I need an experienced app developer to build an e-commerce app for both iOS and Android platforms. The app should have payment gateway integration. Essential Features: - User account creation - Product search - Payment gateway integration (must support credit/debit cards, PayPal, Apple Pay, Google Pay) Ideal Skills and Experience: - Proven experience in developing e-commerce apps - Strong knowledge of payment gateway integration - Proficiency in both iOS and Android development - Familiarity with user account management and product search functionalities - Good UI/UX design skills Please provide examples of previous work and estimated delivery time.