POS System
A comprehensive point-of-sale system designed for retail and F&B, featuring barcode scanning, real-time inventory tracking, multi-branch management, daily sales reports, staff role management, and Redis-cached product lookups for instant checkout.
The Challenge
Retailers need speed and reliability at checkout. I built this POS to handle high-frequency transactions with zero lag and real-time inventory sync across branches.
Technical Implementation
Built with a MERN stack, I used Redis for caching frequent product lookups to keep checkout times under 100ms. Multi-branch management was implemented using a shared database with branch-level isolation.
Lessons Learned
Building mission-critical business software taught me the importance of data consistency and robust error handling in high-traffic environments.