Building a Multi-Vendor Marketplace From Scratch: Lessons From 30,000 Lines of React By Faiz Ullah — Full-Stack Developer & Founder of DG Technology Most "build an e-commerce site" tutorials stop at a product list and a cart. They don't deal with the actual hard part: three different types of humans — customers, sellers, and admins — all needing their own secure space inside the same app, talking to each other in real time, without ever stepping on each other's data. That's ...