I want simple app store, here you can study my plan. And please bid only those who are interested to work under $100k. ________________________________________ Infrastructure for my Multivendor E-Commerce Platform that supports: • Brand New (vendors) • Second Hand (users) • Toggle-based marketplace • Minimum cost, • scalable later ________________________________________ 1. SYSTEM OVERVIEW Mobile App / Web App ↓ Backend API Server ↓ PostgreSQL Database ↓ Image Storage (Bucket) • Single backend (no microservices) • Clean, low-cost, scalable base ________________________________________ 2. TECH STACK Frontend • Mobile App: Flutter or React Native • Web: React Backend • Node.js (Express or NestJS) Database • PostgreSQL Storage • Cloud Storage (images) Hosting • Google Cloud Platform CDN • Cloudflare ________________________________________ 3. CORE LOGIC (IMPORTANT) Marketplace Toggle (MAIN FEATURE) At top of app: [ Brand New ] [ Second Hand ] Behavior: • Brand New → show vendor products • Second Hand → show user listings ________________________________________ 4. DATABASE STRUCTURE (SIMPLIFIED) * Users Table • id • name • phone • password • user_type → (user / vendor) • created_at ________________________________________ Products Table • Id • Title • Price • Category • condition → (new / like_new / used) • listing_type → (brand_new / second_hand) • description • location • user_id • created_at ________________________________________ Product Images Table • id • product_id • image_url ________________________________________ Vendor Profile (optional simple) • user_id • shop_name • shop PAN certificate image (KYC) • shop_logo ________________________________________ 5. USER FLOW Buyer Open app ↓ Search / Browse ↓ Switch toggle ↓ View product ↓ Call seller ________________________________________ Seller Click “Sell” ↓ Upload images ↓ Add details ↓ Select: • Brand New / Second Hand ↓ Post ________________________________________ 6. UI REQUIREMENTS (IMPORTANT) Home Screen • Logo • Search bar (top) • Toggle (Brand New / Second Hand) • Product list ________________________________________ Product Card • Image • Title • Price • Location • Condition ________________________________________ Post Product Screen • Upload images • Title • Price • Category • Condition • Location • Toggle: Brand New / Second Hand ________________________________________ 7. DO NOT BUILD (NOW) To keep cost low: • Chat system • Payment gateway • Delivery system • Complex filters • AI features ________________________________________ 8. BASIC SECURITY • HTTPS (SSL) • Password hashing • Admin panel (basic) • Daily DB backup ________________________________________ 9. SCALABILITY (FUTURE READY) This structure allows easy upgrade: • Add chat • Add payments • Add vendor dashboard • Add multiple servers WITHOUT rebuilding system. ________________________________________ FINAL SUMMARY (FOR DEVELOPER) Build a simple marketplace app with: • Single backend (Node.js) • PostgreSQL database • Image storage bucket • Toggle system: • Brand New • Second Hand • User types: • Normal user • Vendor • Basic product posting + browsing • Contact via phone ________________________________________