Cross-platform Reward System Application

I need a skilled developer to create a comprehensive e-commerce mobile application for both iOS and Android platforms.

Essential Requirements:
- User-friendly interface
- Secure payment gateway integration
- Product catalog with search and filter options
- User account creation and management
- Order tracking and notifications
- Review and rating system

Ideal Skills and Experience:
- Proven experience in developing e-commerce apps
- Strong knowledge of both iOS and Android development
- Expertise in UI/UX design
- Familiarity with secure payment systems
- Strong background in back-end development

Please provide a portfolio of similar projects.