React Native App Development (with Expo)

I need an experienced React Native developer to create an app based on a Figma design. The app will have approximately 30 screens and must be compatible with both iOS and Android.

Key Requirements:
- Implement push notifications
- Set up user authentication
- Integrate with an existing backend

Ideal Skills and Experience:
- Proficient in React Native
- Experience with push notifications and user authentication
- Strong background in integrating with existing backends
- Familiarity with Figma and mobile app design implementation

Please provide examples of previous work, especially with similar functionalities and backend integrations.