My Android developer is an hacker, what to do?

[Kyamites Kati]

Hi, just discover that my Android app developer is probably an hacker, what cann i do about this?
If i alert google, they will probably delete the app but what happen to the developer/hacker?

How can i force the hacker/developer to clean the code, if he is on the other side of the planet?
I payed for the app by bank deposit, so i got his contct details.