While we do not have a specific developer to recommend, you might check out a service like Thumbtack where you can find a professional for just about any type of service:
One app to find a local professional to help you accomplish just about any task
Just look for “Mobile App Developers”.
There are other similar freelance services out there like Fiver “Pro”. The Pro version of this site is a collection of vetted developers with a proven track record.
https://www.fiverr.com/pro/categories/programming-tech/mobile-app-services
Hopefully that gives you a place to start and other users will chime in with their recommendations as well!