I’m looking to launch a straightforward clothing store app that runs seamlessly on both iOS and Android from a single code-base. The must-have feature is a reliable shopping cart where shoppers can select size, colour, update quantities, apply promo codes and move smoothly to checkout. Key details I need covered: • Cross-platform build (Flutter, React Native or similar) compiling to iOS & Android. • Shopping cart flow tied into Stripe or PayPal, with real-time subtotal and tax updates. • Lightweight product catalogue screen pulling data from my existing REST/JSON endpoints (I’ll provide these). • Dual authentication: classic email + password and social sign-ins (Google, Apple, Facebook). • Clean, modern UI that fits a fashion brand aesthetic and is easy to localise later. • Setup instructions or an admin endpoint list so I can upload new items, prices and images without touching code. A short demo video or TestFlight/APK build at milestone hand-off will help me verify the cart flow and login options. Code must be version-controlled (Git) and clearly commented so my in-house designer can make minor tweaks after delivery. If you’ve built retail apps before and can reference live examples, that will make the decision easy.