I have already completed 40+ applications in Android.
Also, i've shared some of my skills below in Android Development Process,
Language - Kotlin, Java, RxJava (1&2)
Dependency Injection - Dagger 2
Architecture Pattern - MVVM (Jetpack With LiveData), MVP
Design Pattern - Observer, Builder, Singleton
Firebase - Online Database and Storage, Dynamic Linking, Push Notifications, Remote Config, Auth, Crashlytics, Analytics
Network Lib's - Retrofit with RxJava, Gson, OkHttp with SSL Config
Image Lib's - Glide and Picasso
Image Compressor - My own custom library
Google Api's - Map, Direction, Distance Matrix, Places, Geocoding, Geofencing, Nearby, Books, Youtube Data Api.
Devices - NFC, Bluetooth.