Android app developer -- 2

Need to change few things like name, logo, color, adding google ads on predefined places, add one overlay instruction screen on already existing app code.
If we do this successfully, I have other 10 apps with similar changes.

Conditions:
-Payment only after work done.
-Updated Code should be provided back once you receive the payment.

We discuss more only if you are agree to this condition.
Indian freelancers preferred.
Budget: 1200 Rs.