Cross-Platform E-commerce App Development

I'm looking for a skilled developer to create an e-commerce application that works on iOS, Android, and Web platforms.

Key requirements:
- User authentication: email/password and social media logins
- Secure payment integration
- User-friendly interface and seamless navigation
- Robust backend to handle large volumes of transactions
- Experience with similar projects is a plus

Ideal skills and experience:
- Proficiency in React Native or Flutter for mobile development
- Strong knowledge of web development frameworks
- Experience with cloud databases and server management
- UI/UX design skills

Please provide examples of your previous work and a brief outline of your development approach.