I am Mobile Application Developer specially Android and Flutter. Have been involved with this platform for more than 3.5 years. So far I have come to know about basic android architecture, firebase, push notification, google map and services, google places SDK, integration of API and parsing JSON data, location tracking, usage of databases like: MySQL, SQLite, ROOM, sharedpreferences, libraries: Retrofit, volley, RxJava, eventBus, about MVVM architecture, jetpack... etc.