Hi !
If you look at my portfolio, you'll see my project Fracker, it is a user localisation based project. The skills requiered for this app match perfectly what you are asking for.
This is my first time on this platform so I don't have any reviews yet. But If you give me my chance, i would make sure to provide you a strong and quality application that you could not refuse. :)
I have years of experience with Android and few apps published on the store.
Best of luck.