Multi-Platform App Development

I need a multi-platform app (iOS and Android) that includes user authentication features. The app should be ready for submission to the app store.

Key requirements:
- User authentication
- Biometric authentication
- Two-factor verification

Ideal skills and experience:
- Experience in developing iOS and Android apps
- Strong background in implementing secure user authentication
- Familiarity with biometric authentication methods
- Knowledge of app store submission processes

Please provide examples of similar work.