Hello and welcome back to another exciting tutorial of GreatStack. In this video, I build and deploy a full stack AI multi-vendor e-commerce app using Next.js with a PERN-style setup (PostgreSQL + Prisma) and a real production workflow. I show you the complete demo first—customer shopping flow (shop, product details, cart, address, coupons, cash on delivery or Stripe), seller dashboard (add products, manage products, handle orders), and the admin dashboard (approve stores, manage stores, create coupons with expiry and member-only rules). I also add a premium “Plus” membership with a free trial so customers can unlock exclusive coupons and free delivery. While building, I start from my open-source GoCart template and then convert it into a fully functional app by adding authentication, database, and APIs. For auth and account management, I integrate Clerk (sign in, sign up, user profile, multi-account switching), and I use Clerk Billing for subscriptions and trials. For the database, I use Neon Postgres with Prisma models (users, products, stores, coupons, orders, ratings, addresses). For background jobs and scheduling, I integrate Inngest—like automatically deleting coupons when they expire and handling webhooks cleanly. And for media, I use ImageKit to store and optimize store logos and product images. Finally, I deploy the whole project on Vercel so you can put the live link on your resume or use it as a solid college project.