I need a comprehensive shopping app developed for both iOS and Android platforms. The app should include: Core Functionalities: - Product browsing - Shopping cart - User reviews - Fully functional payment integration - Delivery system - Migration capability with other websites Payment Methods: - Credit/Debit Cards - Mobile Wallets Ideal Skills and Experience: - Proven experience in developing cross-platform mobile applications - Strong knowledge of payment integration and security - Familiarity with delivery system implementation - Experience with website migration - UI/UX design skills for an intuitive user experience Looking for a developer who can deliver a robust and user-friendly shopping app within my budget. Please provide examples of previous work and relevant experience.