Professional Project Specification: Offline-First Retail POS & Inventory Project Title: Development of an Offline-First POS & Inventory Management System (Cross- Platform) 1. Project Overview We are seeking a high-caliber developer or agency to build a robust, Offline-First Point of Sale (POS) and Inventory Management System. The application must serve diverse retail environments including supermarkets (high-volume scanning), boutiques (variants/sizes), and general retail shops. The critical success factor is the system's ability to perform 100% of sales and inventory tasks without an internet connection, with seamless background synchronization to a cloud-based administrative dashboard once connectivity is restored. 2. Core Feature Modules A. Point of Sale (Terminal Interface) ● High-Speed Checkout: Optimized for both touchscreens and keyboard/mouse setups. ● Offline Operation: Full capability to process sales, search products, and apply ● ● discounts while offline. Peripheral Integration: Native support for ESC/POS thermal printers, barcode scanners, and electronic cash drawers. Multi-Payment Support: Split payments between cash, card, and mobile wallets. ● Held/Parked Orders: Ability to save a cart and resume it later (useful for busy supermarket queues). B. Advanced Inventory Management ● SKU & Variant Management: Support for "Parent" products with variants (e.g., Shirt -> Small, Medium, Large; Red, Blue). ● Stock Tracking: Real-time local stock deductions and low-stock threshold notifications. ● Batch & Expiry Tracking: (Essential for supermarkets) tracking items by shelf life. ● Barcode Generation: Ability to generate and print labels for unbranded items. C. Data Synchronization & Security ● Bi-Directional Sync: Local-to-Cloud (sales, logs) and Cloud-to-Local (new products, price changes). ● Conflict Resolution: Automated logic to handle data discrepancies between multiple offline terminals. ● Role-Based Access Control (RBAC): Distinct permissions for Cashiers, Store Managers, and Super-Admins. ● Local Encryption: Encrypted local database to protect sensitive business data. D. Reporting & Back-Office ● ● Automated EOD: End-of-day (X/Z) reports generated locally. Cloud Dashboard: Centralized web view for owners to monitor multiple branches. ● Exporting: One-click exports for accounting (CSV, Excel, PDF). 3. Technical Requirements ● ● ● ● Architecture: Offline-first using a local database (e.g., SQLite, Realm, or PouchDB). Front-End: Modern, responsive framework (e.g., React/Electron, Flutter, or .NET MAUI). Back-End (Cloud): Secure API (Node.js, Python, or Go) with a robust database (PostgreSQL/MongoDB). Hardware Compatibility: Standard Windows/Android drivers for retail peripherals. 4. Deliverables ● ● ● ● Fully Functional Application: Compiled installer for the target OS (Windows/ Android/macOS). Admin Web Portal: For remote management and analytics. Source Code: Well-documented code hosted on a private repository (GitHub/ GitLab). User Manual: Brief documentation for staff training and system setup.