Debugging & bundling release build for React native + Firebase app

We are in need of some urgent help to make a release build for our react-native app which uses a firebase backend. The tasks would involve debugging any outstanding issues, and creating a .apk/.ipa file we can distribute. All work needs to completed today.

Since its an urgent request we need someone who has a good amount of experience in,
1. React native(android & ios)
2. Google Firebase
3. Building apps for release on playstore/appstore