diff --git a/.github/workflows/backend_ci.yml b/.github/workflows/backend_ci.yml
index 8b13789..d5f7e42 100644
--- a/.github/workflows/backend_ci.yml
+++ b/.github/workflows/backend_ci.yml
@@ -1 +1,87 @@
+name: Backend CI
 
+on:
+  pull_request:
+    branches: [master, dev]
+    paths:
+      - "prothsync/**"
+
+defaults:
+  run:
+    working-directory: prothsync
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:18
+        env:
+          POSTGRES_DB: prothsync_test
+          POSTGRES_USER: test
+          POSTGRES_PASSWORD: test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd="pg_isready -U test"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
+
+      redis:
+        image: redis:7-alpine
+        ports:
+          - 6379:6379
+        options: >-
+          --health-cmd="redis-cli ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
+
+    steps:
+      # 1) 소스 체크아웃
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # 2) Java 17 설정
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      # 3) Gradle 캐시 (빌드 속도 향상)
+      - name: Cache Gradle packages
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('prothsync/**/*.gradle*', 'prothsync/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      # 4) Gradle 실행 권한 부여
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      # 5) 빌드 + 테스트 실행
+      - name: Build & Test
+        env:
+          POSTGRES_DB: prothsync_test
+          POSTGRES_USER: test
+          POSTGRES_PASSWORD: test
+          REDIS_PASSWORD: ""
+          JWT_SECRET: ci-test-secret-key-that-is-long-enough-for-hmac-sha256
+          KAKAO_REST_API_KEY: test-key
+        run: ./gradlew build
+
+      # 6) 테스트 결과 리포트 업로드 (실패 시 디버깅용)
+      - name: Upload test reports
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-test-reports
+          path: prothsync/build/reports/tests/
+          retention-days: 7
diff --git a/.github/workflows/frontend_ci.yml b/.github/workflows/frontend_ci.yml
index 8b13789..79826f0 100644
--- a/.github/workflows/frontend_ci.yml
+++ b/.github/workflows/frontend_ci.yml
@@ -1 +1,46 @@
+name: Frontend CI
 
+on:
+  pull_request:
+    branches: [master, dev]
+    paths:
+      - "prothsyncFront/**"
+
+defaults:
+  run:
+    working-directory: prothsyncFront
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      # 1) 소스 체크아웃
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # 2) Node.js 설정
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: prothsyncFront/package-lock.json
+
+      # 3) 의존성 설치 (CI 환경에서는 npm ci 사용)
+      - name: Install dependencies
+        run: npm ci
+
+      # 4) 빌드 검증
+      - name: Build
+        run: npm run build
+
+      # ── 아래는 나중에 추가할 때 주석 해제 ──
+
+      # 5) ESLint (lint 설정 후 활성화)
+      # - name: Lint
+      #   run: npm run lint
+
+      # 6) 테스트 (Vitest 등 설정 후 활성화)
+      # - name: Test
+      #   run: npm run test
diff --git a/prothsync/src/main/java/com/prothsync/prothsync/entity/user/User.java b/prothsync/src/main/java/com/prothsync/prothsync/entity/user/User.java
index bbf2fd0..afabd8c 100644
--- a/prothsync/src/main/java/com/prothsync/prothsync/entity/user/User.java
+++ b/prothsync/src/main/java/com/prothsync/prothsync/entity/user/User.java
@@ -27,7 +27,7 @@
 public class User extends BaseEntity {
 
     private static final Pattern EMAIL_PATTERN =
-        Pattern.compile("^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$");
+        Pattern.compile("^[A-Za-z0-9+_]+([.-][A-Za-z0-9+_]+)*@[A-Za-z0-9]+([.-][A-Za-z0-9]+)*\\.[A-Za-z]{2,}$");
 
     private static final int BIO_MAX_LENGTH = 200;
 
diff --git a/prothsync/src/test/java/com/prothsync/prothsync/UserTest.java b/prothsync/src/test/java/com/prothsync/prothsync/UserTest.java
index 86f0355..ab959b4 100644
--- a/prothsync/src/test/java/com/prothsync/prothsync/UserTest.java
+++ b/prothsync/src/test/java/com/prothsync/prothsync/UserTest.java
@@ -25,7 +25,7 @@ class UserTest {
     private static final LocalDate VALID_BIRTHDAY = LocalDate.of(1990, 1, 1);
     private static final String VALID_ADDRESS = "서울시 강남구 테헤란로 123";
     private static final String VALID_EMAIL = "test@example.com";
-    private static final UserType VALID_USER_TYPE = UserType.DENTIST;
+    private static final UserType VALID_USER_TYPE = UserType.DENTAL_CLINIC;
 
     @Nested
     @DisplayName("사용자 생성 테스트")
@@ -468,11 +468,11 @@ void createUser_WithDentistType_Success() {
                 VALID_BIRTHDAY,
                 VALID_ADDRESS,
                 VALID_EMAIL,
-                UserType.DENTIST
+                UserType.DENTAL_CLINIC
             );
 
             // then
-            assertThat(user.getUserType()).isEqualTo(UserType.DENTIST);
+            assertThat(user.getUserType()).isEqualTo(UserType.DENTAL_CLINIC);
         }
 
         @Test
@@ -486,11 +486,11 @@ void createUser_WithDentalLabOwnerType_Success() {
                 VALID_BIRTHDAY,
                 VALID_ADDRESS,
                 VALID_EMAIL,
-                UserType.DENTAL_LAB_OWNER
+                UserType.DENTAL_LAB
             );
 
             // then
-            assertThat(user.getUserType()).isEqualTo(UserType.DENTAL_LAB_OWNER);
+            assertThat(user.getUserType()).isEqualTo(UserType.DENTAL_LAB);
         }
 
         @Test