Hi,
I'm an technically sophisticated & astute IT Professional, with an experience of 6+ years in mobile application Development on Android, Windows Phone 7, Symbian and Qt, Unity3D.
Will able to do this task of decompiling APK with insertion of Airpush ad banner and compile it to APK.
There are tools available for decompiling apk.I've worked with Dex2jar .
So can perform this task within committed time frame.