Cross-Platform E-Commerce Mobile App and Website

I'm looking for a proficient developer to create an e-commerce mobile app compatible with both iOS and Android, alongside a corresponding website. This project includes: - Setting up user accounts and profiles - Integrating a secure and reliable payment gateway - Implementing a system for product reviews and ratings The ideal candidate for this project should have substantial experience in e-commerce app development, proficiency in cross-platform mobile app development, and a solid understanding of secure payment integration. A portfolio showcasing similar past projects will be highly advantageous.