diff --git a/backend/eslint.config.mjs b/backend/eslint.config.mjs
index 9b15bf6..115f9a3 100644
--- a/backend/eslint.config.mjs
+++ b/backend/eslint.config.mjs
@@ -19,7 +19,9 @@ export default tseslint.config(
       },
       sourceType: 'commonjs',
       parserOptions: {
-        projectService: true,
+        projectService: {
+          allowDefaultProject: ['jest.config.js', '*.config.mjs'],
+        },
         tsconfigRootDir: import.meta.dirname,
       },
     },
@@ -53,10 +55,16 @@ export default tseslint.config(
     },
   },
   {
-    files: ['**/*.spec.ts', '**/*.e2e-spec.ts'],
+    files: [
+      '**/*.spec.ts',
+      '**/*.e2e-spec.ts',
+      'test/jest.setup.ts',
+      'test/jest-e2e.setup.ts',
+    ],
     rules: {
       '@typescript-eslint/unbound-method': 'off',
       '@typescript-eslint/no-unsafe-assignment': 'off',
+      'no-console': 'off',
     },
   }
 );
diff --git a/backend/jest.config.js b/backend/jest.config.js
new file mode 100644
index 0000000..3082a12
--- /dev/null
+++ b/backend/jest.config.js
@@ -0,0 +1,113 @@
+/**
+ * Jest Configuration for LCBP3-DMS Backend
+ *
+ * ตาม Testing Strategy spec:
+ * - Global coverage: 70% (backend overall)
+ * - Services: 80% (business logic)
+ * - Guards/Middleware: 90%
+ * - Utilities: 95%
+ *
+ * @see specs/05-Engineering-Guidelines/05-04-testing-strategy.md
+ */
+module.exports = {
+  // File extensions
+  moduleFileExtensions: ['js', 'json', 'ts'],
+
+  // Root directory for tests
+  rootDir: 'src',
+
+  // Test file pattern
+  testRegex: '.*\\.spec\\.ts$',
+
+  // TypeScript transformation
+  transform: {
+    '^.+\\.(t|j)s$': 'ts-jest',
+  },
+
+  // Coverage configuration
+  collectCoverageFrom: [
+    '**/*.(t|j)s',
+    '!**/*.d.ts',
+    '!**/index.ts',
+    '!**/database/seeds/**',
+    '!**/database/migrations/**',
+    '!**/config/**',
+    '!**/scripts/**',
+    '!**/*.module.ts',
+  ],
+  coverageDirectory: '../coverage',
+  coveragePathIgnorePatterns: ['/node_modules/', '/test/', '/dist/'],
+
+  // Test environment
+  testEnvironment: 'node',
+
+  // Cache for faster subsequent runs
+  cacheDirectory: '.jest-cache',
+
+  // Global setup after env
+  setupFilesAfterEnv: ['../test/jest.setup.ts'],
+
+  // Transform ignore patterns (ให้ Jest ประมวลผล uuid)
+  transformIgnorePatterns: ['node_modules/(?!uuid/)'],
+
+  // Coverage thresholds ตาม Testing Strategy spec
+  coverageThreshold: {
+    global: {
+      branches: 70,
+      functions: 70,
+      lines: 70,
+      statements: 70,
+    },
+    './src/modules/*/services/*.service.ts': {
+      branches: 80,
+      functions: 80,
+      lines: 80,
+      statements: 80,
+    },
+    './src/modules/*/services/*.spec.ts': {
+      branches: 80,
+      functions: 80,
+      lines: 80,
+      statements: 80,
+    },
+    './src/common/guards/*.ts': {
+      branches: 90,
+      functions: 90,
+      lines: 90,
+      statements: 90,
+    },
+    './src/common/interceptors/*.ts': {
+      branches: 90,
+      functions: 90,
+      lines: 90,
+      statements: 90,
+    },
+    './src/common/utils/*.ts': {
+      branches: 95,
+      functions: 95,
+      lines: 95,
+      statements: 95,
+    },
+  },
+
+  // Module name mapper for path aliases
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/$1',
+    '^@common/(.*)$': '<rootDir>/common/$1',
+    '^@modules/(.*)$': '<rootDir>/modules/$1',
+    '^@config/(.*)$': '<rootDir>/config/$1',
+    '^@database/(.*)$': '<rootDir>/database/$1',
+  },
+
+  // Verbose output for debugging
+  verbose: true,
+
+  // Clear mock calls between tests
+  clearMocks: true,
+
+  // Restore mock state after each test
+  restoreMocks: true,
+
+  // Maximum workers (ใช้ 50% ของ available CPUs)
+  maxWorkers: '50%',
+};
diff --git a/backend/package.json b/backend/package.json
index 5fcf170..1ad2798 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -15,12 +15,12 @@
     "start:debug": "nest start --debug --watch",
     "start:prod": "node dist/main",
     "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
-    "test": "jest --forceExit",
-    "test:debug-handles": "jest --detectOpenHandles",
-    "test:watch": "jest --watch",
-    "test:cov": "jest --coverage",
-    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "test": "jest --config jest.config.js --forceExit",
+    "test:debug-handles": "jest --config jest.config.js --detectOpenHandles",
+    "test:watch": "jest --config jest.config.js --watch",
+    "test:cov": "jest --config jest.config.js --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --config jest.config.js --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json --forceExit",
     "seed": "ts-node -r tsconfig-paths/register src/database/seeds/run-seed.ts"
   },
   "dependencies": {
@@ -115,23 +115,6 @@
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.57.1"
   },
-  "jest": {
-    "moduleFileExtensions": [
-      "js",
-      "json",
-      "ts"
-    ],
-    "rootDir": "src",
-    "testRegex": ".*\\.spec\\.ts$",
-    "transform": {
-      "^.+\\.(t|j)s$": "ts-jest"
-    },
-    "collectCoverageFrom": [
-      "**/*.(t|j)s"
-    ],
-    "coverageDirectory": "../coverage",
-    "testEnvironment": "node"
-  },
   "main": "index.js",
   "directories": {
     "test": "test"
diff --git a/backend/src/.jest-cache/haste-map-60cab15b743c6776f41d29bcac696b99-0ca4a1d6e3dfec1d63b61b0119442391-1908b04cd11e739233ee8977de00dc57 b/backend/src/.jest-cache/haste-map-60cab15b743c6776f41d29bcac696b99-0ca4a1d6e3dfec1d63b61b0119442391-1908b04cd11e739233ee8977de00dc57
new file mode 100644
index 0000000..d178c0c
Binary files /dev/null and b/backend/src/.jest-cache/haste-map-60cab15b743c6776f41d29bcac696b99-0ca4a1d6e3dfec1d63b61b0119442391-1908b04cd11e739233ee8977de00dc57 differ
diff --git a/backend/test/jest-e2e.json b/backend/test/jest-e2e.json
index 75b798f..15f6307 100644
--- a/backend/test/jest-e2e.json
+++ b/backend/test/jest-e2e.json
@@ -1,12 +1,21 @@
 {
   "moduleFileExtensions": ["js", "json", "ts"],
-  "rootDir": ".",
+  "rootDir": "..",
   "testEnvironment": "node",
   "testRegex": ".e2e-spec.ts$",
   "transform": {
     "^.+\\.(t|j)s$": "ts-jest"
   },
   "moduleNameMapper": {
+    "^@/(.*)$": "<rootDir>/src/$1",
+    "^@common/(.*)$": "<rootDir>/src/common/$1",
+    "^@modules/(.*)$": "<rootDir>/src/modules/$1",
+    "^@config/(.*)$": "<rootDir>/src/config/$1",
+    "^@database/(.*)$": "<rootDir>/src/database/$1",
     "^(\\.{1,2}/.*)\\.js$": "$1"
-  }
+  },
+  "setupFilesAfterEnv": ["<rootDir>/test/jest-e2e.setup.ts"],
+  "testTimeout": 60000,
+  "maxWorkers": 1,
+  "verbose": true
 }
diff --git a/backend/test/jest-e2e.setup.ts b/backend/test/jest-e2e.setup.ts
new file mode 100644
index 0000000..ad55c6f
--- /dev/null
+++ b/backend/test/jest-e2e.setup.ts
@@ -0,0 +1,26 @@
+/**
+ * Jest E2E Test Setup
+ *
+ * Global configuration สำหรับ E2E tests
+ * @see specs/05-Engineering-Guidelines/05-04-testing-strategy.md
+ */
+
+import 'reflect-metadata';
+
+// E2E tests ใช้เวลานานกว่า unit tests
+jest.setTimeout(60000);
+
+// Global beforeAll - สามารถใช้ setup database connection ที่นี่
+beforeAll(async () => {
+  // E2E specific setup
+});
+
+// Global afterAll - cleanup
+afterAll(async () => {
+  // E2E specific cleanup
+});
+
+// Clean up หลังแต่ละ test
+afterEach(() => {
+  jest.clearAllMocks();
+});
diff --git a/backend/test/jest.setup.ts b/backend/test/jest.setup.ts
new file mode 100644
index 0000000..fa2bd2d
--- /dev/null
+++ b/backend/test/jest.setup.ts
@@ -0,0 +1,43 @@
+/**
+ * Jest Global Setup
+ *
+ * ตั้งค่า global สำหรับทุก test file
+ * @see specs/05-Engineering-Guidelines/05-04-testing-strategy.md
+ */
+
+import 'reflect-metadata';
+
+// Global test timeout (30 วินาที)
+jest.setTimeout(30000);
+
+// Mock console methods ใน test environment
+// ลด noise ใน test output แต่ยังเก็บ error ไว้
+const originalConsole = {
+  log: console.log,
+  info: console.info,
+  warn: console.warn,
+};
+
+global.beforeAll(() => {
+  // Suppress console.log ใน test (ยกเว้น error)
+  console.log = jest.fn();
+  console.info = jest.fn();
+  console.warn = jest.fn();
+});
+
+global.afterAll(() => {
+  // Restore original console methods
+  console.log = originalConsole.log;
+  console.info = originalConsole.info;
+  console.warn = originalConsole.warn;
+});
+
+// Clean up mocks หลังจากแต่ละ test
+afterEach(() => {
+  jest.clearAllMocks();
+});
+
+// Global error handler สำหรับ unhandled promises
+process.on('unhandledRejection', (reason) => {
+  console.error('Unhandled Promise Rejection:', reason);
+});
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
index 108a3a8..e1bccf1 100644
--- a/frontend/vitest.config.ts
+++ b/frontend/vitest.config.ts
@@ -11,11 +11,20 @@ export default defineConfig({
     setupFiles: ['./vitest.setup.ts'],
     include: ['hooks/**/*.test.{ts,tsx}', 'lib/**/*.test.{ts,tsx}', 'components/**/*.test.{ts,tsx}'],
     exclude: ['**/node_modules/**', '**/.ignored_node_modules/**', '**/.next/**', '**/dist/**'],
+    testTimeout: 30000,
     coverage: {
       provider: 'v8',
       reporter: ['text', 'json', 'html'],
       include: ['hooks/**/*.ts', 'lib/**/*.ts', 'components/**/*.tsx'],
-      exclude: ['**/*.d.ts', '**/__tests__/**', '**/types/**'],
+      exclude: ['**/*.d.ts', '**/__tests__/**', '**/types/**', '**/*.test.{ts,tsx}'],
+      thresholds: {
+        global: {
+          branches: 70,
+          functions: 70,
+          lines: 70,
+          statements: 70,
+        },
+      },
     },
   },
   resolve: {