POS Billing Platform

High-Performance Multi-Platform Billing System

Built a complete billing application ecosystem supporting desktop and mobile platforms, capable of processing 600 bills per second with real-time synchronization across devices.

Technology Stack

ElectronPythongRPCAngularTypeScriptWebSocketsMemcacheNode.js

Key Highlights

Multi-platform support (Windows, macOS, Linux, Android)
High-throughput processing: 600 bills per second
Real-time cross-device synchronization using WebSockets and Memcache
State persistence with automatic backup and restore on device restart
Offline-first architecture with queue-based sync
Admin Android app for analytics and user management
Desktop billing app with receipt printing and barcode scanning
Python gRPC server for centralized business logic

Technical Challenges

Achieving sub-second sync latency at 600 bills/second throughput
Handling state recovery gracefully after unexpected shutdowns
Managing conflicts in distributed billing across multiple devices
Optimizing Electron performance for resource-constrained POS terminals

Outcomes & Impact

Deployed to 50+ retail locations processing 100,000+ daily transactions
Achieved 99.95% uptime with automatic failover and recovery
Reduced billing time by 40% compared to previous legacy system
Zero data loss incidents due to robust state management