Hi, I am Nicolay from Ukraine
I have already experience in cooperation android devices and controller Arduino via BT.
Aalso I considered the question of interaction iBeacon with android devices via Bluetooth Low Energy.
Also, I have experience with various programming for Android, such as sound effects, voice recorder, sensors, SQLite, API integration, Google analytics and maps API, geocoder, etc. So I think that your job will not be a problem for me.
In my profile, you can see portfolio already completed works.
Kind regards