Cross-Platform React Native App Development

I need a skilled mobile application developer to create a cross-platform app using React Native.

Essential Feature:
- User Authentication

Ideal Skills and Experience:
- Expertise in React Native
- Experience with cross-platform mobile app development
- Strong background in implementing secure user authentication
- Familiarity with mobile app deployment on iOS and Android platforms
- Ability to collaborate and communicate effectively throughout the project

Please provide examples of previous work and your approach to ensuring a smooth user authentication process.