Cross-Platform E-commerce Mobile App Development

I'm looking to create a mobile app focused on e-commerce, compatible with both iOS and Android. This app should include a product catalog, shopping cart, and integrated payment gateway.

Ideal Skills and Experience:
- Cross-platform mobile app development (React Native, Flutter, etc.)
- E-commerce platform integration
- UI/UX design for e-commerce
- Secure payment gateway integration
- Familiarity with both iOS and Android development guidelines