UPI App for Simple Transactions

I'm seeking a skilled developer to create a UPI app for both Android and iOS platforms. The primary function of the app will be to send and receive money. User authentication is required, and should be implemented via PIN or password.

Key requirements:
- Cross-platform compatibility (Android and iOS)
- Secure send/receive money functionality
- User authentication with PIN/password

Ideal skills and experience:
- Experience in developing secure financial apps
- Proficiency in both Android and iOS development
- Strong understanding of UPI and payment gateway integration
- Knowledge of implementing secure authentication methods

Please provide examples of similar work done and estimated timelines.