diff --git a/devlog_springboot b/devlog_springboot
new file mode 160000
index 0000000..1238b94
--- /dev/null
+++ b/devlog_springboot
@@ -0,0 +1 @@
+Subproject commit 1238b947e2db605ccec4f0abded208c995c72ce5
diff --git a/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java b/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
index 6739bf0..1cd63ab 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
+++ b/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
@@ -6,8 +6,7 @@
 @SpringBootApplication
 public class DevlogSpringbootApplication {
 
-    public static void main(String[] args) {
-        SpringApplication.run(DevlogSpringbootApplication.class, args);
+    public static void main(String[] args) {SpringApplication.run(DevlogSpringbootApplication.class, args);
     }
 
 }
diff --git a/src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java b/src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java
new file mode 100644
index 0000000..21ea0d8
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java
@@ -0,0 +1,54 @@
+package com.com.cnu.devlog_springboot.controller;
+
+import com.com.cnu.devlog_springboot.model.Post;
+import com.com.cnu.devlog_springboot.model.request.PostRequest;
+import com.com.cnu.devlog_springboot.service.PostService;
+import com.com.cnu.devlog_springboot.type.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.lang.Nullable;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/posts")
+@RequiredArgsConstructor
+public class PostController {
+  private final PostService postService;
+
+  // GET /posts?tag=JAVA
+  @GetMapping
+  public ResponseEntity<List<Post>> getPosts(@RequestParam("tag") @Nullable Tag tag) {
+    return ResponseEntity.ok(postService.getPosts(tag));
+  }
+
+  // GET /posts/{postId}
+  @GetMapping("{postId}")
+  public ResponseEntity<Post> getPost(@PathVariable("postId") Integer postId) {
+    return ResponseEntity.ok(postService.getPost(postId));
+  }
+
+  // POST /posts
+  @PostMapping
+  public ResponseEntity<Post> createPost(@RequestBody PostRequest postRequest) {
+    return ResponseEntity.ok(postService.createPost(postRequest));
+  }
+
+  // Put /posts/{postId}
+  // localhost:8080/posts/3
+  @PutMapping("{postId}")
+  public ResponseEntity<Post> updatePost(
+          @PathVariable("postId") Integer postId,
+          @RequestBody PostRequest postRequest
+  ) {
+    return ResponseEntity.ok(postService.updatePost(postId, postRequest));
+  }
+
+  // DELETE //posts/{postId}
+  @DeleteMapping("{postId}")
+  public ResponseEntity<Void> deletePost(@PathVariable("postId") Integer postId) {
+    postService.deletePost(postId);
+    return ResponseEntity.noContent().build();
+  }
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/controller/ProjectController.java b/src/main/java/com/com/cnu/devlog_springboot/controller/ProjectController.java
new file mode 100644
index 0000000..b4a1643
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/controller/ProjectController.java
@@ -0,0 +1,53 @@
+package com.com.cnu.devlog_springboot.controller;
+
+import com.com.cnu.devlog_springboot.model.Project;
+import com.com.cnu.devlog_springboot.model.request.ProjectRequest;
+import com.com.cnu.devlog_springboot.service.ProjectService;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/project")
+@RequiredArgsConstructor
+public class ProjectController {
+
+  private final ProjectService projectService;
+
+  @PostMapping
+  public ResponseEntity<Project> createPost(@RequestBody ProjectRequest projectRequest) {
+    return ResponseEntity.ok(projectService.createProject(projectRequest));
+  }
+
+  @GetMapping
+  public ResponseEntity<List<Project>> getProjects() {
+    return ResponseEntity.ok(projectService.getProjects());
+  }
+
+  @GetMapping("{projectId}")
+  public ResponseEntity<Project> getProject(@PathVariable("projectId") Integer projectId) {
+    return ResponseEntity.ok(projectService.getProject(projectId));
+  }
+
+  @PutMapping("{projectId}")
+  public ResponseEntity<Project> updateProject(
+          @PathVariable("projectId") Integer projectId,
+          @RequestBody ProjectRequest projectRequest
+  ) {
+    return ResponseEntity.ok(projectService.updateProject(projectId, projectRequest));
+  }
+
+  @DeleteMapping("{projectId}")
+  public ResponseEntity<Void> deletePost(@PathVariable("projectId") Integer projectId) {
+    projectService.deletePost(projectId);
+    return ResponseEntity.noContent().build();
+  }
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/exception/DevlogException.java b/src/main/java/com/com/cnu/devlog_springboot/exception/DevlogException.java
new file mode 100644
index 0000000..b86c719
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/exception/DevlogException.java
@@ -0,0 +1,11 @@
+package com.com.cnu.devlog_springboot.exception;
+
+import com.com.cnu.devlog_springboot.type.ErrorCode;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class DevlogException extends RuntimeException {
+  private final ErrorCode errorCode;
+}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java b/src/main/java/com/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java
new file mode 100644
index 0000000..239c600
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java
@@ -0,0 +1,26 @@
+package com.com.cnu.devlog_springboot.exception;
+
+import com.com.cnu.devlog_springboot.model.response.ErrorResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+  @ExceptionHandler(DevlogException.class)
+  public ResponseEntity<ErrorResponse> handlerDevlogException(
+          HttpServletRequest request, DevlogException e
+  ) {
+    return ResponseEntity.status(e.getErrorCode().getHttpStatus())
+            .body(
+                    new ErrorResponse(
+                            e.getErrorCode().getDescription(),
+                            e.getErrorCode().getHttpStatus().value(),
+                            e.getErrorCode().getErrorCode(),
+                            request.getRequestURI()
+                    )
+            );
+  }
+}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/Post.java b/src/main/java/com/com/cnu/devlog_springboot/model/Post.java
new file mode 100644
index 0000000..8c5557f
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/Post.java
@@ -0,0 +1,22 @@
+package com.com.cnu.devlog_springboot.model;
+
+import com.com.cnu.devlog_springboot.type.Tag;
+import jakarta.persistence.*;
+import lombok.*;
+
+@Getter @Setter
+@Entity(name = "posts")
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED, force = true)
+public class Post {
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  Integer id;
+
+  String title;
+
+  String contents;
+
+  @Enumerated(value = EnumType.STRING)
+  Tag tag;
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/Project.java b/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
new file mode 100644
index 0000000..0265737
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
@@ -0,0 +1,25 @@
+package com.com.cnu.devlog_springboot.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.*;
+
+import java.time.LocalDate;
+
+@Getter
+@Setter
+@Entity(name = "projects")
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED, force = true)
+public class Project {
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  Integer id;
+  String title;
+  String summary;
+  String contents;
+  LocalDate startDate;
+  LocalDate endDate;
+}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/request/PostRequest.java b/src/main/java/com/com/cnu/devlog_springboot/model/request/PostRequest.java
new file mode 100644
index 0000000..f98f828
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/request/PostRequest.java
@@ -0,0 +1,10 @@
+package com.com.cnu.devlog_springboot.model.request;
+
+import com.com.cnu.devlog_springboot.type.Tag;
+
+public record PostRequest(
+        String title,
+        String content,
+        Tag tag
+) {
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java b/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
new file mode 100644
index 0000000..8716f42
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
@@ -0,0 +1,12 @@
+package com.com.cnu.devlog_springboot.model.request;
+
+import java.time.LocalDate;
+
+public record ProjectRequest(
+        String title,
+        String summary,
+        String contents,
+        LocalDate startDate,
+        LocalDate endDate
+) {
+}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/response/ErrorResponse.java b/src/main/java/com/com/cnu/devlog_springboot/model/response/ErrorResponse.java
new file mode 100644
index 0000000..19f5c3e
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/response/ErrorResponse.java
@@ -0,0 +1,8 @@
+package com.com.cnu.devlog_springboot.model.response;
+
+public record ErrorResponse(
+        String title,
+        Integer status,
+        Integer code,
+        String instance
+) {}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java b/src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java
new file mode 100644
index 0000000..13264f7
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java
@@ -0,0 +1,13 @@
+package com.com.cnu.devlog_springboot.repository;
+
+import com.com.cnu.devlog_springboot.model.Post;
+import com.com.cnu.devlog_springboot.type.Tag;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface PostRepository extends JpaRepository<Post, Integer> {
+  List<Post> findAllByTag(Tag tag);
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/repository/ProjectRepository.java b/src/main/java/com/com/cnu/devlog_springboot/repository/ProjectRepository.java
new file mode 100644
index 0000000..6dd52f7
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/repository/ProjectRepository.java
@@ -0,0 +1,6 @@
+package com.com.cnu.devlog_springboot.repository;
+
+import com.com.cnu.devlog_springboot.model.Project;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ProjectRepository extends JpaRepository<Project, Integer> {}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/service/PostService.java b/src/main/java/com/com/cnu/devlog_springboot/service/PostService.java
new file mode 100644
index 0000000..64f49a6
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/service/PostService.java
@@ -0,0 +1,58 @@
+package com.com.cnu.devlog_springboot.service;
+
+import com.com.cnu.devlog_springboot.exception.DevlogException;
+import com.com.cnu.devlog_springboot.model.Post;
+import com.com.cnu.devlog_springboot.model.request.PostRequest;
+import com.com.cnu.devlog_springboot.repository.PostRepository;
+import com.com.cnu.devlog_springboot.type.ErrorCode;
+import com.com.cnu.devlog_springboot.type.Tag;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import lombok.RequiredArgsConstructor;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Repository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class PostService {
+  private final PostRepository postRepository;
+
+  public List<Post> getPosts(@Nullable Tag tag) {
+    if (tag != null) {
+      return postRepository.findAllByTag(tag);
+    }
+    return postRepository.findAll();
+  }
+
+  public Post createPost(PostRequest postRequest) {
+    return postRepository.save(new Post(
+            null,
+            postRequest.title(),
+            postRequest.content(),
+            postRequest.tag()
+    ));
+  }
+
+  public Post updatePost(Integer postId, PostRequest postRequest) {
+    return postRepository.findById(postId)
+            .map(post -> {
+              post.setTitle(postRequest.title());
+              post.setContents(postRequest.content());
+              return postRepository.save(post);
+            })
+            .orElseThrow(() -> new DevlogException(ErrorCode.POST_NOT_FOUND));
+  }
+
+  public Post getPost(Integer postId) {
+    return postRepository.findById(postId)
+            .orElseThrow(() -> new RuntimeException(String.valueOf(ErrorCode.POST_NOT_FOUND)));
+  }
+
+  public void deletePost(Integer postId) {
+    postRepository.findById(postId)
+// 같은코드 .ifPresent(post -> postRepository.delete(post))
+            .ifPresent(postRepository::delete);
+  }
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/service/ProjectService.java b/src/main/java/com/com/cnu/devlog_springboot/service/ProjectService.java
new file mode 100644
index 0000000..2a9971b
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/service/ProjectService.java
@@ -0,0 +1,56 @@
+package com.com.cnu.devlog_springboot.service;
+
+import com.com.cnu.devlog_springboot.exception.DevlogException;
+import com.com.cnu.devlog_springboot.model.Project;
+import com.com.cnu.devlog_springboot.model.request.ProjectRequest;
+import com.com.cnu.devlog_springboot.repository.ProjectRepository;
+import com.com.cnu.devlog_springboot.type.ErrorCode;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class ProjectService {
+
+  private final ProjectRepository projectRepository;
+
+  public Project createProject(ProjectRequest projectRequest) {
+    return projectRepository.save(new Project(
+            null,
+            projectRequest.title(),
+            projectRequest.summary(),
+            projectRequest.contents(),
+            projectRequest.startDate(),
+            projectRequest.endDate()
+    ));
+  }
+
+  public List<Project> getProjects() {
+    return projectRepository.findAll();
+  }
+
+  public Project getProject(Integer projectId) {
+    return projectRepository.findById(projectId)
+            .orElseThrow(() -> new DevlogException(ErrorCode.PROJECT_NOT_FOUND));
+  }
+
+  public Project updateProject(Integer projectId, ProjectRequest projectRequest) {
+    return projectRepository.findById(projectId)
+            .map(project -> {
+              project.setTitle(projectRequest.title());
+              project.setContents(projectRequest.contents());
+              project.setSummary(projectRequest.summary());
+              project.setStartDate(projectRequest.startDate());
+              project.setEndDate(projectRequest.endDate());
+              return projectRepository.save(project);
+            })
+            .orElseThrow(() -> new DevlogException(ErrorCode.PROJECT_NOT_FOUND));
+
+  }
+
+  public void deletePost(Integer projectId) {
+    projectRepository.findById(projectId)
+            .ifPresent(projectRepository::delete);
+  }
+}
\ No newline at end of file
diff --git a/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java b/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java
new file mode 100644
index 0000000..d9cba9c
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java
@@ -0,0 +1,27 @@
+package com.com.cnu.devlog_springboot.type;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public enum ErrorCode {
+  POST_NOT_FOUND(
+          HttpStatus.NOT_FOUND,
+          4000,
+          "해당 게시글을 찾을 수 없습니다."),
+
+  PROJECT_NOT_FOUND(
+          HttpStatus.NOT_FOUND,
+          4001,
+          "해당 프로젝트를 찾을 수 없습니다.");
+
+  private final HttpStatus httpStatus;
+  private final Integer errorCode;
+  private final String description;
+
+  ErrorCode(HttpStatus httpStatus, Integer errorCode, String description) {
+    this.httpStatus = httpStatus;
+    this.errorCode = errorCode;
+    this.description = description;
+  }
+}
\ No newline at end of file