- Kotlin
- MVP (Moxy)
- Navigation using custom views + Cicerone
- Dagger 2
- Coroutines + Flow
- Junit 4
- Firebase Auth, Firebase Database, Firebase Firestore
- Kakao
- Home screen
- Search screen
- Friends screen
- Registration (in process of refactoring)
- Chat (in process of refactoring)
- Saving messages
- Cryptography