Cross-Platform E-commerce App Development

I'm looking for an experienced mobile app developer to create an e-commerce application for both iOS and Android platforms. The app should provide a seamless shopping experience, integrating features like product browsing, secure payment options, user reviews, and personalized recommendations.

Key requirements:
- User-friendly interface and intuitive navigation
- Secure payment gateway integration
- Robust backend to handle large volumes of transactions
- Advanced search and filtering options
- User account creation and management
- Push notifications for promotions and updates
- High-quality graphics and responsive design

Ideal Skills and Experience:
- Proven experience in developing cross-platform mobile apps, especially in the e-commerce sector
- Strong knowledge of UI/UX design principles
- Expertise in backend development and database management
- Familiarity with payment gateway APIs
- Excellent problem-solving skills and attention to detail

Please provide examples of previous work and a timeline for project completion.