I have more than 5 years experience on Android, having worked with most of SDK versions (from 2.3 Gingerbread to 6.0 Marshmalow) adapting the applications to the proper layout (i.e. Holo, Material Design), having worked with several IDE (Eclipse, Android Studio). I also have a wide variety of physical devices to test the app on to ensure compatibility (different screen size smartphones, tablets, etc).
I've also been in some trainings and conferences in Google Offices (Mountan View - California), and attended the Google I/O.