diff --git a/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java b/src/main/java/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
similarity index 88%
rename from src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
rename to src/main/java/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
index 6739bf0..5764389 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
+++ b/src/main/java/com/cnu/devlog_springboot/DevlogSpringbootApplication.java
@@ -1,4 +1,4 @@
-package com.com.cnu.devlog_springboot;
+package com.cnu.devlog_springboot;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
diff --git a/src/main/java/com/com/cnu/devlog_springboot/config/WebMVCConfig.java b/src/main/java/com/cnu/devlog_springboot/config/WebMVCConfig.java
similarity index 91%
rename from src/main/java/com/com/cnu/devlog_springboot/config/WebMVCConfig.java
rename to src/main/java/com/cnu/devlog_springboot/config/WebMVCConfig.java
index a043ae2..54e42cc 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/config/WebMVCConfig.java
+++ b/src/main/java/com/cnu/devlog_springboot/config/WebMVCConfig.java
@@ -1,4 +1,4 @@
-package com.com.cnu.devlog_springboot.config;
+package com.cnu.devlog_springboot.config;
 
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.config.annotation.CorsRegistry;
diff --git a/src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java b/src/main/java/com/cnu/devlog_springboot/controller/PostController.java
similarity index 86%
rename from src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java
rename to src/main/java/com/cnu/devlog_springboot/controller/PostController.java
index 7d6847f..22f87cd 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/controller/PostController.java
+++ b/src/main/java/com/cnu/devlog_springboot/controller/PostController.java
@@ -1,8 +1,8 @@
-package com.com.cnu.devlog_springboot.controller;
+package 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.cnu.devlog_springboot.model.Post;
+import com.cnu.devlog_springboot.service.PostService;
+import com.cnu.devlog_springboot.model.request.PostRequest;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
diff --git a/src/main/java/com/cnu/devlog_springboot/controller/ProjectController.java b/src/main/java/com/cnu/devlog_springboot/controller/ProjectController.java
new file mode 100644
index 0000000..0c712fc
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/controller/ProjectController.java
@@ -0,0 +1,46 @@
+package com.cnu.devlog_springboot.controller;
+
+import com.cnu.devlog_springboot.service.ProjectService;
+import com.cnu.devlog_springboot.model.Project;
+import com.cnu.devlog_springboot.model.request.ProjectRequest;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/projects")
+@RequiredArgsConstructor
+public class ProjectController {
+    // GET /projects
+    public final ProjectService projectService;
+
+    @GetMapping
+    public List<Project> getAllProjects() {
+        return projectService.getAllProjects();
+    }
+
+    @GetMapping("{projectId}")
+    public ResponseEntity<Project> getProjectById(@PathVariable Integer projectId) {
+        Project project = projectService.getProject(projectId);
+        return ResponseEntity.ok(project);
+    }
+
+    @PostMapping
+    public ResponseEntity<Project> createProject(@RequestBody ProjectRequest projectRequest) {
+        return ResponseEntity.ok(projectService.createProject(projectRequest));
+    }
+
+    @PutMapping("{projectId}")
+    public ResponseEntity<Project> updateProject(@PathVariable Integer projectId, @RequestBody ProjectRequest projectRequest) {
+        Project project = projectService.updateProject(projectId, projectRequest);
+        return ResponseEntity.ok(project);
+    }
+
+    @DeleteMapping("{projectId}")
+    public ResponseEntity<Void> deleteProject(@PathVariable Integer projectId) {
+        projectService.deleteProject(projectId);
+        return ResponseEntity.noContent().build();
+    }
+}
diff --git a/src/main/java/com/cnu/devlog_springboot/exception/DevlogException.java b/src/main/java/com/cnu/devlog_springboot/exception/DevlogException.java
new file mode 100644
index 0000000..2d66556
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/exception/DevlogException.java
@@ -0,0 +1,11 @@
+package com.cnu.devlog_springboot.exception;
+
+import com.cnu.devlog_springboot.type.ErrorCode;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class DevlogException extends RuntimeException {
+    private final ErrorCode errorCode;
+}
diff --git a/src/main/java/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java b/src/main/java/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java
new file mode 100644
index 0000000..4265630
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/exception/GlobalExceptionHandler.java
@@ -0,0 +1,29 @@
+package com.cnu.devlog_springboot.exception;
+
+import com.cnu.devlog_springboot.model.ErrorResponse;
+import com.cnu.devlog_springboot.type.ErrorCode;
+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> handleDevlogException(
+            final HttpServletRequest request,
+            final DevlogException e
+    ) {
+        final ErrorCode errorCode = e.getErrorCode();
+        return ResponseEntity.status(e.getErrorCode().getHttpStatus())
+                .body(
+                        new ErrorResponse(
+                                errorCode.getDescription(),
+                                errorCode.getHttpStatus().value(),
+                                errorCode.getErrorCode(),
+                                request.getRequestURI()
+                        )
+                );
+    }
+}
diff --git a/src/main/java/com/cnu/devlog_springboot/model/ErrorResponse.java b/src/main/java/com/cnu/devlog_springboot/model/ErrorResponse.java
new file mode 100644
index 0000000..e6bfa16
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/model/ErrorResponse.java
@@ -0,0 +1,9 @@
+package com.cnu.devlog_springboot.model;
+
+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/model/Post.java b/src/main/java/com/cnu/devlog_springboot/model/Post.java
similarity index 80%
rename from src/main/java/com/com/cnu/devlog_springboot/model/Post.java
rename to src/main/java/com/cnu/devlog_springboot/model/Post.java
index 51f5b6e..9927c9d 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/model/Post.java
+++ b/src/main/java/com/cnu/devlog_springboot/model/Post.java
@@ -1,6 +1,6 @@
-package com.com.cnu.devlog_springboot.model;
+package com.cnu.devlog_springboot.model;
 
-import com.com.cnu.devlog_springboot.type.Tag;
+import com.cnu.devlog_springboot.type.Tag;
 import jakarta.persistence.*;
 import lombok.*;
 
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/Project.java b/src/main/java/com/cnu/devlog_springboot/model/Project.java
similarity index 92%
rename from src/main/java/com/com/cnu/devlog_springboot/model/Project.java
rename to src/main/java/com/cnu/devlog_springboot/model/Project.java
index 29d0b72..bf38d8b 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
+++ b/src/main/java/com/cnu/devlog_springboot/model/Project.java
@@ -1,4 +1,4 @@
-package com.com.cnu.devlog_springboot.model;
+package com.cnu.devlog_springboot.model;
 
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
diff --git a/src/main/java/com/cnu/devlog_springboot/model/request/PostRequest.java b/src/main/java/com/cnu/devlog_springboot/model/request/PostRequest.java
new file mode 100644
index 0000000..0dc91fe
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/model/request/PostRequest.java
@@ -0,0 +1,10 @@
+package com.cnu.devlog_springboot.model.request;
+
+import com.cnu.devlog_springboot.type.Tag;
+
+public record PostRequest(
+        String title,
+        String contents,
+        Tag tag
+) {
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java b/src/main/java/com/cnu/devlog_springboot/model/request/ProjectRequest.java
similarity index 78%
rename from src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
rename to src/main/java/com/cnu/devlog_springboot/model/request/ProjectRequest.java
index 2ae3a17..6ffb05b 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
+++ b/src/main/java/com/cnu/devlog_springboot/model/request/ProjectRequest.java
@@ -1,4 +1,4 @@
-package com.com.cnu.devlog_springboot.model.request;
+package com.cnu.devlog_springboot.model.request;
 
 import java.time.LocalDate;
 
diff --git a/src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java b/src/main/java/com/cnu/devlog_springboot/repository/PostRepository.java
similarity index 77%
rename from src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java
rename to src/main/java/com/cnu/devlog_springboot/repository/PostRepository.java
index bb39395..70b0693 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/repository/PostRepository.java
+++ b/src/main/java/com/cnu/devlog_springboot/repository/PostRepository.java
@@ -1,6 +1,6 @@
-package com.com.cnu.devlog_springboot.repository;
+package com.cnu.devlog_springboot.repository;
 
-import com.com.cnu.devlog_springboot.model.Post;
+import com.cnu.devlog_springboot.model.Post;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
diff --git a/src/main/java/com/cnu/devlog_springboot/repository/ProjectRepository.java b/src/main/java/com/cnu/devlog_springboot/repository/ProjectRepository.java
new file mode 100644
index 0000000..19a884a
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/repository/ProjectRepository.java
@@ -0,0 +1,13 @@
+package com.cnu.devlog_springboot.repository;
+
+import com.cnu.devlog_springboot.model.Project;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface ProjectRepository extends JpaRepository<Project, Integer> {
+    //    Project save(Project project);
+    //    List<Project> findAll();
+    //    Optional<Project> findById(Integer projectId);
+    //    void delete(Project project);
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/service/PostService.java b/src/main/java/com/cnu/devlog_springboot/service/PostService.java
similarity index 61%
rename from src/main/java/com/com/cnu/devlog_springboot/service/PostService.java
rename to src/main/java/com/cnu/devlog_springboot/service/PostService.java
index 3823d7a..5df9c12 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/service/PostService.java
+++ b/src/main/java/com/cnu/devlog_springboot/service/PostService.java
@@ -1,8 +1,10 @@
-package com.com.cnu.devlog_springboot.service;
+package com.cnu.devlog_springboot.service;
 
-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.cnu.devlog_springboot.exception.DevlogException;
+import com.cnu.devlog_springboot.model.Post;
+import com.cnu.devlog_springboot.type.ErrorCode;
+import com.cnu.devlog_springboot.model.request.PostRequest;
+import com.cnu.devlog_springboot.repository.PostRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -33,16 +35,17 @@ public Post updatePost(Integer postId, PostRequest postRequest) {
                     post.setContents(postRequest.contents());
                     return postRepository.save(post);
                 })
-                .orElse(null);
+                .orElseThrow(() -> new DevlogException(ErrorCode.POST_NOT_FOUND));
     }
 
     public Post getPost(Integer postId) {
         return postRepository.findById(postId)
-                .orElse(null);
+                .orElseThrow(() -> new DevlogException(ErrorCode.POST_NOT_FOUND));
     }
 
     public void deletePost(Integer postId) {
-        postRepository.findById(postId)
-                .ifPresent(postRepository::delete);
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new DevlogException(ErrorCode.POST_NOT_FOUND));
+        postRepository.delete(post);
     }
 }
diff --git a/src/main/java/com/cnu/devlog_springboot/service/ProjectService.java b/src/main/java/com/cnu/devlog_springboot/service/ProjectService.java
new file mode 100644
index 0000000..6258562
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/service/ProjectService.java
@@ -0,0 +1,55 @@
+package com.cnu.devlog_springboot.service;
+
+import com.cnu.devlog_springboot.type.ErrorCode;
+import com.cnu.devlog_springboot.exception.DevlogException;
+import com.cnu.devlog_springboot.model.Project;
+import com.cnu.devlog_springboot.model.request.ProjectRequest;
+import com.cnu.devlog_springboot.repository.ProjectRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@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 Project getProject(Integer projectId) {
+        return projectRepository.findById(projectId).orElseThrow(()
+                -> new DevlogException(ErrorCode.PROJECT_NOT_FOUND));
+    }
+
+    public List<Project> getAllProjects() {
+        return projectRepository.findAll();
+    }
+
+    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 deleteProject(Integer projectId) {
+        Project project = projectRepository.findById(projectId)
+                .orElseThrow(() -> new DevlogException(ErrorCode.PROJECT_NOT_FOUND));
+        projectRepository.delete(project);
+    }
+}
diff --git a/src/main/java/com/cnu/devlog_springboot/type/ErrorCode.java b/src/main/java/com/cnu/devlog_springboot/type/ErrorCode.java
new file mode 100644
index 0000000..2e14423
--- /dev/null
+++ b/src/main/java/com/cnu/devlog_springboot/type/ErrorCode.java
@@ -0,0 +1,20 @@
+package com.cnu.devlog_springboot.type;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public enum ErrorCode {
+    POST_NOT_FOUND(HttpStatus.NOT_FOUND, 404, "해당 게시글을 찾을 수 없습니다."),
+    PROJECT_NOT_FOUND(HttpStatus.NOT_FOUND, 404, "해당 프로젝트 글을 찾을 수 없습니다.");
+
+    private final HttpStatus httpStatus;
+    private final Integer errorCode;
+    private final String description;
+
+    ErrorCode(final HttpStatus httpStatus, final Integer errorCode, final String description) {
+        this.httpStatus = httpStatus;
+        this.errorCode = errorCode;
+        this.description = description;
+    }
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/type/Tag.java b/src/main/java/com/cnu/devlog_springboot/type/Tag.java
similarity index 63%
rename from src/main/java/com/com/cnu/devlog_springboot/type/Tag.java
rename to src/main/java/com/cnu/devlog_springboot/type/Tag.java
index ebd77de..949d165 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/type/Tag.java
+++ b/src/main/java/com/cnu/devlog_springboot/type/Tag.java
@@ -1,4 +1,4 @@
-package com.com.cnu.devlog_springboot.type;
+package com.cnu.devlog_springboot.type;
 
 public enum Tag {
     SPRINGBOOT,
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
deleted file mode 100644
index 14efa3b..0000000
--- a/src/main/java/com/com/cnu/devlog_springboot/model/request/PostRequest.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.com.cnu.devlog_springboot.model.request;
-
-import com.com.cnu.devlog_springboot.type.Tag;
-
-public record PostRequest(
-        String title,
-        String contents,
-        Tag tag
-) {
-}