I need a full-featured point-of-sale application built specifically for Windows that can run smoothly across all of my grocery locations. The system must do more than ring up sales; it has to unify every store under one database so inventory levels, customer loyalty balances, and sales reports update in real time no matter which branch makes the transaction. Core functions I have to see working: • Inventory management that tracks stock from receiving through shrinkage, supports barcode scanning, and alerts on low quantities. • Detailed sales reporting with daily, weekly, and custom period filters, plus export to CSV or Excel for accounting. • A customer loyalty program where shoppers earn and redeem points at any of our stores, with the balance synchronized instantly chain-wide. Because we operate multiple locations, the architecture should allow centralised control yet stay reliable if a branch temporarily loses its internet connection. I am open to either a cloud-hosted backend or a secure on-premise database, as long as you talk me through the pros and cons and deliver a seamless hand-over. Deliverables I expect: 1. Compiled Windows installer and all source code. 2. Schema documentation and deployment guide for the database. 3. User manual covering cashier, manager and admin tasks. 4. One round of remote training for key staff. 5. 30-day post-launch support for bug fixes. If you have previously implemented grocery or retail POS systems, especially those spanning more than one store, your insight will be invaluable. Please outline your proposed tech stack, estimated timeline, and any third-party licensing requirements when you reply.