Cross-Platform E-commerce App Development

I'm looking to develop a comprehensive e-commerce application for my business, similar to Amazon, where I can list and sell my physical products. The app should be available on both Android and iOS platforms, and there should also be a corresponding website.

Essential features include:
- User accounts and profiles
- Payment processing
- Product reviews and ratings

Ideal skills and experience:
- Proven experience in developing cross-platform mobile applications
- Strong background in e-commerce app development
- Expertise in setting up secure and efficient payment processing systems
- Ability to integrate user account functionalities and product review systems

Please provide a portfolio showcasing similar projects. Looking forward to your bids!