React Native/Expo App Enhancement

I have an existing React Native/Expo app that is already working on Android and iOS. I’m looking for an experienced developer to finish a few features and polish the app before release. Main work needed: Improve/fix map functionality, make map search work more like GPS/location search, fix the radius feature, add voice messages to direct and group chats, add short video messaging up to 60 seconds, ensure camera, microphone, location, and media permissions work correctly, change the overall app color/theme, make minor text/font-size adjustments, and test everything on both Android and iOS. Work must be done on a separate Git branch so the stable version stays protected. I will also require an NDA/IP agreement before GitHub access. Please include your hourly rate, estimated hours or total cost, and links to any React Native/Expo apps you’ve worked on that are currently live in the App Store or Google Play.