I’m building a fast-moving marketplace where customers can buy and instantly receive both physical goods and digital products. The core of the project is a mobile-first app that handles browsing, checkout, and real-time delivery or download in a single, streamlined flow. Key features I know I’ll need: • Two distinct profile types so buyers and sellers each get dashboards tailored to their roles—order history, earnings, inventory, ratings, and basic analytics. • A unified catalog that can flag items as “ship now” or “instant download,” with the correct fulfilment logic triggered automatically. • Secure payment processing, refunds, promo codes, and wallet balance. • Order-status updates pushed in real time (think WebSocket, Firebase, or similar). • An admin panel for me to moderate listings, resolve disputes, and run marketplace fees. I’m open to the tech stack, but I gravitate toward React Native or Flutter for speed of release and a robust REST or GraphQL backend. If you have a stronger recommendation, let’s discuss it along with any out-of-the-box services—Stripe, AWS, or Firebase—that can shorten development time without locking us in. Deliverables I expect for this first phase: 1. Clickable UI prototype covering all buyer/seller flows 2. Production-ready iOS and Android builds 3. Backend with documented API endpoints 4. Basic admin web console 5. Handover of source code, environment files, and deployment guide Once the MVP is live, I plan on adding advanced analytics, loyalty programs, and internationalisation, so clean, extensible code is essential. If you can hit quick turnarounds and advocate best practices, drop me a short note outlining your approach and relevant marketplace apps you’ve shipped.