E-commerce Android App Development

I'm looking for a skilled Android developer to build a comprehensive E-commerce app with complete backend development.

Key Features:
- User login and registration: The app should have a seamless and secure process for user sign-up and login.
- Product reviews and ratings: I want users to be able to share their opinions and experiences with products.
- Secure payment gateway: A vital part of this project is the integration of a reliable and secure payment system.


Ideal Skills and Experience:
- Extensive experience in Android app development, particularly in the E-commerce sector.
- Proven track record in creating secure and user-friendly login systems.
- Familiarity with implementing product review and rating systems in an app.
- In-depth knowledge of integrating secure payment gateways.
- Experience in complete backend development, managing product inventory and user data.
- Adhaar API integrations with the system

Please provide examples of relevant past projects in your proposal.