Real-Time Attendance Management System
GPS-verified student attendance with 300+ concurrent WebSocket connections at sub-50ms sync. Automated bulk-absent processing cuts admin workload by 80%.
GPS-verified student attendance with 300+ concurrent WebSocket connections at sub-50ms sync. Automated bulk-absent processing cuts admin workload by 80%.
The Problem
Manual attendance in large lecture halls wastes 10+ minutes per session, is easily gamed through proxy attendance, and creates significant admin burden for processing absence records.
My Solution
A production system enabling location-verified student check-ins via GPS geofencing (50m radius). Built on FastAPI with WebSockets sustaining 300+ concurrent connections at sub-50ms synchronization across multiple workers.
Technical Architecture
Backend
Real-Time Layer
Frontend
Key Metrics
Lessons Learned
The hardest problem wasn't the GPS verification — it was Gunicorn's worker model. Each process had its own WebSocket connection pool, so state wasn't shared between workers. Users who reconnected to a different worker lost their session. I restructured the connection management layer to use shared state through Redis, which solved the session corruption issue in production.
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