Mobile App Cognito Auth Integration

I need to integrate AWS Cognito authentication into a mobile application, for react native expo app. authentication has to be phone number based OTP authentication (Passwordless).

Key Requirements:
- Implement AWS Cognito for user authentication
- Support react native expo
- Create a seamless, user-friendly login experience

Ideal Skills:
- Experience with AWS Cognito
- Proficiency in mobile app development for react native expo
- Strong background in creating authentication flows