Ecommerce Android App for Mini Mart

I need an experienced mobile app developer to create an ecommerce android application for my mini mart. The app should be focused on selling groceries.

Key Requirements:
- User Authentication: The app must have a phone number verification system for user authentication. This is to ensure a seamless and secure login experience for users.
- Product Categories: The app will primarily deal with groceries. Therefore, the interface should be simple and easy to navigate, as it will cater to a wide range of customers.
- Payment Methods: The app should support payments via Credit/Debit Card and Mpesa. It's crucial that the payment system is secure and user-friendly.

Ideal Skills and Experience:
- Proven experience in developing ecommerce applications
- Expertise in Android app development
- Familiarity with secure user authentication systems
- Experience in integrating diverse payment methods into apps
- Ability to create simple and intuitive user interfaces.

I look forward to seeing your proposals.