Flutter Matrimony App Development

I'm seeking a Flutter developer to create a Matrimony app with various features including:

- **Mobile OTP Login**: This feature is critical for the success of the app. It should be seamless and secure.
- **Calling Features**: Users should be able to make voice calls within the app.
- **Data Security**: Regular data backups are required to ensure user data is safe.

The app will also need to be hosted on the Android Play Store, integrated with AdMob for monetization, and equipped with a UPI payment gateway.

Ideal skills and experience:
- Strong expertise in Flutter development.
- Experience implementing secure login systems.
- Familiarity with integrating calling features in an app.
- Knowledge of data security best practices, particularly regular data backups.
- Previous experience with app deployment on the Android Play Store.
- Understanding of AdMob and UPI payment gateway integration.

Please include examples of similar projects you've completed in your proposal.