override
+    @Transactional
+    public MinutesSection updateSection(UpdateSectionCommand command) {
+        log.info("Updating section: {}", command.sectionId());
+
+        // 섹션 조회
+        MinutesSection section = sectionReader.findById(command.sectionId())
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 잠금 상태 검증
+        if (Boolean.TRUE.equals(section.getLocked())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 검증 상태 검증
+        if (Boolean.TRUE.equals(section.getVerified())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 섹션 수정
+        section.update(command.title(), command.content());
+
+        // 저장
+        MinutesSection updatedSection = sectionWriter.save(section);
+
+        log.info("Section updated successfully: {}", command.sectionId());
+        return updatedSection;
+    }
+
+    /**
+     * 섹션 삭제
+     */
+    @Override
+    @Transactional
+    public void deleteSection(String sectionId) {
+        log.info("Deleting section: {}", sectionId);
+
+        // 섹션 조회
+        MinutesSection section = sectionReader.findById(sectionId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 검증 상태 확인 (검증된 섹션은 삭제 불가)
+        if (Boolean.TRUE.equals(section.getVerified())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 섹션 삭제
+        sectionWriter.delete(sectionId);
+
+        log.info("Section deleted successfully: {}", sectionId);
+    }
+
+    /**
+     * 섹션 잠금
+     */
+    @Override
+    @Transactional
+    public MinutesSection lockSection(String sectionId, String userId) {
+        log.info("Locking section: {} by user: {}", sectionId, userId);
+
+        // 섹션 조회
+        MinutesSection section = sectionReader.findById(sectionId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 이미 잠금 상태 확인
+        if (Boolean.TRUE.equals(section.getLocked())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 섹션 잠금
+        section.lock(userId);
+
+        // 저장
+        MinutesSection lockedSection = sectionWriter.save(section);
+
+        log.info("Section locked successfully: {}", sectionId);
+        return lockedSection;
+    }
+
+    /**
+     * 섹션 잠금 해제
+     */
+    @Override
+    @Transactional
+    public MinutesSection unlockSection(String sectionId) {
+        log.info("Unlocking section: {}", sectionId);
+
+        // 섹션 조회
+        MinutesSection section = sectionReader.findById(sectionId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 잠금 상태 확인
+        if (Boolean.FALSE.equals(section.getLocked())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 섹션 잠금 해제
+        section.unlock();
+
+        // 저장
+        MinutesSection unlockedSection = sectionWriter.save(section);
+
+        log.info("Section unlocked successfully: {}", sectionId);
+        return unlockedSection;
+    }
+
+    /**
+     * 섹션 검증
+     */
+    @Override
+    @Transactional
+    public MinutesSection verifySection(String sectionId) {
+        log.info("Verifying section: {}", sectionId);
+
+        // 섹션 조회
+        MinutesSection section = sectionReader.findById(sectionId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 이미 검증 상태 확인
+        if (Boolean.TRUE.equals(section.getVerified())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 섹션 검증
+        section.verify();
+
+        // 저장
+        MinutesSection verifiedSection = sectionWriter.save(section);
+
+        log.info("Section verified successfully: {}", sectionId);
+        return verifiedSection;
+    }
+
+    /**
+     * ID로 섹션 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public MinutesSection getSection(String sectionId) {
+        log.debug("Getting section: {}", sectionId);
+
+        return sectionReader.findById(sectionId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 회의록 ID로 섹션 목록 조회 (순서대로)
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<MinutesSection> getSectionsByMinutes(String minutesId) {
+        log.debug("Getting sections by minutes: {}", minutesId);
+
+        return sectionReader.findByMinutesIdOrderByOrder(minutesId);
+    }
+
+    /**
+     * 회의록 ID와 타입으로 섹션 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<MinutesSection> getSectionsByMinutesAndType(String minutesId, String type) {
+        log.debug("Getting sections by minutes: {} and type: {}", minutesId, type);
+
+        return sectionReader.findByMinutesIdAndType(minutesId, type);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesService.java
new file mode 100644
index 0000000..47108db
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/MinutesService.java
@@ -0,0 +1,193 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+import com.unicorn.hgzero.meeting.biz.usecase.in.minutes.*;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesWriter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * 회의록 Service
+ * Minutes 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class MinutesService implements
+        CreateMinutesUseCase,
+        UpdateMinutesUseCase,
+        FinalizeMinutesUseCase,
+        GetMinutesUseCase {
+
+    private final MinutesReader minutesReader;
+    private final MinutesWriter minutesWriter;
+
+    /**
+     * 회의록 생성
+     */
+    @Override
+    @Transactional
+    public Minutes createMinutes(CreateMinutesCommand command) {
+        log.info("Creating minutes for meeting: {}", command.meetingId());
+
+        // 회의록 ID 생성
+        String minutesId = UUID.randomUUID().toString();
+
+        // 회의록 도메인 객체 생성
+        Minutes minutes = Minutes.builder()
+                .minutesId(minutesId)
+                .meetingId(command.meetingId())
+                .title(command.title())
+                .status("DRAFT")
+                .version(1)
+                .createdBy(command.createdBy())
+                .build();
+
+        // 회의록 저장
+        Minutes savedMinutes = minutesWriter.save(minutes);
+
+        log.info("Minutes created successfully: {}", savedMinutes.getMinutesId());
+        return savedMinutes;
+    }
+
+    /**
+     * 회의록 제목 수정
+     */
+    @Override
+    @Transactional
+    public Minutes updateMinutesTitle(String minutesId, String title) {
+        log.info("Updating minutes title: {}", minutesId);
+
+        // 회의록 조회
+        Minutes minutes = minutesReader.findById(minutesId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 상태 검증 (확정된 회의록은 수정 불가)
+        if ("FINALIZED".equals(minutes.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 제목 수정
+        minutes.update(title, minutes.getSections());
+
+        // 저장
+        Minutes updatedMinutes = minutesWriter.save(minutes);
+
+        log.info("Minutes title updated successfully: {}", minutesId);
+        return updatedMinutes;
+    }
+
+    /**
+     * 회의록 버전 증가
+     */
+    @Override
+    @Transactional
+    public Minutes incrementVersion(String minutesId) {
+        log.info("Incrementing minutes version: {}", minutesId);
+
+        // 회의록 조회
+        Minutes minutes = minutesReader.findById(minutesId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 버전 증가
+        minutes.incrementVersion();
+
+        // 저장
+        Minutes updatedMinutes = minutesWriter.save(minutes);
+
+        log.info("Minutes version incremented: {} -> {}", minutesId, updatedMinutes.getVersion());
+        return updatedMinutes;
+    }
+
+    /**
+     * 회의록 확정
+     */
+    @Override
+    @Transactional
+    public Minutes finalizeMinutes(String minutesId, String userId) {
+        log.info("Finalizing minutes: {}", minutesId);
+
+        // 회의록 조회
+        Minutes minutes = minutesReader.findById(minutesId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 상태 검증
+        if ("FINALIZED".equals(minutes.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // 회의록 확정
+        minutes.finalize(userId);
+
+        // 저장
+        Minutes finalizedMinutes = minutesWriter.save(minutes);
+
+        log.info("Minutes finalized successfully: {}", minutesId);
+        return finalizedMinutes;
+    }
+
+    /**
+     * ID로 회의록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Minutes getMinutes(String minutesId) {
+        log.debug("Getting minutes: {}", minutesId);
+
+        return minutesReader.findById(minutesId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 회의 ID로 회의록 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Minutes> getMinutesByMeeting(String meetingId) {
+        log.debug("Getting minutes by meeting: {}", meetingId);
+
+        return minutesReader.findByMeetingId(meetingId);
+    }
+
+    /**
+     * 회의 ID로 최신 회의록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Minutes getLatestMinutes(String meetingId) {
+        log.debug("Getting latest minutes for meeting: {}", meetingId);
+
+        return minutesReader.findLatestByMeetingId(meetingId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 작성자 ID로 회의록 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Minutes> getMinutesByCreator(String createdBy) {
+        log.debug("Getting minutes by creator: {}", createdBy);
+
+        return minutesReader.findByCreatedBy(createdBy);
+    }
+
+    /**
+     * 상태로 회의록 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Minutes> getMinutesByStatus(String status) {
+        log.debug("Getting minutes by status: {}", status);
+
+        return minutesReader.findByStatus(status);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TemplateService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TemplateService.java
new file mode 100644
index 0000000..3606dc2
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TemplateService.java
@@ -0,0 +1,116 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+import com.unicorn.hgzero.meeting.biz.usecase.in.template.CreateTemplateUseCase;
+import com.unicorn.hgzero.meeting.biz.usecase.in.template.GetTemplateUseCase;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TemplateReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TemplateWriter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * 템플릿 Service
+ * Template 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class TemplateService implements
+        CreateTemplateUseCase,
+        GetTemplateUseCase {
+
+    private final TemplateReader templateReader;
+    private final TemplateWriter templateWriter;
+
+    /**
+     * 템플릿 생성
+     */
+    @Override
+    @Transactional
+    public Template createTemplate(CreateTemplateCommand command) {
+        log.info("Creating template: {}", command.name());
+
+        // 템플릿 ID 생성
+        String templateId = UUID.randomUUID().toString();
+
+        // 템플릿 도메인 객체 생성
+        Template template = Template.builder()
+                .templateId(templateId)
+                .name(command.name())
+                .description(command.description())
+                .category(command.category())
+                .sections(command.sections())
+                .isPublic(command.isPublic() != null ? command.isPublic() : true)
+                .createdBy(command.createdBy())
+                .build();
+
+        // 템플릿 저장
+        Template savedTemplate = templateWriter.save(template);
+
+        log.info("Template created successfully: {}", savedTemplate.getTemplateId());
+        return savedTemplate;
+    }
+
+    /**
+     * ID로 템플릿 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Template getTemplate(String templateId) {
+        log.debug("Getting template: {}", templateId);
+
+        return templateReader.findById(templateId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 카테고리로 템플릿 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Template> getTemplatesByCategory(String category) {
+        log.debug("Getting templates by category: {}", category);
+
+        return templateReader.findByCategory(category);
+    }
+
+    /**
+     * 공개 템플릿 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Template> getPublicTemplates() {
+        log.debug("Getting public templates");
+
+        return templateReader.findByIsPublic(true);
+    }
+
+    /**
+     * 작성자 ID로 템플릿 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Template> getTemplatesByCreator(String createdBy) {
+        log.debug("Getting templates by creator: {}", createdBy);
+
+        return templateReader.findByCreatedBy(createdBy);
+    }
+
+    /**
+     * 이름으로 템플릿 검색
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Template> searchTemplatesByName(String name) {
+        log.debug("Searching templates by name: {}", name);
+
+        return templateReader.findByNameContaining(name);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TodoService.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TodoService.java
new file mode 100644
index 0000000..aaac708
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/service/TodoService.java
@@ -0,0 +1,219 @@
+package com.unicorn.hgzero.meeting.biz.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+import com.unicorn.hgzero.meeting.biz.usecase.in.todo.*;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TodoReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TodoWriter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Todo Service
+ * Todo 관련 모든 UseCase 구현
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class TodoService implements
+        CreateTodoUseCase,
+        UpdateTodoUseCase,
+        CompleteTodoUseCase,
+        CancelTodoUseCase,
+        GetTodoUseCase {
+
+    private final TodoReader todoReader;
+    private final TodoWriter todoWriter;
+
+    /**
+     * Todo 생성
+     */
+    @Override
+    @Transactional
+    public Todo createTodo(CreateTodoCommand command) {
+        log.info("Creating todo: {}", command.title());
+
+        // Todo ID 생성
+        String todoId = UUID.randomUUID().toString();
+
+        // Todo 도메인 객체 생성
+        Todo todo = Todo.builder()
+                .todoId(todoId)
+                .minutesId(command.minutesId())
+                .meetingId(command.meetingId())
+                .title(command.title())
+                .description(command.description())
+                .assigneeId(command.assigneeId())
+                .dueDate(command.dueDate())
+                .status("PENDING")
+                .priority(command.priority() != null ? command.priority() : "MEDIUM")
+                .build();
+
+        // Todo 저장
+        Todo savedTodo = todoWriter.save(todo);
+
+        log.info("Todo created successfully: {}", savedTodo.getTodoId());
+        return savedTodo;
+    }
+
+    /**
+     * Todo 수정
+     */
+    @Override
+    @Transactional
+    public Todo updateTodo(UpdateTodoCommand command) {
+        log.info("Updating todo: {}", command.todoId());
+
+        // Todo 조회
+        Todo todo = todoReader.findById(command.todoId())
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 완료/취소 상태 검증
+        if ("COMPLETED".equals(todo.getStatus()) || "CANCELLED".equals(todo.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // Todo 수정
+        todo.update(
+                command.title(),
+                command.description(),
+                command.assigneeId(),
+                command.dueDate(),
+                command.priority()
+        );
+
+        // 저장
+        Todo updatedTodo = todoWriter.save(todo);
+
+        log.info("Todo updated successfully: {}", command.todoId());
+        return updatedTodo;
+    }
+
+    /**
+     * Todo 완료
+     */
+    @Override
+    @Transactional
+    public Todo completeTodo(String todoId) {
+        log.info("Completing todo: {}", todoId);
+
+        // Todo 조회
+        Todo todo = todoReader.findById(todoId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 상태 검증
+        if ("COMPLETED".equals(todo.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // Todo 완료
+        todo.complete();
+
+        // 저장
+        Todo completedTodo = todoWriter.save(todo);
+
+        log.info("Todo completed successfully: {}", todoId);
+        return completedTodo;
+    }
+
+    /**
+     * Todo 취소
+     */
+    @Override
+    @Transactional
+    public Todo cancelTodo(String todoId) {
+        log.info("Cancelling todo: {}", todoId);
+
+        // Todo 조회
+        Todo todo = todoReader.findById(todoId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+
+        // 상태 검증
+        if ("COMPLETED".equals(todo.getStatus()) || "CANCELLED".equals(todo.getStatus())) {
+            throw new BusinessException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // Todo 취소
+        todo.cancel();
+
+        // 저장
+        Todo cancelledTodo = todoWriter.save(todo);
+
+        log.info("Todo cancelled successfully: {}", todoId);
+        return cancelledTodo;
+    }
+
+    /**
+     * ID로 Todo 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public Todo getTodo(String todoId) {
+        log.debug("Getting todo: {}", todoId);
+
+        return todoReader.findById(todoId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND));
+    }
+
+    /**
+     * 회의 ID로 Todo 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Todo> getTodosByMeeting(String meetingId) {
+        log.debug("Getting todos by meeting: {}", meetingId);
+
+        return todoReader.findByMeetingId(meetingId);
+    }
+
+    /**
+     * 회의록 ID로 Todo 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Todo> getTodosByMinutes(String minutesId) {
+        log.debug("Getting todos by minutes: {}", minutesId);
+
+        return todoReader.findByMinutesId(minutesId);
+    }
+
+    /**
+     * 담당자 ID로 Todo 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Todo> getTodosByAssignee(String assigneeId) {
+        log.debug("Getting todos by assignee: {}", assigneeId);
+
+        return todoReader.findByAssigneeId(assigneeId);
+    }
+
+    /**
+     * 담당자 ID와 상태로 Todo 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Todo> getTodosByAssigneeAndStatus(String assigneeId, String status) {
+        log.debug("Getting todos by assignee: {} and status: {}", assigneeId, status);
+
+        return todoReader.findByAssigneeIdAndStatus(assigneeId, status);
+    }
+
+    /**
+     * 담당자 ID와 마감일 범위로 Todo 목록 조회
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public List<Todo> getTodosByAssigneeAndDueDateRange(String assigneeId, LocalDate startDate, LocalDate endDate) {
+        log.debug("Getting todos by assignee: {} and due date range: {} ~ {}", assigneeId, startDate, endDate);
+
+        return todoReader.findByAssigneeIdAndDueDateBetween(assigneeId, startDate, endDate);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/dashboard/GetDashboardUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/dashboard/GetDashboardUseCase.java
new file mode 100644
index 0000000..354c2ee
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/dashboard/GetDashboardUseCase.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.dashboard;
+
+import com.unicorn.hgzero.meeting.biz.domain.Dashboard;
+
+/**
+ * 대시보드 조회 UseCase
+ */
+public interface GetDashboardUseCase {
+
+    /**
+     * 사용자 대시보드 조회
+     */
+    Dashboard getDashboard(String userId);
+
+    /**
+     * 사용자 대시보드 (기간 필터) 조회
+     */
+    Dashboard getDashboardByPeriod(String userId, String period);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CancelMeetingUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CancelMeetingUseCase.java
new file mode 100644
index 0000000..9ddc702
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CancelMeetingUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.meeting;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+/**
+ * 회의 취소 UseCase
+ */
+public interface CancelMeetingUseCase {
+
+    /**
+     * 회의 취소
+     */
+    Meeting cancelMeeting(String meetingId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CreateMeetingUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CreateMeetingUseCase.java
new file mode 100644
index 0000000..31b4247
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/CreateMeetingUseCase.java
@@ -0,0 +1,29 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.meeting;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 회의 생성 UseCase
+ */
+public interface CreateMeetingUseCase {
+
+    /**
+     * 회의 생성
+     */
+    Meeting createMeeting(CreateMeetingCommand command);
+
+    /**
+     * 회의 생성 명령
+     */
+    record CreateMeetingCommand(
+            String title,
+            String description,
+            LocalDateTime scheduledAt,
+            String organizerId,
+            List<String> participants,
+            String templateId
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/EndMeetingUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/EndMeetingUseCase.java
new file mode 100644
index 0000000..900292a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/EndMeetingUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.meeting;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+/**
+ * 회의 종료 UseCase
+ */
+public interface EndMeetingUseCase {
+
+    /**
+     * 회의 종료
+     */
+    Meeting endMeeting(String meetingId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/GetMeetingUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/GetMeetingUseCase.java
new file mode 100644
index 0000000..e7467ff
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/GetMeetingUseCase.java
@@ -0,0 +1,37 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.meeting;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 회의 조회 UseCase
+ */
+public interface GetMeetingUseCase {
+
+    /**
+     * ID로 회의 조회
+     */
+    Meeting getMeeting(String meetingId);
+
+    /**
+     * 주최자 ID로 회의 목록 조회
+     */
+    List<Meeting> getMeetingsByOrganizer(String organizerId);
+
+    /**
+     * 상태로 회의 목록 조회
+     */
+    List<Meeting> getMeetingsByStatus(String status);
+
+    /**
+     * 일정 시간 범위로 회의 목록 조회
+     */
+    List<Meeting> getMeetingsByScheduledTime(LocalDateTime startTime, LocalDateTime endTime);
+
+    /**
+     * 주최자 ID와 상태로 회의 목록 조회
+     */
+    List<Meeting> getMeetingsByOrganizerAndStatus(String organizerId, String status);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/StartMeetingUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/StartMeetingUseCase.java
new file mode 100644
index 0000000..04e0c5d
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/meeting/StartMeetingUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.meeting;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+/**
+ * 회의 시작 UseCase
+ */
+public interface StartMeetingUseCase {
+
+    /**
+     * 회의 시작
+     */
+    Meeting startMeeting(String meetingId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/CreateMinutesUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/CreateMinutesUseCase.java
new file mode 100644
index 0000000..bbf0498
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/CreateMinutesUseCase.java
@@ -0,0 +1,23 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.minutes;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+/**
+ * 회의록 생성 UseCase
+ */
+public interface CreateMinutesUseCase {
+
+    /**
+     * 회의록 생성
+     */
+    Minutes createMinutes(CreateMinutesCommand command);
+
+    /**
+     * 회의록 생성 명령
+     */
+    record CreateMinutesCommand(
+            String meetingId,
+            String title,
+            String createdBy
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/FinalizeMinutesUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/FinalizeMinutesUseCase.java
new file mode 100644
index 0000000..9a60c41
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/FinalizeMinutesUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.minutes;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+/**
+ * 회의록 확정 UseCase
+ */
+public interface FinalizeMinutesUseCase {
+
+    /**
+     * 회의록 확정
+     */
+    Minutes finalizeMinutes(String minutesId, String userId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/GetMinutesUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/GetMinutesUseCase.java
new file mode 100644
index 0000000..bd6daa6
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/GetMinutesUseCase.java
@@ -0,0 +1,36 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.minutes;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+import java.util.List;
+
+/**
+ * 회의록 조회 UseCase
+ */
+public interface GetMinutesUseCase {
+
+    /**
+     * ID로 회의록 조회
+     */
+    Minutes getMinutes(String minutesId);
+
+    /**
+     * 회의 ID로 회의록 목록 조회
+     */
+    List<Minutes> getMinutesByMeeting(String meetingId);
+
+    /**
+     * 회의 ID로 최신 회의록 조회
+     */
+    Minutes getLatestMinutes(String meetingId);
+
+    /**
+     * 작성자 ID로 회의록 목록 조회
+     */
+    List<Minutes> getMinutesByCreator(String createdBy);
+
+    /**
+     * 상태로 회의록 목록 조회
+     */
+    List<Minutes> getMinutesByStatus(String status);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/UpdateMinutesUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/UpdateMinutesUseCase.java
new file mode 100644
index 0000000..890ca72
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/minutes/UpdateMinutesUseCase.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.minutes;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+/**
+ * 회의록 수정 UseCase
+ */
+public interface UpdateMinutesUseCase {
+
+    /**
+     * 회의록 제목 수정
+     */
+    Minutes updateMinutesTitle(String minutesId, String title);
+
+    /**
+     * 회의록 버전 증가
+     */
+    Minutes incrementVersion(String minutesId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/CreateSectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/CreateSectionUseCase.java
new file mode 100644
index 0000000..336ada8
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/CreateSectionUseCase.java
@@ -0,0 +1,25 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+/**
+ * 회의록 섹션 생성 UseCase
+ */
+public interface CreateSectionUseCase {
+
+    /**
+     * 섹션 생성
+     */
+    MinutesSection createSection(CreateSectionCommand command);
+
+    /**
+     * 섹션 생성 명령
+     */
+    record CreateSectionCommand(
+            String minutesId,
+            String type,
+            String title,
+            String content,
+            Integer order
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/DeleteSectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/DeleteSectionUseCase.java
new file mode 100644
index 0000000..7cb12a0
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/DeleteSectionUseCase.java
@@ -0,0 +1,12 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+/**
+ * 회의록 섹션 삭제 UseCase
+ */
+public interface DeleteSectionUseCase {
+
+    /**
+     * 섹션 삭제
+     */
+    void deleteSection(String sectionId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/GetSectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/GetSectionUseCase.java
new file mode 100644
index 0000000..a5e4524
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/GetSectionUseCase.java
@@ -0,0 +1,26 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+import java.util.List;
+
+/**
+ * 회의록 섹션 조회 UseCase
+ */
+public interface GetSectionUseCase {
+
+    /**
+     * ID로 섹션 조회
+     */
+    MinutesSection getSection(String sectionId);
+
+    /**
+     * 회의록 ID로 섹션 목록 조회 (순서대로)
+     */
+    List<MinutesSection> getSectionsByMinutes(String minutesId);
+
+    /**
+     * 회의록 ID와 타입으로 섹션 목록 조회
+     */
+    List<MinutesSection> getSectionsByMinutesAndType(String minutesId, String type);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/LockSectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/LockSectionUseCase.java
new file mode 100644
index 0000000..395e614
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/LockSectionUseCase.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+/**
+ * 회의록 섹션 잠금 UseCase
+ */
+public interface LockSectionUseCase {
+
+    /**
+     * 섹션 잠금
+     */
+    MinutesSection lockSection(String sectionId, String userId);
+
+    /**
+     * 섹션 잠금 해제
+     */
+    MinutesSection unlockSection(String sectionId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/UpdateSectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/UpdateSectionUseCase.java
new file mode 100644
index 0000000..2616bb8
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/UpdateSectionUseCase.java
@@ -0,0 +1,23 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+/**
+ * 회의록 섹션 수정 UseCase
+ */
+public interface UpdateSectionUseCase {
+
+    /**
+     * 섹션 내용 수정
+     */
+    MinutesSection updateSection(UpdateSectionCommand command);
+
+    /**
+     * 섹션 수정 명령
+     */
+    record UpdateSectionCommand(
+            String sectionId,
+            String title,
+            String content
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/VerifySectionUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/VerifySectionUseCase.java
new file mode 100644
index 0000000..c4100e5
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/section/VerifySectionUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.section;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+/**
+ * 회의록 섹션 검증 UseCase
+ */
+public interface VerifySectionUseCase {
+
+    /**
+     * 섹션 검증
+     */
+    MinutesSection verifySection(String sectionId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/CreateTemplateUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/CreateTemplateUseCase.java
new file mode 100644
index 0000000..f343ed1
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/CreateTemplateUseCase.java
@@ -0,0 +1,28 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.template;
+
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+
+import java.util.List;
+
+/**
+ * 템플릿 생성 UseCase
+ */
+public interface CreateTemplateUseCase {
+
+    /**
+     * 템플릿 생성
+     */
+    Template createTemplate(CreateTemplateCommand command);
+
+    /**
+     * 템플릿 생성 명령
+     */
+    record CreateTemplateCommand(
+            String name,
+            String description,
+            String category,
+            List<Template.TemplateSection> sections,
+            Boolean isPublic,
+            String createdBy
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/GetTemplateUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/GetTemplateUseCase.java
new file mode 100644
index 0000000..2e034ab
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/template/GetTemplateUseCase.java
@@ -0,0 +1,36 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.template;
+
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+
+import java.util.List;
+
+/**
+ * 템플릿 조회 UseCase
+ */
+public interface GetTemplateUseCase {
+
+    /**
+     * ID로 템플릿 조회
+     */
+    Template getTemplate(String templateId);
+
+    /**
+     * 카테고리로 템플릿 목록 조회
+     */
+    List<Template> getTemplatesByCategory(String category);
+
+    /**
+     * 공개 템플릿 목록 조회
+     */
+    List<Template> getPublicTemplates();
+
+    /**
+     * 작성자 ID로 템플릿 목록 조회
+     */
+    List<Template> getTemplatesByCreator(String createdBy);
+
+    /**
+     * 이름으로 템플릿 검색
+     */
+    List<Template> searchTemplatesByName(String name);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CancelTodoUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CancelTodoUseCase.java
new file mode 100644
index 0000000..1819d4c
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CancelTodoUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.todo;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+/**
+ * Todo 취소 UseCase
+ */
+public interface CancelTodoUseCase {
+
+    /**
+     * Todo 취소
+     */
+    Todo cancelTodo(String todoId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CompleteTodoUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CompleteTodoUseCase.java
new file mode 100644
index 0000000..3daecc4
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CompleteTodoUseCase.java
@@ -0,0 +1,14 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.todo;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+/**
+ * Todo 완료 UseCase
+ */
+public interface CompleteTodoUseCase {
+
+    /**
+     * Todo 완료
+     */
+    Todo completeTodo(String todoId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CreateTodoUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CreateTodoUseCase.java
new file mode 100644
index 0000000..e668b43
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/CreateTodoUseCase.java
@@ -0,0 +1,29 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.todo;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+import java.time.LocalDate;
+
+/**
+ * Todo 생성 UseCase
+ */
+public interface CreateTodoUseCase {
+
+    /**
+     * Todo 생성
+     */
+    Todo createTodo(CreateTodoCommand command);
+
+    /**
+     * Todo 생성 명령
+     */
+    record CreateTodoCommand(
+            String minutesId,
+            String meetingId,
+            String title,
+            String description,
+            String assigneeId,
+            LocalDate dueDate,
+            String priority
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/GetTodoUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/GetTodoUseCase.java
new file mode 100644
index 0000000..e478986
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/GetTodoUseCase.java
@@ -0,0 +1,42 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.todo;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+import java.time.LocalDate;
+import java.util.List;
+
+/**
+ * Todo 조회 UseCase
+ */
+public interface GetTodoUseCase {
+
+    /**
+     * ID로 Todo 조회
+     */
+    Todo getTodo(String todoId);
+
+    /**
+     * 회의 ID로 Todo 목록 조회
+     */
+    List<Todo> getTodosByMeeting(String meetingId);
+
+    /**
+     * 회의록 ID로 Todo 목록 조회
+     */
+    List<Todo> getTodosByMinutes(String minutesId);
+
+    /**
+     * 담당자 ID로 Todo 목록 조회
+     */
+    List<Todo> getTodosByAssignee(String assigneeId);
+
+    /**
+     * 담당자 ID와 상태로 Todo 목록 조회
+     */
+    List<Todo> getTodosByAssigneeAndStatus(String assigneeId, String status);
+
+    /**
+     * 담당자 ID와 마감일 범위로 Todo 목록 조회
+     */
+    List<Todo> getTodosByAssigneeAndDueDateRange(String assigneeId, LocalDate startDate, LocalDate endDate);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/UpdateTodoUseCase.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/UpdateTodoUseCase.java
new file mode 100644
index 0000000..dc9a4aa
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/in/todo/UpdateTodoUseCase.java
@@ -0,0 +1,28 @@
+package com.unicorn.hgzero.meeting.biz.usecase.in.todo;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+import java.time.LocalDate;
+
+/**
+ * Todo 수정 UseCase
+ */
+public interface UpdateTodoUseCase {
+
+    /**
+     * Todo 수정
+     */
+    Todo updateTodo(UpdateTodoCommand command);
+
+    /**
+     * Todo 수정 명령
+     */
+    record UpdateTodoCommand(
+            String todoId,
+            String title,
+            String description,
+            String assigneeId,
+            LocalDate dueDate,
+            String priority
+    ) {}
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/DashboardReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/DashboardReader.java
new file mode 100644
index 0000000..613d118
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/DashboardReader.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Dashboard;
+
+/**
+ * 대시보드 조회 Gateway Interface (Out Port)
+ */
+public interface DashboardReader {
+
+    /**
+     * 사용자 대시보드 조회
+     */
+    Dashboard getDashboardByUserId(String userId);
+
+    /**
+     * 사용자 대시보드 (기간 필터) 조회
+     */
+    Dashboard getDashboardByUserIdAndPeriod(String userId, String period);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingReader.java
new file mode 100644
index 0000000..00b432a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingReader.java
@@ -0,0 +1,43 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * 회의 조회 Gateway Interface (Out Port)
+ */
+public interface MeetingReader {
+
+    /**
+     * ID로 회의 조회
+     */
+    Optional<Meeting> findById(String meetingId);
+
+    /**
+     * 주최자 ID로 회의 목록 조회
+     */
+    List<Meeting> findByOrganizerId(String organizerId);
+
+    /**
+     * 상태로 회의 목록 조회
+     */
+    List<Meeting> findByStatus(String status);
+
+    /**
+     * 주최자 ID와 상태로 회의 목록 조회
+     */
+    List<Meeting> findByOrganizerIdAndStatus(String organizerId, String status);
+
+    /**
+     * 일정 시간 범위로 회의 목록 조회
+     */
+    List<Meeting> findByScheduledTimeBetween(LocalDateTime startTime, LocalDateTime endTime);
+
+    /**
+     * 템플릿 ID로 회의 목록 조회
+     */
+    List<Meeting> findByTemplateId(String templateId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingWriter.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingWriter.java
new file mode 100644
index 0000000..9fe3f1a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MeetingWriter.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+
+/**
+ * 회의 저장 Gateway Interface (Out Port)
+ */
+public interface MeetingWriter {
+
+    /**
+     * 회의 저장
+     */
+    Meeting save(Meeting meeting);
+
+    /**
+     * 회의 삭제
+     */
+    void delete(String meetingId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesReader.java
new file mode 100644
index 0000000..a88c06a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesReader.java
@@ -0,0 +1,42 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * 회의록 조회 Gateway Interface (Out Port)
+ */
+public interface MinutesReader {
+
+    /**
+     * ID로 회의록 조회
+     */
+    Optional<Minutes> findById(String minutesId);
+
+    /**
+     * 회의 ID로 회의록 목록 조회
+     */
+    List<Minutes> findByMeetingId(String meetingId);
+
+    /**
+     * 회의 ID로 최신 회의록 조회
+     */
+    Optional<Minutes> findLatestByMeetingId(String meetingId);
+
+    /**
+     * 작성자 ID로 회의록 목록 조회
+     */
+    List<Minutes> findByCreatedBy(String createdBy);
+
+    /**
+     * 상태로 회의록 목록 조회
+     */
+    List<Minutes> findByStatus(String status);
+
+    /**
+     * 확정자 ID로 회의록 목록 조회
+     */
+    List<Minutes> findByFinalizedBy(String finalizedBy);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionReader.java
new file mode 100644
index 0000000..f6459a9
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionReader.java
@@ -0,0 +1,42 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * 회의록 섹션 조회 Gateway Interface (Out Port)
+ */
+public interface MinutesSectionReader {
+
+    /**
+     * ID로 섹션 조회
+     */
+    Optional<MinutesSection> findById(String sectionId);
+
+    /**
+     * 회의록 ID로 섹션 목록 조회 (순서대로)
+     */
+    List<MinutesSection> findByMinutesIdOrderByOrder(String minutesId);
+
+    /**
+     * 회의록 ID와 타입으로 섹션 목록 조회
+     */
+    List<MinutesSection> findByMinutesIdAndType(String minutesId, String type);
+
+    /**
+     * 회의록 ID와 검증 여부로 섹션 목록 조회
+     */
+    List<MinutesSection> findByMinutesIdAndVerified(String minutesId, Boolean verified);
+
+    /**
+     * 회의록 ID와 잠금 여부로 섹션 목록 조회
+     */
+    List<MinutesSection> findByMinutesIdAndLocked(String minutesId, Boolean locked);
+
+    /**
+     * 잠금한 사용자 ID로 섹션 목록 조회
+     */
+    List<MinutesSection> findByLockedBy(String lockedBy);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionWriter.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionWriter.java
new file mode 100644
index 0000000..c7f6ce5
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesSectionWriter.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+
+/**
+ * 회의록 섹션 저장 Gateway Interface (Out Port)
+ */
+public interface MinutesSectionWriter {
+
+    /**
+     * 섹션 저장
+     */
+    MinutesSection save(MinutesSection section);
+
+    /**
+     * 섹션 삭제
+     */
+    void delete(String sectionId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesWriter.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesWriter.java
new file mode 100644
index 0000000..735ffbb
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/MinutesWriter.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+
+/**
+ * 회의록 저장 Gateway Interface (Out Port)
+ */
+public interface MinutesWriter {
+
+    /**
+     * 회의록 저장
+     */
+    Minutes save(Minutes minutes);
+
+    /**
+     * 회의록 삭제
+     */
+    void delete(String minutesId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateReader.java
new file mode 100644
index 0000000..6d972a5
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateReader.java
@@ -0,0 +1,42 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * 템플릿 조회 Gateway Interface (Out Port)
+ */
+public interface TemplateReader {
+
+    /**
+     * ID로 템플릿 조회
+     */
+    Optional<Template> findById(String templateId);
+
+    /**
+     * 카테고리로 템플릿 목록 조회
+     */
+    List<Template> findByCategory(String category);
+
+    /**
+     * 공개 여부로 템플릿 목록 조회
+     */
+    List<Template> findByIsPublic(Boolean isPublic);
+
+    /**
+     * 작성자 ID로 템플릿 목록 조회
+     */
+    List<Template> findByCreatedBy(String createdBy);
+
+    /**
+     * 카테고리와 공개 여부로 템플릿 목록 조회
+     */
+    List<Template> findByCategoryAndIsPublic(String category, Boolean isPublic);
+
+    /**
+     * 이름으로 템플릿 검색 (부분 일치)
+     */
+    List<Template> findByNameContaining(String name);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateWriter.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateWriter.java
new file mode 100644
index 0000000..145da29
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TemplateWriter.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+
+/**
+ * 템플릿 저장 Gateway Interface (Out Port)
+ */
+public interface TemplateWriter {
+
+    /**
+     * 템플릿 저장
+     */
+    Template save(Template template);
+
+    /**
+     * 템플릿 삭제
+     */
+    void delete(String templateId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoReader.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoReader.java
new file mode 100644
index 0000000..26a92f7
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoReader.java
@@ -0,0 +1,63 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Todo 조회 Gateway Interface (Out Port)
+ */
+public interface TodoReader {
+
+    /**
+     * ID로 Todo 조회
+     */
+    Optional<Todo> findById(String todoId);
+
+    /**
+     * 회의 ID로 Todo 목록 조회
+     */
+    List<Todo> findByMeetingId(String meetingId);
+
+    /**
+     * 회의록 ID로 Todo 목록 조회
+     */
+    List<Todo> findByMinutesId(String minutesId);
+
+    /**
+     * 담당자 ID로 Todo 목록 조회
+     */
+    List<Todo> findByAssigneeId(String assigneeId);
+
+    /**
+     * 상태로 Todo 목록 조회
+     */
+    List<Todo> findByStatus(String status);
+
+    /**
+     * 담당자 ID와 상태로 Todo 목록 조회
+     */
+    List<Todo> findByAssigneeIdAndStatus(String assigneeId, String status);
+
+    /**
+     * 마감일로 Todo 목록 조회
+     */
+    List<Todo> findByDueDate(LocalDate dueDate);
+
+    /**
+     * 마감일 이전 Todo 목록 조회
+     */
+    List<Todo> findByDueDateBefore(LocalDate date);
+
+    /**
+     * 우선순위로 Todo 목록 조회
+     */
+    List<Todo> findByPriority(String priority);
+
+    /**
+     * 담당자 ID와 마감일 범위로 Todo 목록 조회
+     */
+    List<Todo> findByAssigneeIdAndDueDateBetween(String assigneeId, LocalDate startDate, LocalDate endDate);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoWriter.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoWriter.java
new file mode 100644
index 0000000..eb50440
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/biz/usecase/out/TodoWriter.java
@@ -0,0 +1,19 @@
+package com.unicorn.hgzero.meeting.biz.usecase.out;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+
+/**
+ * Todo 저장 Gateway Interface (Out Port)
+ */
+public interface TodoWriter {
+
+    /**
+     * Todo 저장
+     */
+    Todo save(Todo todo);
+
+    /**
+     * Todo 삭제
+     */
+    void delete(String todoId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/DashboardGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/DashboardGateway.java
new file mode 100644
index 0000000..8e4a998
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/DashboardGateway.java
@@ -0,0 +1,160 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.Dashboard;
+import com.unicorn.hgzero.meeting.biz.usecase.out.DashboardReader;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.MeetingJpaRepository;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.MinutesJpaRepository;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.TodoJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+/**
+ * 대시보드 Gateway 구현체
+ * DashboardReader 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class DashboardGateway implements DashboardReader {
+
+    private final MeetingJpaRepository meetingJpaRepository;
+    private final MinutesJpaRepository minutesJpaRepository;
+    private final TodoJpaRepository todoJpaRepository;
+
+    @Override
+    public Dashboard getDashboardByUserId(String userId) {
+        log.debug("Getting dashboard for user: {}", userId);
+
+        // 회의 통계 조회
+        long totalMeetings = meetingJpaRepository.findByOrganizerId(userId).size();
+        long scheduledMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "SCHEDULED").size();
+        long inProgressMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "IN_PROGRESS").size();
+        long completedMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "COMPLETED").size();
+
+        // 회의록 통계 조회
+        long totalMinutes = minutesJpaRepository.findByCreatedBy(userId).size();
+        long draftMinutes = minutesJpaRepository.findByCreatedBy(userId).stream()
+                .filter(m -> "DRAFT".equals(m.getStatus()))
+                .count();
+        long finalizedMinutes = minutesJpaRepository.findByCreatedBy(userId).stream()
+                .filter(m -> "FINALIZED".equals(m.getStatus()))
+                .count();
+
+        // Todo 통계 조회
+        long totalTodos = todoJpaRepository.findByAssigneeId(userId).size();
+        long pendingTodos = todoJpaRepository.findByAssigneeIdAndStatus(userId, "PENDING").size();
+        long completedTodos = todoJpaRepository.findByAssigneeIdAndStatus(userId, "COMPLETED").size();
+        long overdueTodos = todoJpaRepository.findByAssigneeId(userId).stream()
+                .filter(todo -> todo.getDueDate() != null
+                        && LocalDate.now().isAfter(todo.getDueDate())
+                        && !"COMPLETED".equals(todo.getStatus()))
+                .count();
+
+        // 통계 객체 생성
+        Dashboard.Statistics statistics = new Dashboard.Statistics(
+                totalMeetings,
+                scheduledMeetings,
+                inProgressMeetings,
+                completedMeetings,
+                totalMinutes,
+                draftMinutes,
+                finalizedMinutes,
+                totalTodos,
+                pendingTodos,
+                completedTodos,
+                overdueTodos
+        );
+
+        // 대시보드 생성
+        return Dashboard.builder()
+                .userId(userId)
+                .statistics(statistics)
+                .build();
+    }
+
+    @Override
+    public Dashboard getDashboardByUserIdAndPeriod(String userId, String period) {
+        log.debug("Getting dashboard for user: {} with period: {}", userId, period);
+
+        // 기간 계산
+        LocalDateTime startTime = calculateStartTime(period);
+        LocalDateTime endTime = LocalDateTime.now();
+
+        // 기간 내 회의 통계 조회
+        long totalMeetings = meetingJpaRepository.findByOrganizerId(userId).stream()
+                .filter(m -> m.getScheduledAt().isAfter(startTime) && m.getScheduledAt().isBefore(endTime))
+                .count();
+
+        long scheduledMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "SCHEDULED").stream()
+                .filter(m -> m.getScheduledAt().isAfter(startTime) && m.getScheduledAt().isBefore(endTime))
+                .count();
+
+        long inProgressMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "IN_PROGRESS").stream()
+                .filter(m -> m.getScheduledAt().isAfter(startTime) && m.getScheduledAt().isBefore(endTime))
+                .count();
+
+        long completedMeetings = meetingJpaRepository.findByOrganizerIdAndStatus(userId, "COMPLETED").stream()
+                .filter(m -> m.getScheduledAt().isAfter(startTime) && m.getScheduledAt().isBefore(endTime))
+                .count();
+
+        // 회의록 통계 조회 (전체 기간)
+        long totalMinutes = minutesJpaRepository.findByCreatedBy(userId).size();
+        long draftMinutes = minutesJpaRepository.findByCreatedBy(userId).stream()
+                .filter(m -> "DRAFT".equals(m.getStatus()))
+                .count();
+        long finalizedMinutes = minutesJpaRepository.findByCreatedBy(userId).stream()
+                .filter(m -> "FINALIZED".equals(m.getStatus()))
+                .count();
+
+        // Todo 통계 조회 (전체 기간)
+        long totalTodos = todoJpaRepository.findByAssigneeId(userId).size();
+        long pendingTodos = todoJpaRepository.findByAssigneeIdAndStatus(userId, "PENDING").size();
+        long completedTodos = todoJpaRepository.findByAssigneeIdAndStatus(userId, "COMPLETED").size();
+        long overdueTodos = todoJpaRepository.findByAssigneeId(userId).stream()
+                .filter(todo -> todo.getDueDate() != null
+                        && LocalDate.now().isAfter(todo.getDueDate())
+                        && !"COMPLETED".equals(todo.getStatus()))
+                .count();
+
+        // 통계 객체 생성
+        Dashboard.Statistics statistics = new Dashboard.Statistics(
+                totalMeetings,
+                scheduledMeetings,
+                inProgressMeetings,
+                completedMeetings,
+                totalMinutes,
+                draftMinutes,
+                finalizedMinutes,
+                totalTodos,
+                pendingTodos,
+                completedTodos,
+                overdueTodos
+        );
+
+        // 대시보드 생성
+        return Dashboard.builder()
+                .userId(userId)
+                .period(period)
+                .statistics(statistics)
+                .build();
+    }
+
+    /**
+     * 기간 문자열로부터 시작 시간 계산
+     */
+    private LocalDateTime calculateStartTime(String period) {
+        LocalDateTime now = LocalDateTime.now();
+
+        return switch (period.toUpperCase()) {
+            case "WEEK" -> now.minusWeeks(1);
+            case "MONTH" -> now.minusMonths(1);
+            case "QUARTER" -> now.minusMonths(3);
+            case "YEAR" -> now.minusYears(1);
+            default -> now.minusMonths(1); // 기본값: 1개월
+        };
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MeetingGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MeetingGateway.java
new file mode 100644
index 0000000..15b410d
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MeetingGateway.java
@@ -0,0 +1,80 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MeetingReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MeetingWriter;
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MeetingEntity;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.MeetingJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * 회의 Gateway 구현체
+ * MeetingReader, MeetingWriter 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class MeetingGateway implements MeetingReader, MeetingWriter {
+
+    private final MeetingJpaRepository meetingJpaRepository;
+
+    @Override
+    public Optional<Meeting> findById(String meetingId) {
+        return meetingJpaRepository.findById(meetingId)
+                .map(MeetingEntity::toDomain);
+    }
+
+    @Override
+    public List<Meeting> findByOrganizerId(String organizerId) {
+        return meetingJpaRepository.findByOrganizerId(organizerId).stream()
+                .map(MeetingEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Meeting> findByStatus(String status) {
+        return meetingJpaRepository.findByStatus(status).stream()
+                .map(MeetingEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Meeting> findByOrganizerIdAndStatus(String organizerId, String status) {
+        return meetingJpaRepository.findByOrganizerIdAndStatus(organizerId, status).stream()
+                .map(MeetingEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Meeting> findByScheduledTimeBetween(LocalDateTime startTime, LocalDateTime endTime) {
+        return meetingJpaRepository.findByScheduledAtBetween(startTime, endTime).stream()
+                .map(MeetingEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Meeting> findByTemplateId(String templateId) {
+        return meetingJpaRepository.findByTemplateId(templateId).stream()
+                .map(MeetingEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Meeting save(Meeting meeting) {
+        MeetingEntity entity = MeetingEntity.fromDomain(meeting);
+        MeetingEntity savedEntity = meetingJpaRepository.save(entity);
+        return savedEntity.toDomain();
+    }
+
+    @Override
+    public void delete(String meetingId) {
+        meetingJpaRepository.deleteById(meetingId);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesGateway.java
new file mode 100644
index 0000000..58e2f5c
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesGateway.java
@@ -0,0 +1,78 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesWriter;
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MinutesEntity;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.MinutesJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * 회의록 Gateway 구현체
+ * MinutesReader, MinutesWriter 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class MinutesGateway implements MinutesReader, MinutesWriter {
+
+    private final MinutesJpaRepository minutesJpaRepository;
+
+    @Override
+    public Optional<Minutes> findById(String minutesId) {
+        return minutesJpaRepository.findById(minutesId)
+                .map(MinutesEntity::toDomain);
+    }
+
+    @Override
+    public List<Minutes> findByMeetingId(String meetingId) {
+        return minutesJpaRepository.findByMeetingId(meetingId).stream()
+                .map(MinutesEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Optional<Minutes> findLatestByMeetingId(String meetingId) {
+        return minutesJpaRepository.findFirstByMeetingIdOrderByVersionDesc(meetingId)
+                .map(MinutesEntity::toDomain);
+    }
+
+    @Override
+    public List<Minutes> findByCreatedBy(String createdBy) {
+        return minutesJpaRepository.findByCreatedBy(createdBy).stream()
+                .map(MinutesEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Minutes> findByStatus(String status) {
+        return minutesJpaRepository.findByStatus(status).stream()
+                .map(MinutesEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Minutes> findByFinalizedBy(String finalizedBy) {
+        return minutesJpaRepository.findByFinalizedBy(finalizedBy).stream()
+                .map(MinutesEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Minutes save(Minutes minutes) {
+        MinutesEntity entity = MinutesEntity.fromDomain(minutes);
+        MinutesEntity savedEntity = minutesJpaRepository.save(entity);
+        return savedEntity.toDomain();
+    }
+
+    @Override
+    public void delete(String minutesId) {
+        minutesJpaRepository.deleteById(minutesId);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesSectionGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesSectionGateway.java
new file mode 100644
index 0000000..7bcf72a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/MinutesSectionGateway.java
@@ -0,0 +1,79 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesSectionReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.MinutesSectionWriter;
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MinutesSectionEntity;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.MinutesSectionJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * 회의록 섹션 Gateway 구현체
+ * MinutesSectionReader, MinutesSectionWriter 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class MinutesSectionGateway implements MinutesSectionReader, MinutesSectionWriter {
+
+    private final MinutesSectionJpaRepository sectionJpaRepository;
+
+    @Override
+    public Optional<MinutesSection> findById(String sectionId) {
+        return sectionJpaRepository.findById(sectionId)
+                .map(MinutesSectionEntity::toDomain);
+    }
+
+    @Override
+    public List<MinutesSection> findByMinutesIdOrderByOrder(String minutesId) {
+        return sectionJpaRepository.findByMinutesIdOrderByOrderAsc(minutesId).stream()
+                .map(MinutesSectionEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<MinutesSection> findByMinutesIdAndType(String minutesId, String type) {
+        return sectionJpaRepository.findByMinutesIdAndType(minutesId, type).stream()
+                .map(MinutesSectionEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<MinutesSection> findByMinutesIdAndVerified(String minutesId, Boolean verified) {
+        return sectionJpaRepository.findByMinutesIdAndVerified(minutesId, verified).stream()
+                .map(MinutesSectionEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<MinutesSection> findByMinutesIdAndLocked(String minutesId, Boolean locked) {
+        return sectionJpaRepository.findByMinutesIdAndLocked(minutesId, locked).stream()
+                .map(MinutesSectionEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<MinutesSection> findByLockedBy(String lockedBy) {
+        return sectionJpaRepository.findByLockedBy(lockedBy).stream()
+                .map(MinutesSectionEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public MinutesSection save(MinutesSection section) {
+        MinutesSectionEntity entity = MinutesSectionEntity.fromDomain(section);
+        MinutesSectionEntity savedEntity = sectionJpaRepository.save(entity);
+        return savedEntity.toDomain();
+    }
+
+    @Override
+    public void delete(String sectionId) {
+        sectionJpaRepository.deleteById(sectionId);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TemplateGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TemplateGateway.java
new file mode 100644
index 0000000..ebab8a2
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TemplateGateway.java
@@ -0,0 +1,79 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.Template;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TemplateReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TemplateWriter;
+import com.unicorn.hgzero.meeting.infra.gateway.entity.TemplateEntity;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.TemplateJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * 템플릿 Gateway 구현체
+ * TemplateReader, TemplateWriter 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class TemplateGateway implements TemplateReader, TemplateWriter {
+
+    private final TemplateJpaRepository templateJpaRepository;
+
+    @Override
+    public Optional<Template> findById(String templateId) {
+        return templateJpaRepository.findById(templateId)
+                .map(TemplateEntity::toDomain);
+    }
+
+    @Override
+    public List<Template> findByCategory(String category) {
+        return templateJpaRepository.findByCategory(category).stream()
+                .map(TemplateEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Template> findByIsPublic(Boolean isPublic) {
+        return templateJpaRepository.findByIsPublic(isPublic).stream()
+                .map(TemplateEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Template> findByCreatedBy(String createdBy) {
+        return templateJpaRepository.findByCreatedBy(createdBy).stream()
+                .map(TemplateEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Template> findByCategoryAndIsPublic(String category, Boolean isPublic) {
+        return templateJpaRepository.findByCategoryAndIsPublic(category, isPublic).stream()
+                .map(TemplateEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Template> findByNameContaining(String name) {
+        return templateJpaRepository.findByNameContaining(name).stream()
+                .map(TemplateEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Template save(Template template) {
+        TemplateEntity entity = TemplateEntity.fromDomain(template);
+        TemplateEntity savedEntity = templateJpaRepository.save(entity);
+        return savedEntity.toDomain();
+    }
+
+    @Override
+    public void delete(String templateId) {
+        templateJpaRepository.deleteById(templateId);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TodoGateway.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TodoGateway.java
new file mode 100644
index 0000000..f25fe7a
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/TodoGateway.java
@@ -0,0 +1,108 @@
+package com.unicorn.hgzero.meeting.infra.gateway;
+
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TodoReader;
+import com.unicorn.hgzero.meeting.biz.usecase.out.TodoWriter;
+import com.unicorn.hgzero.meeting.infra.gateway.entity.TodoEntity;
+import com.unicorn.hgzero.meeting.infra.gateway.repository.TodoJpaRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * Todo Gateway 구현체
+ * TodoReader, TodoWriter 인터페이스 구현
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class TodoGateway implements TodoReader, TodoWriter {
+
+    private final TodoJpaRepository todoJpaRepository;
+
+    @Override
+    public Optional<Todo> findById(String todoId) {
+        return todoJpaRepository.findById(todoId)
+                .map(TodoEntity::toDomain);
+    }
+
+    @Override
+    public List<Todo> findByMeetingId(String meetingId) {
+        return todoJpaRepository.findByMeetingId(meetingId).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByMinutesId(String minutesId) {
+        return todoJpaRepository.findByMinutesId(minutesId).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByAssigneeId(String assigneeId) {
+        return todoJpaRepository.findByAssigneeId(assigneeId).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByStatus(String status) {
+        return todoJpaRepository.findByStatus(status).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByAssigneeIdAndStatus(String assigneeId, String status) {
+        return todoJpaRepository.findByAssigneeIdAndStatus(assigneeId, status).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByDueDate(LocalDate dueDate) {
+        return todoJpaRepository.findByDueDate(dueDate).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByDueDateBefore(LocalDate date) {
+        return todoJpaRepository.findByDueDateBefore(date).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByPriority(String priority) {
+        return todoJpaRepository.findByPriority(priority).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public List<Todo> findByAssigneeIdAndDueDateBetween(String assigneeId, LocalDate startDate, LocalDate endDate) {
+        return todoJpaRepository.findByAssigneeIdAndDueDateBetween(assigneeId, startDate, endDate).stream()
+                .map(TodoEntity::toDomain)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Todo save(Todo todo) {
+        TodoEntity entity = TodoEntity.fromDomain(todo);
+        TodoEntity savedEntity = todoJpaRepository.save(entity);
+        return savedEntity.toDomain();
+    }
+
+    @Override
+    public void delete(String todoId) {
+        todoJpaRepository.deleteById(todoId);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MeetingEntity.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MeetingEntity.java
new file mode 100644
index 0000000..ef5f082
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MeetingEntity.java
@@ -0,0 +1,112 @@
+package com.unicorn.hgzero.meeting.infra.gateway.entity;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import com.unicorn.hgzero.meeting.biz.domain.Meeting;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 회의 Entity
+ */
+@Entity
+@Table(name = "meetings")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class MeetingEntity extends BaseTimeEntity {
+
+    @Id
+    @Column(name = "meeting_id", length = 50)
+    private String meetingId;
+
+    @Column(name = "title", length = 200, nullable = false)
+    private String title;
+
+    @Column(name = "description", columnDefinition = "TEXT")
+    private String description;
+
+    @Column(name = "scheduled_at", nullable = false)
+    private LocalDateTime scheduledAt;
+
+    @Column(name = "started_at")
+    private LocalDateTime startedAt;
+
+    @Column(name = "ended_at")
+    private LocalDateTime endedAt;
+
+    @Column(name = "status", length = 20, nullable = false)
+    @Builder.Default
+    private String status = "SCHEDULED";
+
+    @Column(name = "organizer_id", length = 50, nullable = false)
+    private String organizerId;
+
+    @Column(name = "participants", columnDefinition = "TEXT")
+    private String participants;
+
+    @Column(name = "template_id", length = 50)
+    private String templateId;
+
+    public Meeting toDomain() {
+        return Meeting.builder()
+                .meetingId(this.meetingId)
+                .title(this.title)
+                .description(this.description)
+                .scheduledAt(this.scheduledAt)
+                .startedAt(this.startedAt)
+                .endedAt(this.endedAt)
+                .status(this.status)
+                .organizerId(this.organizerId)
+                .participants(parseParticipants(this.participants))
+                .templateId(this.templateId)
+                .build();
+    }
+
+    public static MeetingEntity fromDomain(Meeting meeting) {
+        return MeetingEntity.builder()
+                .meetingId(meeting.getMeetingId())
+                .title(meeting.getTitle())
+                .description(meeting.getDescription())
+                .scheduledAt(meeting.getScheduledAt())
+                .startedAt(meeting.getStartedAt())
+                .endedAt(meeting.getEndedAt())
+                .status(meeting.getStatus())
+                .organizerId(meeting.getOrganizerId())
+                .participants(formatParticipants(meeting.getParticipants()))
+                .templateId(meeting.getTemplateId())
+                .build();
+    }
+
+    public void start() {
+        this.status = "IN_PROGRESS";
+        this.startedAt = LocalDateTime.now();
+    }
+
+    public void end() {
+        this.status = "COMPLETED";
+        this.endedAt = LocalDateTime.now();
+    }
+
+    private static List<String> parseParticipants(String participants) {
+        if (participants == null || participants.isEmpty()) {
+            return List.of();
+        }
+        return Arrays.asList(participants.split(","));
+    }
+
+    private static String formatParticipants(List<String> participants) {
+        if (participants == null || participants.isEmpty()) {
+            return "";
+        }
+        return String.join(",", participants);
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesEntity.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesEntity.java
new file mode 100644
index 0000000..433cc73
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesEntity.java
@@ -0,0 +1,96 @@
+package com.unicorn.hgzero.meeting.infra.gateway.entity;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import com.unicorn.hgzero.meeting.biz.domain.Minutes;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 회의록 Entity
+ */
+@Entity
+@Table(name = "minutes")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class MinutesEntity extends BaseTimeEntity {
+
+    @Id
+    @Column(name = "minutes_id", length = 50)
+    private String minutesId;
+
+    @Column(name = "meeting_id", length = 50, nullable = false)
+    private String meetingId;
+
+    @Column(name = "title", length = 200, nullable = false)
+    private String title;
+
+    @OneToMany(mappedBy = "minutes", cascade = CascadeType.ALL, orphanRemoval = true)
+    @OrderBy("order ASC")
+    private List<MinutesSectionEntity> sections = new ArrayList<>();
+
+    @Column(name = "status", length = 20, nullable = false)
+    @Builder.Default
+    private String status = "DRAFT";
+
+    @Column(name = "version", nullable = false)
+    @Builder.Default
+    private Integer version = 1;
+
+    @Column(name = "created_by", length = 50, nullable = false)
+    private String createdBy;
+
+    @Column(name = "finalized_by", length = 50)
+    private String finalizedBy;
+
+    @Column(name = "finalized_at")
+    private LocalDateTime finalizedAt;
+
+    public Minutes toDomain() {
+        return Minutes.builder()
+                .minutesId(this.minutesId)
+                .meetingId(this.meetingId)
+                .title(this.title)
+                .sections(this.sections.stream()
+                        .map(MinutesSectionEntity::toDomain)
+                        .collect(Collectors.toList()))
+                .status(this.status)
+                .version(this.version)
+                .createdBy(this.createdBy)
+                .finalizedBy(this.finalizedBy)
+                .finalizedAt(this.finalizedAt)
+                .build();
+    }
+
+    public static MinutesEntity fromDomain(Minutes minutes) {
+        return MinutesEntity.builder()
+                .minutesId(minutes.getMinutesId())
+                .meetingId(minutes.getMeetingId())
+                .title(minutes.getTitle())
+                .status(minutes.getStatus())
+                .version(minutes.getVersion())
+                .createdBy(minutes.getCreatedBy())
+                .finalizedBy(minutes.getFinalizedBy())
+                .finalizedAt(minutes.getFinalizedAt())
+                .build();
+    }
+
+    public void finalize(String userId) {
+        this.status = "FINALIZED";
+        this.finalizedBy = userId;
+        this.finalizedAt = LocalDateTime.now();
+    }
+
+    public void updateVersion() {
+        this.version++;
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesSectionEntity.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesSectionEntity.java
new file mode 100644
index 0000000..2c409de
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/MinutesSectionEntity.java
@@ -0,0 +1,97 @@
+package com.unicorn.hgzero.meeting.infra.gateway.entity;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import com.unicorn.hgzero.meeting.biz.domain.MinutesSection;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 회의록 섹션 Entity
+ */
+@Entity
+@Table(name = "minutes_sections")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class MinutesSectionEntity extends BaseTimeEntity {
+
+    @Id
+    @Column(name = "section_id", length = 50)
+    private String sectionId;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "minutes_id", nullable = false)
+    private MinutesEntity minutes;
+
+    @Column(name = "minutes_id", insertable = false, updatable = false)
+    private String minutesId;
+
+    @Column(name = "type", length = 50, nullable = false)
+    private String type;
+
+    @Column(name = "title", length = 200, nullable = false)
+    private String title;
+
+    @Column(name = "content", columnDefinition = "TEXT")
+    private String content;
+
+    @Column(name = "order", nullable = false)
+    private Integer order;
+
+    @Column(name = "verified", nullable = false)
+    @Builder.Default
+    private Boolean verified = false;
+
+    @Column(name = "locked", nullable = false)
+    @Builder.Default
+    private Boolean locked = false;
+
+    @Column(name = "locked_by", length = 50)
+    private String lockedBy;
+
+    public MinutesSection toDomain() {
+        return MinutesSection.builder()
+                .sectionId(this.sectionId)
+                .minutesId(this.minutesId)
+                .type(this.type)
+                .title(this.title)
+                .content(this.content)
+                .order(this.order)
+                .verified(this.verified)
+                .locked(this.locked)
+                .lockedBy(this.lockedBy)
+                .build();
+    }
+
+    public static MinutesSectionEntity fromDomain(MinutesSection section) {
+        return MinutesSectionEntity.builder()
+                .sectionId(section.getSectionId())
+                .minutesId(section.getMinutesId())
+                .type(section.getType())
+                .title(section.getTitle())
+                .content(section.getContent())
+                .order(section.getOrder())
+                .verified(section.getVerified())
+                .locked(section.getLocked())
+                .lockedBy(section.getLockedBy())
+                .build();
+    }
+
+    public void lock(String userId) {
+        this.locked = true;
+        this.lockedBy = userId;
+    }
+
+    public void unlock() {
+        this.locked = false;
+        this.lockedBy = null;
+    }
+
+    public void verify() {
+        this.verified = true;
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TemplateEntity.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TemplateEntity.java
new file mode 100644
index 0000000..1100c12
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TemplateEntity.java
@@ -0,0 +1,65 @@
+package com.unicorn.hgzero.meeting.biz.domain;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 템플릿 Entity
+ */
+@Entity
+@Table(name = "templates")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class TemplateEntity extends BaseTimeEntity {
+
+    @Id
+    @Column(name = "template_id", length = 50)
+    private String templateId;
+
+    @Column(name = "name", length = 200, nullable = false)
+    private String name;
+
+    @Column(name = "description", columnDefinition = "TEXT")
+    private String description;
+
+    @Column(name = "category", length = 50, nullable = false)
+    private String category;
+
+    @Column(name = "sections", columnDefinition = "TEXT")
+    private String sections;
+
+    @Column(name = "is_public", nullable = false)
+    @Builder.Default
+    private Boolean isPublic = true;
+
+    @Column(name = "created_by", length = 50, nullable = false)
+    private String createdBy;
+
+    public Template toDomain() {
+        return Template.builder()
+                .templateId(this.templateId)
+                .name(this.name)
+                .description(this.description)
+                .category(this.category)
+                .isPublic(this.isPublic)
+                .createdBy(this.createdBy)
+                .build();
+    }
+
+    public static TemplateEntity fromDomain(Template template) {
+        return TemplateEntity.builder()
+                .templateId(template.getTemplateId())
+                .name(template.getName())
+                .description(template.getDescription())
+                .category(template.getCategory())
+                .isPublic(template.getIsPublic())
+                .createdBy(template.getCreatedBy())
+                .build();
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TodoEntity.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TodoEntity.java
new file mode 100644
index 0000000..ea4beb4
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/entity/TodoEntity.java
@@ -0,0 +1,92 @@
+package com.unicorn.hgzero.meeting.infra.gateway.entity;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import com.unicorn.hgzero.meeting.biz.domain.Todo;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+/**
+ * Todo Entity
+ */
+@Entity
+@Table(name = "todos")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class TodoEntity extends BaseTimeEntity {
+
+    @Id
+    @Column(name = "todo_id", length = 50)
+    private String todoId;
+
+    @Column(name = "minutes_id", length = 50)
+    private String minutesId;
+
+    @Column(name = "meeting_id", length = 50, nullable = false)
+    private String meetingId;
+
+    @Column(name = "title", length = 200, nullable = false)
+    private String title;
+
+    @Column(name = "description", columnDefinition = "TEXT")
+    private String description;
+
+    @Column(name = "assignee_id", length = 50, nullable = false)
+    private String assigneeId;
+
+    @Column(name = "due_date")
+    private LocalDate dueDate;
+
+    @Column(name = "status", length = 20, nullable = false)
+    @Builder.Default
+    private String status = "PENDING";
+
+    @Column(name = "priority", length = 20)
+    @Builder.Default
+    private String priority = "MEDIUM";
+
+    @Column(name = "completed_at")
+    private LocalDateTime completedAt;
+
+    public Todo toDomain() {
+        return Todo.builder()
+                .todoId(this.todoId)
+                .minutesId(this.minutesId)
+                .meetingId(this.meetingId)
+                .title(this.title)
+                .description(this.description)
+                .assigneeId(this.assigneeId)
+                .dueDate(this.dueDate)
+                .status(this.status)
+                .priority(this.priority)
+                .completedAt(this.completedAt)
+                .build();
+    }
+
+    public static TodoEntity fromDomain(Todo todo) {
+        return TodoEntity.builder()
+                .todoId(todo.getTodoId())
+                .minutesId(todo.getMinutesId())
+                .meetingId(todo.getMeetingId())
+                .title(todo.getTitle())
+                .description(todo.getDescription())
+                .assigneeId(todo.getAssigneeId())
+                .dueDate(todo.getDueDate())
+                .status(todo.getStatus())
+                .priority(todo.getPriority())
+                .completedAt(todo.getCompletedAt())
+                .build();
+    }
+
+    public void complete() {
+        this.status = "COMPLETED";
+        this.completedAt = LocalDateTime.now();
+    }
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MeetingJpaRepository.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MeetingJpaRepository.java
new file mode 100644
index 0000000..0b081b9
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MeetingJpaRepository.java
@@ -0,0 +1,40 @@
+package com.unicorn.hgzero.meeting.infra.gateway.repository;
+
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MeetingEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 회의 JPA Repository
+ */
+@Repository
+public interface MeetingJpaRepository extends JpaRepository<MeetingEntity, String> {
+
+    /**
+     * 주최자 ID로 회의 목록 조회
+     */
+    List<MeetingEntity> findByOrganizerId(String organizerId);
+
+    /**
+     * 상태로 회의 목록 조회
+     */
+    List<MeetingEntity> findByStatus(String status);
+
+    /**
+     * 주최자 ID와 상태로 회의 목록 조회
+     */
+    List<MeetingEntity> findByOrganizerIdAndStatus(String organizerId, String status);
+
+    /**
+     * 일정 시간 범위로 회의 목록 조회
+     */
+    List<MeetingEntity> findByScheduledAtBetween(LocalDateTime startTime, LocalDateTime endTime);
+
+    /**
+     * 템플릿 ID로 회의 목록 조회
+     */
+    List<MeetingEntity> findByTemplateId(String templateId);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesJpaRepository.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesJpaRepository.java
new file mode 100644
index 0000000..4fd50dc
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesJpaRepository.java
@@ -0,0 +1,45 @@
+package com.unicorn.hgzero.meeting.infra.gateway.repository;
+
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MinutesEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * 회의록 JPA Repository
+ */
+@Repository
+public interface MinutesJpaRepository extends JpaRepository<MinutesEntity, String> {
+
+    /**
+     * 회의 ID로 회의록 조회
+     */
+    List<MinutesEntity> findByMeetingId(String meetingId);
+
+    /**
+     * 회의 ID로 최신 회의록 조회
+     */
+    Optional<MinutesEntity> findFirstByMeetingIdOrderByVersionDesc(String meetingId);
+
+    /**
+     * 상태로 회의록 목록 조회
+     */
+    List<MinutesEntity> findByStatus(String status);
+
+    /**
+     * 작성자 ID로 회의록 목록 조회
+     */
+    List<MinutesEntity> findByCreatedBy(String createdBy);
+
+    /**
+     * 확정자 ID로 회의록 목록 조회
+     */
+    List<MinutesEntity> findByFinalizedBy(String finalizedBy);
+
+    /**
+     * 회의 ID와 버전으로 회의록 조회
+     */
+    Optional<MinutesEntity> findByMeetingIdAndVersion(String meetingId, Integer version);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesSectionJpaRepository.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesSectionJpaRepository.java
new file mode 100644
index 0000000..24ebde7
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/MinutesSectionJpaRepository.java
@@ -0,0 +1,39 @@
+package com.unicorn.hgzero.meeting.infra.gateway.repository;
+
+import com.unicorn.hgzero.meeting.infra.gateway.entity.MinutesSectionEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+/**
+ * 회의록 섹션 JPA Repository
+ */
+@Repository
+public interface MinutesSectionJpaRepository extends JpaRepository<MinutesSectionEntity, String> {
+
+    /**
+     * 회의록 ID로 섹션 목록 조회 (순서대로)
+     */
+    List<MinutesSectionEntity> findByMinutesIdOrderByOrderAsc(String minutesId);
+
+    /**
+     * 회의록 ID와 타입으로 섹션 목록 조회
+     */
+    List<MinutesSectionEntity> findByMinutesIdAndType(String minutesId, String type);
+
+    /**
+     * 회의록 ID와 검증 여부로 섹션 목록 조회
+     */
+    List<MinutesSectionEntity> findByMinutesIdAndVerified(String minutesId, Boolean verified);
+
+    /**
+     * 회의록 ID와 잠금 여부로 섹션 목록 조회
+     */
+    List<MinutesSectionEntity> findByMinutesIdAndLocked(String minutesId, Boolean locked);
+
+    /**
+     * 잠금한 사용자 ID로 섹션 목록 조회
+     */
+    List<MinutesSectionEntity> findByLockedBy(String lockedBy);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TemplateJpaRepository.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TemplateJpaRepository.java
new file mode 100644
index 0000000..623815b
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TemplateJpaRepository.java
@@ -0,0 +1,39 @@
+package com.unicorn.hgzero.meeting.infra.gateway.repository;
+
+import com.unicorn.hgzero.meeting.infra.gateway.entity.TemplateEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+/**
+ * 템플릿 JPA Repository
+ */
+@Repository
+public interface TemplateJpaRepository extends JpaRepository<TemplateEntity, String> {
+
+    /**
+     * 카테고리로 템플릿 목록 조회
+     */
+    List<TemplateEntity> findByCategory(String category);
+
+    /**
+     * 공개 여부로 템플릿 목록 조회
+     */
+    List<TemplateEntity> findByIsPublic(Boolean isPublic);
+
+    /**
+     * 작성자 ID로 템플릿 목록 조회
+     */
+    List<TemplateEntity> findByCreatedBy(String createdBy);
+
+    /**
+     * 카테고리와 공개 여부로 템플릿 목록 조회
+     */
+    List<TemplateEntity> findByCategoryAndIsPublic(String category, Boolean isPublic);
+
+    /**
+     * 이름으로 템플릿 검색 (부분 일치)
+     */
+    List<TemplateEntity> findByNameContaining(String name);
+}
diff --git a/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TodoJpaRepository.java b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TodoJpaRepository.java
new file mode 100644
index 0000000..ad8811e
--- /dev/null
+++ b/meeting/src/main/java/com/unicorn/hgzero/meeting/infra/gateway/repository/TodoJpaRepository.java
@@ -0,0 +1,60 @@
+package com.unicorn.hgzero.meeting.infra.gateway.repository;
+
+import com.unicorn.hgzero.meeting.infra.gateway.entity.TodoEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.time.LocalDate;
+import java.util.List;
+
+/**
+ * Todo JPA Repository
+ */
+@Repository
+public interface TodoJpaRepository extends JpaRepository<TodoEntity, String> {
+
+    /**
+     * 회의 ID로 Todo 목록 조회
+     */
+    List<TodoEntity> findByMeetingId(String meetingId);
+
+    /**
+     * 회의록 ID로 Todo 목록 조회
+     */
+    List<TodoEntity> findByMinutesId(String minutesId);
+
+    /**
+     * 담당자 ID로 Todo 목록 조회
+     */
+    List<TodoEntity> findByAssigneeId(String assigneeId);
+
+    /**
+     * 상태로 Todo 목록 조회
+     */
+    List<TodoEntity> findByStatus(String status);
+
+    /**
+     * 담당자 ID와 상태로 Todo 목록 조회
+     */
+    List<TodoEntity> findByAssigneeIdAndStatus(String assigneeId, String status);
+
+    /**
+     * 마감일로 Todo 목록 조회
+     */
+    List<TodoEntity> findByDueDate(LocalDate dueDate);
+
+    /**
+     * 마감일 이전 Todo 목록 조회
+     */
+    List<TodoEntity> findByDueDateBefore(LocalDate date);
+
+    /**
+     * 우선순위로 Todo 목록 조회
+     */
+    List<TodoEntity> findByPriority(String priority);
+
+    /**
+     * 담당자 ID와 마감일 범위로 Todo 목록 조회
+     */
+    List<TodoEntity> findByAssigneeIdAndDueDateBetween(String assigneeId, LocalDate startDate, LocalDate endDate);
+}
diff --git a/meeting/src/main/resources/application.yml b/meeting/src/main/resources/application.yml
new file mode 100644
index 0000000..997976c
--- /dev/null
+++ b/meeting/src/main/resources/application.yml
@@ -0,0 +1,98 @@
+spring:
+  application:
+    name: meeting
+
+  # Database Configuration
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:4.230.48.72}:${DB_PORT:5432}/${DB_NAME:meetingdb}
+    username: ${DB_USERNAME:hgzerouser}
+    password: ${DB_PASSWORD:}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000
+
+  # JPA Configuration
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+
+  # Redis Configuration
+  data:
+    redis:
+      host: ${REDIS_HOST:20.249.177.114}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:1}
+
+# Server Configuration
+server:
+  port: ${SERVER_PORT:8081}
+
+# JWT Configuration
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# Actuator Configuration
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging Configuration
+logging:
+  level:
+    com.unicorn.hgzero.meeting: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:DEBUG}
+    org.springframework.websocket: ${LOG_LEVEL_WEBSOCKET:DEBUG}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/meeting.log}
diff --git a/notification/build.gradle b/notification/build.gradle
new file mode 100644
index 0000000..4e49eed
--- /dev/null
+++ b/notification/build.gradle
@@ -0,0 +1,14 @@
+bootJar {
+    archiveFileName = 'notification.jar'
+}
+
+dependencies {
+    // Email
+    implementation 'org.springframework.boot:spring-boot-starter-mail'
+
+    // Thymeleaf for email templates
+    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+
+    // Azure Event Hubs
+    implementation "com.azure:azure-messaging-eventhubs:${azureEventHubsVersion}"
+}
diff --git a/notification/src/main/resources/application.yml b/notification/src/main/resources/application.yml
new file mode 100644
index 0000000..fabd4f3
--- /dev/null
+++ b/notification/src/main/resources/application.yml
@@ -0,0 +1,139 @@
+spring:
+  application:
+    name: notification
+
+  # Database Configuration
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:4.230.159.143}:${DB_PORT:5432}/${DB_NAME:notificationdb}
+    username: ${DB_USERNAME:hgzerouser}
+    password: ${DB_PASSWORD:}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000
+
+  # JPA Configuration
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+
+  # Redis Configuration
+  data:
+    redis:
+      host: ${REDIS_HOST:20.249.177.114}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:4}
+
+  # Mail Configuration
+  mail:
+    host: ${MAIL_HOST:smtp.gmail.com}
+    port: ${MAIL_PORT:587}
+    username: ${MAIL_USERNAME:}
+    password: ${MAIL_PASSWORD:}
+    properties:
+      mail:
+        smtp:
+          auth: true
+          starttls:
+            enable: true
+            required: true
+          connectiontimeout: 5000
+          timeout: 5000
+          writetimeout: 5000
+
+  # Thymeleaf Configuration
+  thymeleaf:
+    prefix: classpath:/templates/
+    suffix: .html
+    mode: HTML
+    encoding: UTF-8
+    cache: false
+
+# Server Configuration
+server:
+  port: ${SERVER_PORT:8084}
+
+# JWT Configuration
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# Azure Event Hubs Configuration
+azure:
+  eventhub:
+    connection-string: ${AZURE_EVENTHUB_CONNECTION_STRING:}
+    name: ${AZURE_EVENTHUB_NAME:notification-events}
+    consumer-group: ${AZURE_EVENTHUB_CONSUMER_GROUP:$Default}
+
+# Notification Configuration
+notification:
+  from-email: ${NOTIFICATION_FROM_EMAIL:noreply@hgzero.com}
+  from-name: ${NOTIFICATION_FROM_NAME:HGZero}
+  retry:
+    max-attempts: ${NOTIFICATION_RETRY_MAX_ATTEMPTS:3}
+    initial-interval: ${NOTIFICATION_RETRY_INITIAL_INTERVAL:1000}
+    multiplier: ${NOTIFICATION_RETRY_MULTIPLIER:2.0}
+
+# Actuator Configuration
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging Configuration
+logging:
+  level:
+    com.unicorn.hgzero.notification: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:DEBUG}
+    org.springframework.mail: ${LOG_LEVEL_MAIL:DEBUG}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/notification.log}
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..876b850
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,8 @@
+rootProject.name = 'hgzero'
+
+include 'common'
+include 'user'
+include 'meeting'
+include 'stt'
+include 'ai'
+include 'notification'
diff --git a/stt/build.gradle b/stt/build.gradle
new file mode 100644
index 0000000..d1c1033
--- /dev/null
+++ b/stt/build.gradle
@@ -0,0 +1,17 @@
+bootJar {
+    archiveFileName = 'stt.jar'
+}
+
+dependencies {
+    // Azure Speech SDK
+    implementation "com.microsoft.cognitiveservices.speech:client-sdk:${azureSpeechVersion}"
+
+    // Azure Blob Storage
+    implementation "com.azure:azure-storage-blob:${azureBlobVersion}"
+
+    // Azure Event Hubs
+    implementation "com.azure:azure-messaging-eventhubs:${azureEventHubsVersion}"
+
+    // WebSocket
+    implementation 'org.springframework.boot:spring-boot-starter-websocket'
+}
diff --git a/stt/src/main/resources/application.yml b/stt/src/main/resources/application.yml
new file mode 100644
index 0000000..85064ed
--- /dev/null
+++ b/stt/src/main/resources/application.yml
@@ -0,0 +1,112 @@
+spring:
+  application:
+    name: stt
+
+  # Database Configuration
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:4.230.65.89}:${DB_PORT:5432}/${DB_NAME:sttdb}
+    username: ${DB_USERNAME:hgzerouser}
+    password: ${DB_PASSWORD:}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000
+
+  # JPA Configuration
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+
+  # Redis Configuration
+  data:
+    redis:
+      host: ${REDIS_HOST:20.249.177.114}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:2}
+
+# Server Configuration
+server:
+  port: ${SERVER_PORT:8082}
+
+# JWT Configuration
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# Azure Speech Service Configuration
+azure:
+  speech:
+    subscription-key: ${AZURE_SPEECH_SUBSCRIPTION_KEY:}
+    region: ${AZURE_SPEECH_REGION:eastus}
+    language: ${AZURE_SPEECH_LANGUAGE:ko-KR}
+  blob:
+    connection-string: ${AZURE_BLOB_CONNECTION_STRING:}
+    container-name: ${AZURE_BLOB_CONTAINER_NAME:recordings}
+  eventhub:
+    connection-string: ${AZURE_EVENTHUB_CONNECTION_STRING:}
+    name: ${AZURE_EVENTHUB_NAME:transcription-events}
+    consumer-group: ${AZURE_EVENTHUB_CONSUMER_GROUP:$Default}
+
+# Actuator Configuration
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging Configuration
+logging:
+  level:
+    com.unicorn.hgzero.stt: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:DEBUG}
+    org.springframework.websocket: ${LOG_LEVEL_WEBSOCKET:DEBUG}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/stt.log}
diff --git a/user/build.gradle b/user/build.gradle
new file mode 100644
index 0000000..b03a00f
--- /dev/null
+++ b/user/build.gradle
@@ -0,0 +1,9 @@
+bootJar {
+    archiveFileName = 'user.jar'
+}
+
+dependencies {
+    // LDAP
+    implementation 'org.springframework.boot:spring-boot-starter-data-ldap'
+    implementation 'org.springframework.ldap:spring-ldap-core'
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/UserApplication.java b/user/src/main/java/com/unicorn/hgzero/user/UserApplication.java
new file mode 100644
index 0000000..360c531
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/UserApplication.java
@@ -0,0 +1,18 @@
+package com.unicorn.hgzero.user;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+/**
+ * User Service Application
+ * 사용자 인증 서비스 메인 클래스
+ */
+@SpringBootApplication
+@ComponentScan(basePackages = {"com.unicorn.hgzero.user", "com.unicorn.hgzero.common"})
+public class UserApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(UserApplication.java, args);
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/config/SecurityConfig.java b/user/src/main/java/com/unicorn/hgzero/user/config/SecurityConfig.java
new file mode 100644
index 0000000..88cba25
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/config/SecurityConfig.java
@@ -0,0 +1,85 @@
+package com.unicorn.hgzero.user.config;
+
+import com.unicorn.hgzero.user.config.jwt.JwtAuthenticationFilter;
+import com.unicorn.hgzero.user.config.jwt.JwtTokenProvider;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+
+import java.util.Arrays;
+
+/**
+ * Spring Security 설정
+ * JWT 기반 인증 및 API 보안 설정
+ */
+@Configuration
+@EnableWebSecurity
+@RequiredArgsConstructor
+public class SecurityConfig {
+
+    private final JwtTokenProvider jwtTokenProvider;
+
+    @Value("${cors.allowed-origins:http://localhost:*}")
+    private String allowedOrigins;
+
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        return http
+                .csrf(AbstractHttpConfigurer::disable)
+                .cors(cors -> cors.configurationSource(corsConfigurationSource()))
+                .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
+                .authorizeHttpRequests(auth -> auth
+                        // Public endpoints
+                        .requestMatchers("/api/v1/auth/login").permitAll()
+                        // Actuator endpoints
+                        .requestMatchers("/actuator/**").permitAll()
+                        // Swagger UI endpoints
+                        .requestMatchers("/swagger-ui/**", "/swagger-ui.html", "/v3/api-docs/**", "/swagger-resources/**", "/webjars/**").permitAll()
+                        // Health check
+                        .requestMatchers("/health").permitAll()
+                        // All other requests require authentication
+                        .anyRequest().authenticated()
+                )
+                .addFilterBefore(new JwtAuthenticationFilter(jwtTokenProvider),
+                                UsernamePasswordAuthenticationFilter.class)
+                .build();
+    }
+
+    @Bean
+    public CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration configuration = new CorsConfiguration();
+
+        // 환경변수에서 허용할 Origin 패턴 설정
+        String[] origins = allowedOrigins.split(",");
+        configuration.setAllowedOriginPatterns(Arrays.asList(origins));
+
+        // 허용할 HTTP 메소드
+        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"));
+
+        // 허용할 헤더
+        configuration.setAllowedHeaders(Arrays.asList(
+            "Authorization", "Content-Type", "X-Requested-With", "Accept",
+            "Origin", "Access-Control-Request-Method", "Access-Control-Request-Headers"
+        ));
+
+        // 자격 증명 허용
+        configuration.setAllowCredentials(true);
+
+        // Pre-flight 요청 캐시 시간
+        configuration.setMaxAge(3600L);
+
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/**", configuration);
+        return source;
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/config/SwaggerConfig.java b/user/src/main/java/com/unicorn/hgzero/user/config/SwaggerConfig.java
new file mode 100644
index 0000000..2c8cb73
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/config/SwaggerConfig.java
@@ -0,0 +1,63 @@
+package com.unicorn.hgzero.user.config;
+
+import io.swagger.v3.oas.models.Components;
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.info.Contact;
+import io.swagger.v3.oas.models.info.Info;
+import io.swagger.v3.oas.models.security.SecurityRequirement;
+import io.swagger.v3.oas.models.security.SecurityScheme;
+import io.swagger.v3.oas.models.servers.Server;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Swagger/OpenAPI 설정
+ * User Service API 문서화를 위한 설정
+ */
+@Configuration
+public class SwaggerConfig {
+
+    @Bean
+    public OpenAPI openAPI() {
+        return new OpenAPI()
+                .info(apiInfo())
+                .addServersItem(new Server()
+                        .url("http://localhost:8080")
+                        .description("Local Development"))
+                .addServersItem(new Server()
+                        .url("{protocol}://{host}:{port}")
+                        .description("Custom Server")
+                        .variables(new io.swagger.v3.oas.models.servers.ServerVariables()
+                                .addServerVariable("protocol", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("http")
+                                        .description("Protocol (http or https)")
+                                        .addEnumItem("http")
+                                        .addEnumItem("https"))
+                                .addServerVariable("host", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("localhost")
+                                        .description("Server host"))
+                                .addServerVariable("port", new io.swagger.v3.oas.models.servers.ServerVariable()
+                                        ._default("8080")
+                                        .description("Server port"))))
+                .addSecurityItem(new SecurityRequirement().addList("Bearer Authentication"))
+                .components(new Components()
+                        .addSecuritySchemes("Bearer Authentication", createAPIKeyScheme()));
+    }
+
+    private Info apiInfo() {
+        return new Info()
+                .title("User Service API")
+                .description("사용자 인증 및 JWT 토큰 관리 API")
+                .version("1.0.0")
+                .contact(new Contact()
+                        .name("HGZero Development Team")
+                        .email("dev@hgzero.com"));
+    }
+
+    private SecurityScheme createAPIKeyScheme() {
+        return new SecurityScheme()
+                .type(SecurityScheme.Type.HTTP)
+                .bearerFormat("JWT")
+                .scheme("bearer");
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtAuthenticationFilter.java b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtAuthenticationFilter.java
new file mode 100644
index 0000000..a404102
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtAuthenticationFilter.java
@@ -0,0 +1,86 @@
+package com.unicorn.hgzero.user.config.jwt;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
+import org.springframework.util.StringUtils;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+import java.util.Collections;
+
+/**
+ * JWT 인증 필터
+ * HTTP 요청에서 JWT 토큰을 추출하여 인증을 수행
+ */
+@Slf4j
+@RequiredArgsConstructor
+public class JwtAuthenticationFilter extends OncePerRequestFilter {
+
+    private final JwtTokenProvider jwtTokenProvider;
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request,
+                                  HttpServletResponse response,
+                                  FilterChain filterChain) throws ServletException, IOException {
+
+        String token = jwtTokenProvider.resolveToken(request);
+
+        if (StringUtils.hasText(token) && jwtTokenProvider.validateToken(token)) {
+            String userId = jwtTokenProvider.getUserId(token);
+            String username = null;
+            String authority = null;
+
+            try {
+                username = jwtTokenProvider.getUsername(token);
+            } catch (Exception e) {
+                log.debug("JWT에 username 클레임이 없음: {}", e.getMessage());
+            }
+
+            try {
+                authority = jwtTokenProvider.getAuthority(token);
+            } catch (Exception e) {
+                log.debug("JWT에 authority 클레임이 없음: {}", e.getMessage());
+            }
+
+            if (StringUtils.hasText(userId)) {
+                // UserPrincipal 객체 생성 (username과 authority가 없어도 동작)
+                UserPrincipal userPrincipal = UserPrincipal.builder()
+                    .userId(userId)
+                    .username(username != null ? username : "unknown")
+                    .authority(authority != null ? authority : "USER")
+                    .build();
+
+                UsernamePasswordAuthenticationToken authentication =
+                    new UsernamePasswordAuthenticationToken(
+                        userPrincipal,
+                        null,
+                        Collections.singletonList(new SimpleGrantedAuthority(authority != null ? authority : "USER"))
+                    );
+
+                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
+                SecurityContextHolder.getContext().setAuthentication(authentication);
+
+                log.debug("인증된 사용자: {} ({})", userPrincipal.getUsername(), userId);
+            }
+        }
+
+        filterChain.doFilter(request, response);
+    }
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) {
+        String path = request.getRequestURI();
+        return path.startsWith("/actuator") ||
+               path.startsWith("/swagger-ui") ||
+               path.startsWith("/v3/api-docs") ||
+               path.equals("/health");
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtTokenProvider.java b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtTokenProvider.java
new file mode 100644
index 0000000..795ea30
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/JwtTokenProvider.java
@@ -0,0 +1,133 @@
+package com.unicorn.hgzero.user.config.jwt;
+
+import io.jsonwebtoken.*;
+import io.jsonwebtoken.security.Keys;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+import org.springframework.util.StringUtils;
+
+import javax.crypto.SecretKey;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+/**
+ * JWT 토큰 제공자
+ * JWT 토큰의 생성, 검증, 파싱을 담당
+ */
+@Slf4j
+@Component
+public class JwtTokenProvider {
+
+    private final SecretKey secretKey;
+    private final long tokenValidityInMilliseconds;
+
+    public JwtTokenProvider(@Value("${jwt.secret}") String secret,
+                           @Value("${jwt.access-token-validity:3600}") long tokenValidityInSeconds) {
+        this.secretKey = Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8));
+        this.tokenValidityInMilliseconds = tokenValidityInSeconds * 1000;
+    }
+
+    /**
+     * HTTP 요청에서 JWT 토큰 추출
+     */
+    public String resolveToken(HttpServletRequest request) {
+        String bearerToken = request.getHeader("Authorization");
+        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith("Bearer ")) {
+            return bearerToken.substring(7);
+        }
+        return null;
+    }
+
+    /**
+     * JWT 토큰 유효성 검증
+     */
+    public boolean validateToken(String token) {
+        try {
+            Jwts.parser()
+                .setSigningKey(secretKey)
+                .build()
+                .parseClaimsJws(token);
+            return true;
+        } catch (SecurityException | MalformedJwtException e) {
+            log.debug("Invalid JWT signature: {}", e.getMessage());
+        } catch (ExpiredJwtException e) {
+            log.debug("Expired JWT token: {}", e.getMessage());
+        } catch (UnsupportedJwtException e) {
+            log.debug("Unsupported JWT token: {}", e.getMessage());
+        } catch (IllegalArgumentException e) {
+            log.debug("JWT token compact of handler are invalid: {}", e.getMessage());
+        }
+        return false;
+    }
+
+    /**
+     * JWT 토큰에서 사용자 ID 추출
+     */
+    public String getUserId(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+
+        return claims.getSubject();
+    }
+
+    /**
+     * JWT 토큰에서 사용자명 추출
+     */
+    public String getUsername(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+
+        return claims.get("username", String.class);
+    }
+
+    /**
+     * JWT 토큰에서 권한 정보 추출
+     */
+    public String getAuthority(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+
+        return claims.get("authority", String.class);
+    }
+
+    /**
+     * 토큰 만료 시간 확인
+     */
+    public boolean isTokenExpired(String token) {
+        try {
+            Claims claims = Jwts.parser()
+                .setSigningKey(secretKey)
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+
+            return claims.getExpiration().before(new Date());
+        } catch (Exception e) {
+            return true;
+        }
+    }
+
+    /**
+     * 토큰에서 만료 시간 추출
+     */
+    public Date getExpirationDate(String token) {
+        Claims claims = Jwts.parser()
+            .setSigningKey(secretKey)
+            .build()
+            .parseClaimsJws(token)
+            .getBody();
+
+        return claims.getExpiration();
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/config/jwt/UserPrincipal.java b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/UserPrincipal.java
new file mode 100644
index 0000000..edd722e
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/config/jwt/UserPrincipal.java
@@ -0,0 +1,51 @@
+package com.unicorn.hgzero.user.config.jwt;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * 인증된 사용자 정보
+ * JWT 토큰에서 추출된 사용자 정보를 담는 Principal 객체
+ */
+@Getter
+@Builder
+@RequiredArgsConstructor
+public class UserPrincipal {
+
+    /**
+     * 사용자 고유 ID
+     */
+    private final String userId;
+
+    /**
+     * 사용자명
+     */
+    private final String username;
+
+    /**
+     * 사용자 권한
+     */
+    private final String authority;
+
+    /**
+     * 사용자 ID 반환 (별칭)
+     */
+    public String getName() {
+        return userId;
+    }
+
+    /**
+     * 관리자 권한 여부 확인
+     */
+    public boolean isAdmin() {
+        return "ADMIN".equals(authority);
+    }
+
+    /**
+     * 일반 사용자 권한 여부 확인
+     */
+    public boolean isUser() {
+        return "USER".equals(authority) || authority == null;
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/controller/UserController.java b/user/src/main/java/com/unicorn/hgzero/user/controller/UserController.java
new file mode 100644
index 0000000..cf8176e
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/controller/UserController.java
@@ -0,0 +1,127 @@
+package com.unicorn.hgzero.user.controller;
+
+import com.unicorn.hgzero.common.dto.ApiResponse;
+import com.unicorn.hgzero.user.config.jwt.UserPrincipal;
+import com.unicorn.hgzero.user.dto.*;
+import com.unicorn.hgzero.user.service.UserService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * 사용자 인증 Controller
+ * 로그인, 토큰 갱신, 로그아웃, 토큰 검증 API 제공
+ */
+@Slf4j
+@RestController
+@RequestMapping("/api/v1/auth")
+@RequiredArgsConstructor
+@Tag(name = "User Authentication", description = "사용자 인증 API")
+public class UserController {
+
+    private final UserService userService;
+
+    /**
+     * 사용자 로그인
+     * LDAP 인증 수행 후 JWT 토큰 발급
+     *
+     * @param request 로그인 요청 정보 (userId, password)
+     * @return 로그인 응답 (Access Token, Refresh Token, 사용자 정보)
+     */
+    @PostMapping("/login")
+    @Operation(
+            summary = "사용자 로그인",
+            description = "LDAP 인증 수행 후 JWT Access Token과 Refresh Token을 발급합니다."
+    )
+    public ResponseEntity<ApiResponse<LoginResponse>> login(
+            @Valid @RequestBody LoginRequest request) {
+
+        log.info("로그인 요청: userId={}", request.getUserId());
+
+        LoginResponse response = userService.login(request);
+
+        return ResponseEntity.ok(ApiResponse.success("로그인 성공", response));
+    }
+
+    /**
+     * Access Token 갱신
+     * Refresh Token을 사용하여 새로운 Access Token 발급
+     *
+     * @param request Refresh Token 요청 정보
+     * @return 새로운 Access Token
+     */
+    @PostMapping("/refresh")
+    @Operation(
+            summary = "Access Token 갱신",
+            description = "Refresh Token을 사용하여 새로운 Access Token을 발급합니다."
+    )
+    public ResponseEntity<ApiResponse<RefreshTokenResponse>> refresh(
+            @Valid @RequestBody RefreshTokenRequest request) {
+
+        log.info("토큰 갱신 요청");
+
+        RefreshTokenResponse response = userService.refresh(request);
+
+        return ResponseEntity.ok(ApiResponse.success("토큰 갱신 성공", response));
+    }
+
+    /**
+     * 로그아웃
+     * Refresh Token 삭제
+     *
+     * @param request 로그아웃 요청 정보 (선택적 Refresh Token)
+     * @param userPrincipal 인증된 사용자 정보
+     * @return 로그아웃 성공 메시지
+     */
+    @PostMapping("/logout")
+    @Operation(
+            summary = "로그아웃",
+            description = "Refresh Token을 삭제하고 로그아웃합니다."
+    )
+    public ResponseEntity<ApiResponse<Void>> logout(
+            @RequestBody(required = false) LogoutRequest request,
+            @AuthenticationPrincipal UserPrincipal userPrincipal) {
+
+        log.info("로그아웃 요청: userId={}", userPrincipal.getUserId());
+
+        userService.logout(request, userPrincipal.getUserId());
+
+        return ResponseEntity.ok(ApiResponse.success("로그아웃 성공", null));
+    }
+
+    /**
+     * Access Token 검증
+     * 토큰 유효성 검증 및 사용자 정보 반환
+     *
+     * @param authorization Authorization 헤더 (Bearer {token})
+     * @return 토큰 검증 결과 및 사용자 정보
+     */
+    @GetMapping("/validate")
+    @Operation(
+            summary = "Access Token 검증",
+            description = "Access Token의 유효성을 검증하고 사용자 정보를 반환합니다."
+    )
+    public ResponseEntity<ApiResponse<TokenValidateResponse>> validate(
+            @Parameter(description = "Bearer {token}", required = true)
+            @RequestHeader("Authorization") String authorization) {
+
+        log.info("토큰 검증 요청");
+
+        // Bearer 제거
+        String token = authorization.replace("Bearer ", "");
+
+        TokenValidateResponse response = userService.validateToken(token);
+
+        if (response.getValid()) {
+            return ResponseEntity.ok(ApiResponse.success("토큰 검증 성공", response));
+        } else {
+            return ResponseEntity.ok(ApiResponse.success("토큰 검증 실패", response));
+        }
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/domain/User.java b/user/src/main/java/com/unicorn/hgzero/user/domain/User.java
new file mode 100644
index 0000000..a87b949
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/domain/User.java
@@ -0,0 +1,104 @@
+package com.unicorn.hgzero.user.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+/**
+ * 사용자 도메인 모델
+ * 사용자 인증 및 계정 정보를 표현
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class User {
+
+    /**
+     * 사용자 ID
+     */
+    private String userId;
+
+    /**
+     * 사용자 이름
+     */
+    private String username;
+
+    /**
+     * 이메일
+     */
+    private String email;
+
+    /**
+     * 권한 (USER, ADMIN)
+     */
+    private String authority;
+
+    /**
+     * 계정 잠금 여부
+     */
+    private Boolean locked;
+
+    /**
+     * 로그인 실패 횟수
+     */
+    private Integer failedLoginAttempts;
+
+    /**
+     * 마지막 로그인 일시
+     */
+    private LocalDateTime lastLoginAt;
+
+    /**
+     * 계정 잠금 일시
+     */
+    private LocalDateTime lockedAt;
+
+    /**
+     * 계정 잠금 해제
+     */
+    public void unlock() {
+        this.locked = false;
+        this.failedLoginAttempts = 0;
+        this.lockedAt = null;
+    }
+
+    /**
+     * 로그인 실패 기록
+     * 5회 실패 시 계정 잠금
+     */
+    public void recordLoginFailure() {
+        this.failedLoginAttempts++;
+        if (this.failedLoginAttempts >= 5) {
+            this.locked = true;
+            this.lockedAt = LocalDateTime.now();
+        }
+    }
+
+    /**
+     * 로그인 성공 기록
+     */
+    public void recordLoginSuccess() {
+        this.failedLoginAttempts = 0;
+        this.lastLoginAt = LocalDateTime.now();
+    }
+
+    /**
+     * 계정 잠금 여부 확인
+     * 30분 경과 시 자동 해제
+     */
+    public boolean isLocked() {
+        if (this.locked && this.lockedAt != null) {
+            // 30분 경과 시 자동 해제
+            if (LocalDateTime.now().isAfter(this.lockedAt.plusMinutes(30))) {
+                this.unlock();
+                return false;
+            }
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/LoginRequest.java b/user/src/main/java/com/unicorn/hgzero/user/dto/LoginRequest.java
new file mode 100644
index 0000000..73c6a57
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/LoginRequest.java
@@ -0,0 +1,29 @@
+package com.unicorn.hgzero.user.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 로그인 요청 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class LoginRequest {
+
+    /**
+     * 사용자 ID
+     */
+    @NotBlank(message = "사용자 ID는 필수입니다.")
+    private String userId;
+
+    /**
+     * 비밀번호
+     */
+    @NotBlank(message = "비밀번호는 필수입니다.")
+    private String password;
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/LoginResponse.java b/user/src/main/java/com/unicorn/hgzero/user/dto/LoginResponse.java
new file mode 100644
index 0000000..8bc9e16
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/LoginResponse.java
@@ -0,0 +1,76 @@
+package com.unicorn.hgzero.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 로그인 응답 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class LoginResponse {
+
+    /**
+     * Access Token
+     */
+    private String accessToken;
+
+    /**
+     * Refresh Token
+     */
+    private String refreshToken;
+
+    /**
+     * 토큰 타입 (Bearer)
+     */
+    @Builder.Default
+    private String tokenType = "Bearer";
+
+    /**
+     * Access Token 유효 기간 (초)
+     */
+    private Long accessTokenValidity;
+
+    /**
+     * Refresh Token 유효 기간 (초)
+     */
+    private Long refreshTokenValidity;
+
+    /**
+     * 사용자 정보
+     */
+    private UserInfo user;
+
+    /**
+     * 사용자 정보 내부 클래스
+     */
+    @Getter
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class UserInfo {
+        /**
+         * 사용자 ID
+         */
+        private String userId;
+
+        /**
+         * 사용자 이름
+         */
+        private String username;
+
+        /**
+         * 이메일
+         */
+        private String email;
+
+        /**
+         * 권한
+         */
+        private String authority;
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/LogoutRequest.java b/user/src/main/java/com/unicorn/hgzero/user/dto/LogoutRequest.java
new file mode 100644
index 0000000..9d8aebd
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/LogoutRequest.java
@@ -0,0 +1,22 @@
+package com.unicorn.hgzero.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 로그아웃 요청 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class LogoutRequest {
+
+    /**
+     * Refresh Token (선택사항)
+     * 제공되면 해당 Refresh Token을 명시적으로 삭제
+     */
+    private String refreshToken;
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenRequest.java b/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenRequest.java
new file mode 100644
index 0000000..603590f
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenRequest.java
@@ -0,0 +1,23 @@
+package com.unicorn.hgzero.user.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * Refresh Token 요청 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class RefreshTokenRequest {
+
+    /**
+     * Refresh Token
+     */
+    @NotBlank(message = "Refresh Token은 필수입니다.")
+    private String refreshToken;
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenResponse.java b/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenResponse.java
new file mode 100644
index 0000000..72d92ba
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/RefreshTokenResponse.java
@@ -0,0 +1,32 @@
+package com.unicorn.hgzero.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * Refresh Token 응답 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class RefreshTokenResponse {
+
+    /**
+     * 새로 발급된 Access Token
+     */
+    private String accessToken;
+
+    /**
+     * 토큰 타입 (Bearer)
+     */
+    @Builder.Default
+    private String tokenType = "Bearer";
+
+    /**
+     * Access Token 유효 기간 (초)
+     */
+    private Long accessTokenValidity;
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/dto/TokenValidateResponse.java b/user/src/main/java/com/unicorn/hgzero/user/dto/TokenValidateResponse.java
new file mode 100644
index 0000000..5e9a0b9
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/dto/TokenValidateResponse.java
@@ -0,0 +1,51 @@
+package com.unicorn.hgzero.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * 토큰 검증 응답 DTO
+ */
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class TokenValidateResponse {
+
+    /**
+     * 토큰 유효 여부
+     */
+    private Boolean valid;
+
+    /**
+     * 사용자 ID
+     */
+    private String userId;
+
+    /**
+     * 사용자 이름
+     */
+    private String username;
+
+    /**
+     * 이메일
+     */
+    private String email;
+
+    /**
+     * 권한
+     */
+    private String authority;
+
+    /**
+     * 토큰 만료 여부
+     */
+    private Boolean expired;
+
+    /**
+     * 에러 메시지 (유효하지 않은 경우)
+     */
+    private String errorMessage;
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/repository/entity/UserEntity.java b/user/src/main/java/com/unicorn/hgzero/user/repository/entity/UserEntity.java
new file mode 100644
index 0000000..19aa794
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/repository/entity/UserEntity.java
@@ -0,0 +1,141 @@
+package com.unicorn.hgzero.user.repository.entity;
+
+import com.unicorn.hgzero.common.entity.BaseTimeEntity;
+import com.unicorn.hgzero.user.domain.User;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+/**
+ * 사용자 Entity
+ * 사용자 인증 정보를 데이터베이스에 저장
+ */
+@Entity
+@Table(name = "users")
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class UserEntity extends BaseTimeEntity {
+
+    /**
+     * 사용자 ID (Primary Key)
+     */
+    @Id
+    @Column(name = "user_id", length = 50)
+    private String userId;
+
+    /**
+     * 사용자 이름
+     */
+    @Column(name = "username", length = 100, nullable = false)
+    private String username;
+
+    /**
+     * 이메일
+     */
+    @Column(name = "email", length = 100, nullable = false)
+    private String email;
+
+    /**
+     * 권한 (USER, ADMIN)
+     */
+    @Column(name = "authority", length = 20, nullable = false)
+    @Builder.Default
+    private String authority = "USER";
+
+    /**
+     * 계정 잠금 여부
+     */
+    @Column(name = "locked", nullable = false)
+    @Builder.Default
+    private Boolean locked = false;
+
+    /**
+     * 로그인 실패 횟수
+     */
+    @Column(name = "failed_login_attempts", nullable = false)
+    @Builder.Default
+    private Integer failedLoginAttempts = 0;
+
+    /**
+     * 마지막 로그인 일시
+     */
+    @Column(name = "last_login_at")
+    private LocalDateTime lastLoginAt;
+
+    /**
+     * 계정 잠금 일시
+     */
+    @Column(name = "locked_at")
+    private LocalDateTime lockedAt;
+
+    /**
+     * Entity를 Domain으로 변환
+     *
+     * @return User 도메인 객체
+     */
+    public User toDomain() {
+        return User.builder()
+                .userId(this.userId)
+                .username(this.username)
+                .email(this.email)
+                .authority(this.authority)
+                .locked(this.locked)
+                .failedLoginAttempts(this.failedLoginAttempts)
+                .lastLoginAt(this.lastLoginAt)
+                .lockedAt(this.lockedAt)
+                .build();
+    }
+
+    /**
+     * Domain을 Entity로 변환
+     *
+     * @param user User 도메인 객체
+     * @return UserEntity
+     */
+    public static UserEntity fromDomain(User user) {
+        return UserEntity.builder()
+                .userId(user.getUserId())
+                .username(user.getUsername())
+                .email(user.getEmail())
+                .authority(user.getAuthority())
+                .locked(user.getLocked())
+                .failedLoginAttempts(user.getFailedLoginAttempts())
+                .lastLoginAt(user.getLastLoginAt())
+                .lockedAt(user.getLockedAt())
+                .build();
+    }
+
+    /**
+     * 계정 잠금 해제
+     */
+    public void unlock() {
+        this.locked = false;
+        this.failedLoginAttempts = 0;
+        this.lockedAt = null;
+    }
+
+    /**
+     * 로그인 실패 기록
+     */
+    public void recordLoginFailure() {
+        this.failedLoginAttempts++;
+        if (this.failedLoginAttempts >= 5) {
+            this.locked = true;
+            this.lockedAt = LocalDateTime.now();
+        }
+    }
+
+    /**
+     * 로그인 성공 기록
+     */
+    public void recordLoginSuccess() {
+        this.failedLoginAttempts = 0;
+        this.lastLoginAt = LocalDateTime.now();
+    }
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/repository/jpa/UserRepository.java b/user/src/main/java/com/unicorn/hgzero/user/repository/jpa/UserRepository.java
new file mode 100644
index 0000000..1bd9f74
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/repository/jpa/UserRepository.java
@@ -0,0 +1,31 @@
+package com.unicorn.hgzero.user.repository.jpa;
+
+import com.unicorn.hgzero.user.repository.entity.UserEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+/**
+ * 사용자 Repository
+ * 사용자 데이터 접근을 위한 JPA Repository
+ */
+@Repository
+public interface UserRepository extends JpaRepository<UserEntity, String> {
+
+    /**
+     * 이메일로 사용자 조회
+     *
+     * @param email 이메일
+     * @return Optional<UserEntity>
+     */
+    Optional<UserEntity> findByEmail(String email);
+
+    /**
+     * 사용자명으로 사용자 조회
+     *
+     * @param username 사용자명
+     * @return Optional<UserEntity>
+     */
+    Optional<UserEntity> findByUsername(String username);
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/service/UserService.java b/user/src/main/java/com/unicorn/hgzero/user/service/UserService.java
new file mode 100644
index 0000000..dc6c569
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/service/UserService.java
@@ -0,0 +1,45 @@
+package com.unicorn.hgzero.user.service;
+
+import com.unicorn.hgzero.user.dto.*;
+
+/**
+ * 사용자 인증 서비스 인터페이스
+ */
+public interface UserService {
+
+    /**
+     * 사용자 로그인
+     * LDAP 인증 수행 후 JWT 토큰 발급
+     *
+     * @param request 로그인 요청 정보
+     * @return 로그인 응답 (Access Token, Refresh Token)
+     */
+    LoginResponse login(LoginRequest request);
+
+    /**
+     * Access Token 갱신
+     * Refresh Token을 사용하여 새로운 Access Token 발급
+     *
+     * @param request Refresh Token 요청 정보
+     * @return 새로운 Access Token
+     */
+    RefreshTokenResponse refresh(RefreshTokenRequest request);
+
+    /**
+     * 로그아웃
+     * Refresh Token 삭제
+     *
+     * @param request 로그아웃 요청 정보
+     * @param userId 사용자 ID
+     */
+    void logout(LogoutRequest request, String userId);
+
+    /**
+     * Access Token 검증
+     * 토큰 유효성 검증 및 사용자 정보 반환
+     *
+     * @param token Access Token
+     * @return 토큰 검증 결과
+     */
+    TokenValidateResponse validateToken(String token);
+}
diff --git a/user/src/main/java/com/unicorn/hgzero/user/service/UserServiceImpl.java b/user/src/main/java/com/unicorn/hgzero/user/service/UserServiceImpl.java
new file mode 100644
index 0000000..6c6e487
--- /dev/null
+++ b/user/src/main/java/com/unicorn/hgzero/user/service/UserServiceImpl.java
@@ -0,0 +1,321 @@
+package com.unicorn.hgzero.user.service;
+
+import com.unicorn.hgzero.common.exception.BusinessException;
+import com.unicorn.hgzero.common.exception.ErrorCode;
+import com.unicorn.hgzero.user.config.jwt.JwtTokenProvider;
+import com.unicorn.hgzero.user.domain.User;
+import com.unicorn.hgzero.user.dto.*;
+import com.unicorn.hgzero.user.repository.entity.UserEntity;
+import com.unicorn.hgzero.user.repository.jpa.UserRepository;
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.ldap.core.LdapTemplate;
+import org.springframework.ldap.filter.EqualsFilter;
+import org.springframework.ldap.filter.Filter;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.crypto.SecretKey;
+import javax.naming.directory.DirContext;
+import java.nio.charset.StandardCharsets;
+import java.time.LocalDateTime;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+import io.jsonwebtoken.security.Keys;
+
+/**
+ * 사용자 인증 서비스 구현체
+ * LDAP 인증, JWT 토큰 발급, Refresh Token 관리 기능 제공
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class UserServiceImpl implements UserService {
+
+    private final LdapTemplate ldapTemplate;
+    private final UserRepository userRepository;
+    private final JwtTokenProvider jwtTokenProvider;
+    private final RedisTemplate<String, String> redisTemplate;
+
+    @Value("${jwt.secret}")
+    private String jwtSecret;
+
+    @Value("${jwt.access-token-validity:3600}")
+    private Long accessTokenValidity;
+
+    @Value("${jwt.refresh-token-validity:604800}")
+    private Long refreshTokenValidity;
+
+    @Value("${spring.ldap.user-dn-pattern:uid={0},ou=people}")
+    private String userDnPattern;
+
+    /**
+     * 사용자 로그인
+     * LDAP 인증 수행 후 JWT 토큰 발급
+     */
+    @Override
+    @Transactional
+    public LoginResponse login(LoginRequest request) {
+        log.info("로그인 시도: userId={}", request.getUserId());
+
+        // 사용자 조회 또는 생성
+        UserEntity userEntity = userRepository.findById(request.getUserId())
+                .orElse(null);
+
+        // 계정 잠금 확인
+        if (userEntity != null && userEntity.getLocked()) {
+            // 30분 경과 시 자동 해제
+            if (userEntity.getLockedAt() != null &&
+                LocalDateTime.now().isAfter(userEntity.getLockedAt().plusMinutes(30))) {
+                userEntity.unlock();
+                userRepository.save(userEntity);
+            } else {
+                log.warn("계정 잠금: userId={}", request.getUserId());
+                throw new BusinessException(ErrorCode.ACCOUNT_LOCKED);
+            }
+        }
+
+        // LDAP 인증
+        try {
+            authenticateWithLdap(request.getUserId(), request.getPassword());
+            log.info("LDAP 인증 성공: userId={}", request.getUserId());
+        } catch (Exception e) {
+            log.error("LDAP 인증 실패: userId={}, error={}", request.getUserId(), e.getMessage());
+
+            // 로그인 실패 기록
+            if (userEntity != null) {
+                userEntity.recordLoginFailure();
+                userRepository.save(userEntity);
+            }
+
+            throw new BusinessException(ErrorCode.AUTHENTICATION_FAILED, "인증에 실패했습니다.");
+        }
+
+        // 사용자 정보 조회 또는 생성
+        if (userEntity == null) {
+            // LDAP에서 추가 정보 조회 (실제 환경에서는 LDAP에서 이메일 등을 가져와야 함)
+            userEntity = UserEntity.builder()
+                    .userId(request.getUserId())
+                    .username(request.getUserId()) // LDAP에서 가져온 실제 이름 사용
+                    .email(request.getUserId() + "@example.com") // LDAP에서 가져온 실제 이메일 사용
+                    .authority("USER")
+                    .locked(false)
+                    .failedLoginAttempts(0)
+                    .build();
+        }
+
+        // 로그인 성공 기록
+        userEntity.recordLoginSuccess();
+        userEntity = userRepository.save(userEntity);
+
+        User user = userEntity.toDomain();
+
+        // JWT 토큰 생성
+        String accessToken = generateAccessToken(user);
+        String refreshToken = generateRefreshToken(user);
+
+        // Refresh Token을 Redis에 저장
+        saveRefreshToken(user.getUserId(), refreshToken);
+
+        log.info("로그인 성공: userId={}", request.getUserId());
+
+        return LoginResponse.builder()
+                .accessToken(accessToken)
+                .refreshToken(refreshToken)
+                .tokenType("Bearer")
+                .accessTokenValidity(accessTokenValidity)
+                .refreshTokenValidity(refreshTokenValidity)
+                .user(LoginResponse.UserInfo.builder()
+                        .userId(user.getUserId())
+                        .username(user.getUsername())
+                        .email(user.getEmail())
+                        .authority(user.getAuthority())
+                        .build())
+                .build();
+    }
+
+    /**
+     * Access Token 갱신
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public RefreshTokenResponse refresh(RefreshTokenRequest request) {
+        log.info("토큰 갱신 시도");
+
+        // Refresh Token 검증
+        if (!jwtTokenProvider.validateToken(request.getRefreshToken())) {
+            log.warn("유효하지 않은 Refresh Token");
+            throw new BusinessException(ErrorCode.INVALID_REFRESH_TOKEN);
+        }
+
+        // Refresh Token에서 사용자 ID 추출
+        String userId = jwtTokenProvider.getUserId(request.getRefreshToken());
+
+        // Redis에서 저장된 Refresh Token 조회
+        String savedRefreshToken = getRefreshToken(userId);
+        if (savedRefreshToken == null || !savedRefreshToken.equals(request.getRefreshToken())) {
+            log.warn("Refresh Token이 일치하지 않음: userId={}", userId);
+            throw new BusinessException(ErrorCode.INVALID_REFRESH_TOKEN);
+        }
+
+        // 사용자 조회
+        UserEntity userEntity = userRepository.findById(userId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.ENTITY_NOT_FOUND, "사용자를 찾을 수 없습니다."));
+
+        User user = userEntity.toDomain();
+
+        // 새로운 Access Token 생성
+        String newAccessToken = generateAccessToken(user);
+
+        log.info("토큰 갱신 성공: userId={}", userId);
+
+        return RefreshTokenResponse.builder()
+                .accessToken(newAccessToken)
+                .tokenType("Bearer")
+                .accessTokenValidity(accessTokenValidity)
+                .build();
+    }
+
+    /**
+     * 로그아웃
+     */
+    @Override
+    @Transactional
+    public void logout(LogoutRequest request, String userId) {
+        log.info("로그아웃: userId={}", userId);
+
+        // Redis에서 Refresh Token 삭제
+        deleteRefreshToken(userId);
+
+        log.info("로그아웃 완료: userId={}", userId);
+    }
+
+    /**
+     * Access Token 검증
+     */
+    @Override
+    @Transactional(readOnly = true)
+    public TokenValidateResponse validateToken(String token) {
+        log.debug("토큰 검증 시작");
+
+        try {
+            // 토큰 유효성 검증
+            if (!jwtTokenProvider.validateToken(token)) {
+                return TokenValidateResponse.builder()
+                        .valid(false)
+                        .expired(jwtTokenProvider.isTokenExpired(token))
+                        .errorMessage("유효하지 않은 토큰입니다.")
+                        .build();
+            }
+
+            // 토큰에서 사용자 정보 추출
+            String userId = jwtTokenProvider.getUserId(token);
+            String username = jwtTokenProvider.getUsername(token);
+            String authority = jwtTokenProvider.getAuthority(token);
+
+            // 사용자 조회
+            UserEntity userEntity = userRepository.findById(userId)
+                    .orElse(null);
+
+            return TokenValidateResponse.builder()
+                    .valid(true)
+                    .userId(userId)
+                    .username(username)
+                    .email(userEntity != null ? userEntity.getEmail() : null)
+                    .authority(authority)
+                    .expired(false)
+                    .build();
+
+        } catch (Exception e) {
+            log.error("토큰 검증 실패: error={}", e.getMessage());
+            return TokenValidateResponse.builder()
+                    .valid(false)
+                    .expired(false)
+                    .errorMessage("토큰 검증 중 오류가 발생했습니다.")
+                    .build();
+        }
+    }
+
+    /**
+     * LDAP 인증 수행
+     */
+    private void authenticateWithLdap(String userId, String password) {
+        // LDAP DN 생성
+        String userDn = userDnPattern.replace("{0}", userId);
+
+        // LDAP 인증
+        Filter filter = new EqualsFilter("uid", userId);
+        boolean authenticated = ldapTemplate.authenticate("", filter.encode(), password);
+
+        if (!authenticated) {
+            throw new BusinessException(ErrorCode.AUTHENTICATION_FAILED);
+        }
+    }
+
+    /**
+     * Access Token 생성
+     */
+    private String generateAccessToken(User user) {
+        Date now = new Date();
+        Date expiryDate = new Date(now.getTime() + accessTokenValidity * 1000);
+
+        SecretKey key = Keys.hmacShaKeyFor(jwtSecret.getBytes(StandardCharsets.UTF_8));
+
+        return Jwts.builder()
+                .setSubject(user.getUserId())
+                .claim("username", user.getUsername())
+                .claim("authority", user.getAuthority())
+                .setIssuedAt(now)
+                .setExpiration(expiryDate)
+                .signWith(key)
+                .compact();
+    }
+
+    /**
+     * Refresh Token 생성
+     */
+    private String generateRefreshToken(User user) {
+        Date now = new Date();
+        Date expiryDate = new Date(now.getTime() + refreshTokenValidity * 1000);
+
+        SecretKey key = Keys.hmacShaKeyFor(jwtSecret.getBytes(StandardCharsets.UTF_8));
+
+        return Jwts.builder()
+                .setSubject(user.getUserId())
+                .setIssuedAt(now)
+                .setExpiration(expiryDate)
+                .signWith(key)
+                .compact();
+    }
+
+    /**
+     * Refresh Token을 Redis에 저장
+     */
+    private void saveRefreshToken(String userId, String refreshToken) {
+        String key = "refresh_token:" + userId;
+        redisTemplate.opsForValue().set(key, refreshToken, refreshTokenValidity, TimeUnit.SECONDS);
+        log.debug("Refresh Token 저장: userId={}", userId);
+    }
+
+    /**
+     * Redis에서 Refresh Token 조회
+     */
+    private String getRefreshToken(String userId) {
+        String key = "refresh_token:" + userId;
+        return redisTemplate.opsForValue().get(key);
+    }
+
+    /**
+     * Redis에서 Refresh Token 삭제
+     */
+    private void deleteRefreshToken(String userId) {
+        String key = "refresh_token:" + userId;
+        redisTemplate.delete(key);
+        log.debug("Refresh Token 삭제: userId={}", userId);
+    }
+}
diff --git a/user/src/main/resources/application.yml b/user/src/main/resources/application.yml
new file mode 100644
index 0000000..111d42d
--- /dev/null
+++ b/user/src/main/resources/application.yml
@@ -0,0 +1,105 @@
+spring:
+  application:
+    name: user
+
+  # Database Configuration
+  datasource:
+    url: jdbc:${DB_KIND:postgresql}://${DB_HOST:20.214.121.121}:${DB_PORT:5432}/${DB_NAME:userdb}
+    username: ${DB_USERNAME:hgzerouser}
+    password: ${DB_PASSWORD:}
+    driver-class-name: org.postgresql.Driver
+    hikari:
+      maximum-pool-size: 20
+      minimum-idle: 5
+      connection-timeout: 30000
+      idle-timeout: 600000
+      max-lifetime: 1800000
+      leak-detection-threshold: 60000
+
+  # JPA Configuration
+  jpa:
+    show-sql: ${SHOW_SQL:true}
+    properties:
+      hibernate:
+        format_sql: true
+        use_sql_comments: true
+    hibernate:
+      ddl-auto: ${DDL_AUTO:update}
+
+  # Redis Configuration
+  data:
+    redis:
+      host: ${REDIS_HOST:20.249.177.114}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      timeout: 2000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+          max-wait: -1ms
+      database: ${REDIS_DATABASE:0}
+
+  # LDAP Configuration
+  ldap:
+    urls: ${LDAP_URLS:ldaps://ldap.example.com:636}
+    base: ${LDAP_BASE:dc=example,dc=com}
+    username: ${LDAP_USERNAME:}
+    password: ${LDAP_PASSWORD:}
+    user-dn-pattern: ${LDAP_USER_DN_PATTERN:uid={0},ou=people}
+
+# Server Configuration
+server:
+  port: ${SERVER_PORT:8080}
+
+# JWT Configuration
+jwt:
+  secret: ${JWT_SECRET:}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+
+# CORS Configuration
+cors:
+  allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
+
+# Actuator Configuration
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus
+      base-path: /actuator
+  endpoint:
+    health:
+      show-details: always
+      show-components: always
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+
+# OpenAPI Documentation
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
+    tags-sorter: alpha
+    operations-sorter: alpha
+  show-actuator: false
+
+# Logging Configuration
+logging:
+  level:
+    com.unicorn.hgzero.user: ${LOG_LEVEL_APP:DEBUG}
+    org.springframework.web: ${LOG_LEVEL_WEB:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:DEBUG}
+    org.hibernate.SQL: ${LOG_LEVEL_SQL:DEBUG}
+    org.hibernate.type: ${LOG_LEVEL_SQL_TYPE:TRACE}
+  pattern:
+    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
+  file:
+    name: ${LOG_FILE_PATH:logs/user.log}