I am looking to develop a full-fledged Grocery Shopping Portal App, similar to Flipkart Grocery, where users can browse groceries, place orders, make payments, and track deliveries in real time. The app should be scalable, secure, and production-ready, suitable for launching a real business. Key Features User App User Registration & Login (Mobile OTP / Email / Google) Location-based service (Delivery area check) Browse categories (Fruits, Vegetables, Dairy, Snacks, etc.) Product search & filters Add to Cart & Wishlist Multiple delivery addresses Secure Payments (UPI, Card, Wallet, COD) Order tracking (Live status) Order history & invoices Offers, coupons & discounts Push notifications (Order updates, offers) Vendor / Seller Panel Vendor login & dashboard Product management (Add/Edit/Delete) Stock & price management Order management (Accept, Pack, Dispatch) Earnings & payout reports Admin Panel (Web) Admin dashboard (Sales, Users, Orders) Manage users & vendors Category & product approval Commission & pricing control Offers & banner management Delivery partner management Analytics & reports Delivery Partner App Login & availability toggle Assigned orders lis Pickup & delivery status update Navigation (Google Maps integration) Earnings summary Tech Stack (Preferred) (Open to suggestions) Frontend (App): Flutter / React Native Backend: Node.js / Laravel / Django Database: Firebase / MySQL / PostgreSQL Admin Panel: React / Angular / Flutter Web Payments: Razorpay / Stripe / Cashfree Notifications: Firebase Cloud Messaging (FCM) Maps: Google Maps API Non-Functional Requirements Clean & modern UI/UX Fast loading & optimized performance Secure authentication & payment handling Scalable architecture Proper documentation & source code delivery Deliverables Android App (APK / AAB) iOS App (if applicable) Admin Web Panel Backend APIs Complete Source Code Deployment & setup guidance