Design a Real-Time Feedback System for Free Weights in a Gym
Implement a real-time system that uses computer vision and machine learning algorithms to track the weight lifted by users in a free weights section of a gym. The system should be able to accurately calculate the weight lifted based on the user's form and movement pattern, provide immediate feedback to the user, and also track user performance and provide personalized coaching over time.
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I have built two collaborative editing applications and strongly recommend the CRDT approach with Yjs:
Why CRDTs over OT: CRDTs are mathematically guaranteed to converge without a central server arbitrating conflicts. This means better offline support and simpler server architecture. OT requires a central server to transform operations in order.
Tech Stack: Use Yjs for the CRDT implementation - it is production-ready and battle-tested. Pair it with TipTap or ProseMirror for the rich text editor. For WebSocket infrastructure, use the y-websocket provider or Hocuspocus for a more feature-rich solution.
Scaling: For 20 concurrent editors, a single WebSocket server handles it easily. For larger scale, use Redis pub/sub to synchronize multiple WebSocket servers.
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