I'm looking for an experienced app developer to create a shopping application for both iOS and Android platforms. The app will feature physical goods and include an item catalog and cart payment functionality. Key requirements: - User-friendly interface - Secure payment integration - Robust item catalog - Both platforms compatibility Ideal skills and experience: - Proven app development experience - Expertise in payment gateways - Strong UI/UX design skills - Experience with both iOS and Android platforms Please include your relevant experience in your application.