Cross-Platform E-commerce App Development

I'm seeking an experienced app developer to create a cross-platform e-commerce app for both iOS and Android. The app must include payment gateway integration.

Key Requirements:
- Develop for both iOS and Android platforms
- Integrate a secure and reliable payment gateway
- Ensure a user-friendly interface and seamless navigation

Ideal Skills and Experience:
- Proven experience in developing e-commerce apps
- Strong expertise in payment gateway integration
- Proficiency in both iOS and Android development
- Excellent UI/UX design skills
- Strong problem-solving abilities and attention to detail

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