BillFusion OS – Unified Billing System

• Tech Stack: Python 3.8+, FastAPI, React (Vite + TS), MySQL 8.0, Excel Backend, Telegram Bot, WhatsApp Desktop Automation, TailwindCSS
• GitHub URL: Repository Link

BillFusion OS is a full-scale, production-ready billing and inventory management system that unifies POS operations, accounting, and reporting into a single, modern platform. Designed for both offline Windows deployments and scalable Linux cloud deployments, it offers a hybrid architecture with dual storage support (MySQL or Excel).

The system delivers a rich multi-interface experience through a FastAPI backend, a React-based POS dashboard, Telegram bot access, CLI tools, and WhatsApp desktop automation. It includes two billing engines (simple & weighted), UPI QR generation, PDF invoicing, automated backups, and complete RBAC security.

• Billing System – multi-item bills, discounts, payment modes, weighted pack optimization, PDF invoices
• Inventory Management – categories, packs, stock tracking, low-stock alerts, import/export
• Customer Management – customer profiles, purchase history, intelligent search
• Accounts & Reports – sales analytics, cash/digital tracking, expense records, export to CSV/Excel/PDF
• Multi-Interface Access – React POS dashboard, FastAPI REST API, Telegram bot, WhatsApp automation, CLI

Built with a modular, scalable architecture and extensive documentation, BillFusion OS is ideal for modern retailers, local businesses, and cloud-based deployments. Its flexible design makes it easy to extend with features like real-time notifications, barcode scanning, and mobile apps.