| Flutter + Dart (nâng cao) | Native cơ bản (Swift/Kotlin sửa được code) |
| SOLID + design patterns (MVVM/Bloc/Riverpod) | REST + WebSocket + JSON nâng cao |
| Push Notification (FCM + APNs) + Deep link | Platform Channel (native bridge) |
| Secure storage + HTTPS + token-based auth | Git advanced (rebase / conflict / PR review) |
| WebRTC / video call SDK | CI/CD (Codemagic/Bitrise/Fastlane) | Performance profiling | Certificate pinning |
| Multi-flavor build | In-app purchase / billing | A/B testing + analytics | Modular architecture |