diff --git a/cakey-api/src/main/java/com/cakey/common/response/ApiResponseUtil.java b/cakey-api/src/main/java/com/cakey/common/response/ApiResponseUtil.java
new file mode 100644
index 0000000..d1fb016
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/common/response/ApiResponseUtil.java
@@ -0,0 +1,29 @@
+package com.cakey.common.response;
+
+import com.cakey.ApiCode;
+import com.cakey.exception.ErrorCode;
+import org.springframework.http.ResponseEntity;
+
+public class ApiResponseUtil {
+    public static ResponseEntity<BaseResponse<?>> success(final SuccessCode successCode) {
+        return org.springframework.http.ResponseEntity.status(successCode.getHttpStatus())
+                .body(BaseResponse.of(successCode));
+    }
+
+    public static <T> ResponseEntity<BaseResponse<?>> success(final SuccessCode successCode, final T data) {
+        return ResponseEntity.status(successCode.getHttpStatus())
+                .body(BaseResponse.of(successCode, data));
+    }
+
+    public static ResponseEntity<BaseResponse<?>> failure(final ErrorCode errorCode) {
+        return ResponseEntity.status(errorCode.getHttpStatus())
+                .body(BaseResponse.of(errorCode));
+    }
+
+    //따로 error message 넣어줄 때, 사용
+    public static ResponseEntity<BaseResponse<?>> failure(final ErrorCode errorCode, final String message) {
+        return ResponseEntity
+                .status(errorCode.getHttpStatus())
+                .body(BaseResponse.of(errorCode.getCode(), message));
+    }
+}
diff --git a/cakey-api/src/main/java/com/cakey/common/response/BaseResponse.java b/cakey-api/src/main/java/com/cakey/common/response/BaseResponse.java
new file mode 100644
index 0000000..4b50558
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/common/response/BaseResponse.java
@@ -0,0 +1,43 @@
+package com.cakey.common.response;
+
+import com.cakey.ApiCode;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor(access = lombok.AccessLevel.PRIVATE)
+@AllArgsConstructor(access = lombok.AccessLevel.PRIVATE)
+@Builder(access = lombok.AccessLevel.PRIVATE)
+public class BaseResponse<T> {
+    private int code;
+    private String message;
+
+    @JsonInclude(JsonInclude.Include.NON_NULL)
+    private T data;
+
+    public static BaseResponse<?> of(final ApiCode apiMessage) {
+        return BaseResponse.builder()
+                .code(apiMessage.getCode())
+                .message(apiMessage.getMessage())
+                .build();
+    }
+
+    public static <T> BaseResponse<?> of(SuccessCode successCode, T data) {
+        return BaseResponse.builder()
+                .code(successCode.getCode())
+                .message(successCode.getMessage())
+                .data(data)
+                .build();
+    }
+
+    //error 메시지 따로 넣어줄 때, 사용
+    public static BaseResponse<?> of(final int code, final String message) {
+        return BaseResponse.builder()
+                .code(code)
+                .message(message)
+                .build();
+    }
+}
diff --git a/cakey-api/src/main/java/com/cakey/common/response/SuccessCode.java b/cakey-api/src/main/java/com/cakey/common/response/SuccessCode.java
new file mode 100644
index 0000000..3767153
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/common/response/SuccessCode.java
@@ -0,0 +1,40 @@
+package com.cakey.common.response;
+
+import com.cakey.ApiCode;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+
+@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+@Getter
+public enum SuccessCode implements ApiCode {
+    /**
+     * 200 OK
+     */
+    OK(HttpStatus.OK, 20000, "요청이 성공했습니다."),
+
+    /**
+     * 201 Created
+     */
+    CREATED(HttpStatus.CREATED, 200100, "요청이 성공했습니다.");
+
+    private final HttpStatus httpStatus;
+    private final int code;
+    private final String message;
+
+    @Override
+    public HttpStatus getHttpStatus() {
+        return httpStatus;
+    }
+
+    @Override
+    public int getCode() {
+        return code;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+}
\ No newline at end of file
diff --git a/cakey-api/src/main/java/com/cakey/controller/.gitkeep b/cakey-api/src/main/java/com/cakey/controller/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/dto/.gitkeep b/cakey-api/src/main/java/com/cakey/dto/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/exception/handler/GlobalExceptionHandler.java b/cakey-api/src/main/java/com/cakey/exception/handler/GlobalExceptionHandler.java
new file mode 100644
index 0000000..db555bb
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/exception/handler/GlobalExceptionHandler.java
@@ -0,0 +1,7 @@
+package com.cakey.exception.handler;
+
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+}
diff --git a/cakey-api/src/main/java/com/cakey/exception/user/.gitkeep b/cakey-api/src/main/java/com/cakey/exception/user/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/facade/.gitkeep b/cakey-api/src/main/java/com/cakey/facade/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/user/controller/.gitkeep b/cakey-api/src/main/java/com/cakey/user/controller/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/user/dto/.gitkeep b/cakey-api/src/main/java/com/cakey/user/dto/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-api/src/main/java/com/cakey/user/exception/UserApiException.java b/cakey-api/src/main/java/com/cakey/user/exception/UserApiException.java
new file mode 100644
index 0000000..454615a
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/user/exception/UserApiException.java
@@ -0,0 +1,6 @@
+package com.cakey.user.exception;
+
+import com.cakey.exception.UserBaseException;
+
+public class UserApiException extends UserBaseException {
+}
diff --git a/cakey-api/src/main/java/com/cakey/user/exception/UserErrorCode.java b/cakey-api/src/main/java/com/cakey/user/exception/UserErrorCode.java
new file mode 100644
index 0000000..29e2072
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/user/exception/UserErrorCode.java
@@ -0,0 +1,23 @@
+package com.cakey.user.exception;
+
+import com.cakey.ApiCode;
+import org.springframework.http.HttpStatus;
+
+public enum UserErrorCode implements ApiCode {
+    ;
+
+    @Override
+    public HttpStatus getHttpStatus() {
+        return null;
+    }
+
+    @Override
+    public int getCode() {
+        return 0;
+    }
+
+    @Override
+    public String getMessage() {
+        return "";
+    }
+}
diff --git a/cakey-api/src/main/java/com/cakey/user/facade/.gitkeep b/cakey-api/src/main/java/com/cakey/user/facade/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-common/src/main/java/com/cakey/ApiCode.java b/cakey-common/src/main/java/com/cakey/ApiCode.java
new file mode 100644
index 0000000..8dfea99
--- /dev/null
+++ b/cakey-common/src/main/java/com/cakey/ApiCode.java
@@ -0,0 +1,9 @@
+package com.cakey;
+
+import org.springframework.http.HttpStatus;
+
+public interface ApiCode {
+    HttpStatus getHttpStatus();
+    int getCode();
+    String getMessage();
+}
diff --git a/cakey-common/src/main/java/com/cakey/Main.java b/cakey-common/src/main/java/com/cakey/Main.java
deleted file mode 100644
index 4a3a482..0000000
--- a/cakey-common/src/main/java/com/cakey/Main.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.cakey;
-
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
-    }
-}
\ No newline at end of file
diff --git a/cakey-common/src/main/java/com/cakey/exception/CakeyException.java b/cakey-common/src/main/java/com/cakey/exception/CakeyException.java
new file mode 100644
index 0000000..44a4e51
--- /dev/null
+++ b/cakey-common/src/main/java/com/cakey/exception/CakeyException.java
@@ -0,0 +1,5 @@
+package com.cakey.exception;
+
+public class CakeyException extends RuntimeException {
+
+}
diff --git a/cakey-common/src/main/java/com/cakey/exception/ErrorCode.java b/cakey-common/src/main/java/com/cakey/exception/ErrorCode.java
new file mode 100644
index 0000000..a848415
--- /dev/null
+++ b/cakey-common/src/main/java/com/cakey/exception/ErrorCode.java
@@ -0,0 +1,73 @@
+package com.cakey.exception;
+
+import com.cakey.ApiCode;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+public enum ErrorCode implements ApiCode {
+    /**
+     * 400 Bad Request
+     */
+    BAD_REQUEST(HttpStatus.BAD_REQUEST, 40000, "잘못된 요청입니다."),
+    BAD_REQUEST_REQUEST_BODY_VALID(HttpStatus.BAD_REQUEST, 40001, "request body 검증 실패입니다."),
+    BAD_REQUEST_REQUEST_PARAM_MODELATTRI(HttpStatus.BAD_REQUEST, 40002, "request param 혹은 modelattribute 검증 실패입니다."),
+    BAD_REQUEST_MISSING_PARAM(HttpStatus.BAD_REQUEST, 40003, "필수 param이 없습니다."),
+    BAD_REQUEST_METHOD_ARGUMENT_TYPE(HttpStatus.BAD_REQUEST, 40004, "메서드 인자타입이 잘못되었습니다."),
+    BAD_REQUEST_NOT_READABLE(HttpStatus.BAD_REQUEST, 40005, "json 오류 혹은 reqeust body 필드 오류 입니다."),
+
+    /**
+     * 401 Unauthorized
+     */
+    UNAUTHORIZED(HttpStatus.UNAUTHORIZED, 40100, "리소스 접근 인증 권한이 없습니다."),
+
+    /**
+     * 403 Forbidden
+     */
+    FORBIDDEN(HttpStatus.FORBIDDEN, 40300, "리소스 접근 인가 권한이 없습니다."),
+
+    /**
+     * 404 Not Found
+     */
+    NOT_FOUND_ENTITY(HttpStatus.NOT_FOUND, 40400, "대상을 찾을 수 없습니다."),
+    NOT_FOUND_API(HttpStatus.NOT_FOUND, 40401, "잘못된 API입니다."),
+
+    /**
+     * 405 Method Not Allowed
+     */
+    METHOD_NOT_ALLOWED(HttpStatus.METHOD_NOT_ALLOWED, 40500, "잘못된 HTTP method 요청입니다."),
+
+    /**
+     * 409 Conflict
+     */
+    CONFLICT(HttpStatus.CONFLICT, 40900, "이미 존재하는 리소스입니다."),
+    INTEGRITY_CONFLICT(HttpStatus.CONFLICT, 40901, "데이터 무결성 위반입니다."),
+
+    /**
+     * 500 Internal Server Error
+     */
+    INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, 50000, "서버 내부 오류입니다.");
+
+    private final HttpStatus httpStatus;
+    private final int code;
+    private final String message;
+
+    @Override
+    public HttpStatus getHttpStatus() {
+        return httpStatus;
+    }
+
+    @Override
+    public int getCode() {
+        return code;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+}
+
diff --git a/cakey-common/src/main/java/com/cakey/exception/UserBaseException.java b/cakey-common/src/main/java/com/cakey/exception/UserBaseException.java
new file mode 100644
index 0000000..281ec79
--- /dev/null
+++ b/cakey-common/src/main/java/com/cakey/exception/UserBaseException.java
@@ -0,0 +1,5 @@
+package com.cakey.exception;
+
+public class UserBaseException extends CakeyException {
+
+}
diff --git a/cakey-domain/build.gradle b/cakey-domain/build.gradle
index 2da0965..a1367e7 100644
--- a/cakey-domain/build.gradle
+++ b/cakey-domain/build.gradle
@@ -5,4 +5,7 @@ dependencies {
     implementation project(':cakey-common')   // 공통 모듈 의존성
     implementation project(':cakey-auth')     // 인증 모듈 의존성
     implementation project(':cakey-external')     // 외부 모듈 의존성
+
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
 }
diff --git a/cakey-domain/src/main/java/com/cakey/Main.java b/cakey-domain/src/main/java/com/cakey/Main.java
deleted file mode 100644
index 4a3a482..0000000
--- a/cakey-domain/src/main/java/com/cakey/Main.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.cakey;
-
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
-    }
-}
\ No newline at end of file
diff --git a/cakey-domain/src/main/java/com/cakey/common/BaseTimeEntity.java b/cakey-domain/src/main/java/com/cakey/common/BaseTimeEntity.java
new file mode 100644
index 0000000..79adbb5
--- /dev/null
+++ b/cakey-domain/src/main/java/com/cakey/common/BaseTimeEntity.java
@@ -0,0 +1,19 @@
+package com.cakey.common;
+
+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.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+@Getter
+@EntityListeners(AuditingEntityListener.class)
+@MappedSuperclass
+public abstract class BaseTimeEntity {
+    @Column(updatable = false)
+    @CreatedDate
+    private LocalDateTime createdDate;
+}
diff --git a/cakey-domain/src/main/java/com/cakey/common/JpaAuditingConfig.java b/cakey-domain/src/main/java/com/cakey/common/JpaAuditingConfig.java
new file mode 100644
index 0000000..d2efee6
--- /dev/null
+++ b/cakey-domain/src/main/java/com/cakey/common/JpaAuditingConfig.java
@@ -0,0 +1,9 @@
+package com.cakey.common;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+@Configuration
+@EnableJpaAuditing
+public class JpaAuditingConfig {
+}
diff --git a/cakey-domain/src/main/java/com/cakey/user/domain/.gitkeep b/cakey-domain/src/main/java/com/cakey/user/domain/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-domain/src/main/java/com/cakey/user/exception/UserDomainException.java b/cakey-domain/src/main/java/com/cakey/user/exception/UserDomainException.java
new file mode 100644
index 0000000..050c562
--- /dev/null
+++ b/cakey-domain/src/main/java/com/cakey/user/exception/UserDomainException.java
@@ -0,0 +1,6 @@
+package com.cakey.user.exception;
+
+import com.cakey.exception.UserBaseException;
+
+public class UserDomainException extends UserBaseException {
+}
diff --git a/cakey-domain/src/main/java/com/cakey/user/repository/.gitkeep b/cakey-domain/src/main/java/com/cakey/user/repository/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-domain/src/main/java/com/cakey/user/service/.gitkeep b/cakey-domain/src/main/java/com/cakey/user/service/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/cakey-external/src/main/java/com/cakey/Main.java b/cakey-external/src/main/java/com/cakey/Main.java
deleted file mode 100644
index 4a3a482..0000000
--- a/cakey-external/src/main/java/com/cakey/Main.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.cakey;
-
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
-    }
-}
\ No newline at end of file
diff --git a/cakey-external/src/main/java/com/cakey/aws/.gitkeep b/cakey-external/src/main/java/com/cakey/aws/.gitkeep
new file mode 100644
index 0000000..e69de29