React Native App Enhancement

I'm seeking a React Native specialist to update my existing application. The primary focus is to incorporate user authentication as a new feature.

Key Tasks:
- Implement SMS auto-read feature without any 3rd party library for both Android and IOS
- Access the Mobile number from the device using React Native for both Android and IOS
- Implement user authentication into the app
- Ensure seamless integration with existing app functionality
- Test for bugs or performance issues post-update

Ideal Skills:
- Extensive experience in React Native
- Previous work with user authentication features
- Strong debugging and performance optimization skills