Building a real-time classroom isn't just about video streaming—it's about state synchronization. When a teacher mutes a student, that state needs to propagate instantly across all clients.

For Gradus, we needed a robust solution. After evaluating several WebRTC platforms, we integrated 100ms for its superior developer experience and scalability.

Key challenges overcome: - **Deterministic State:** Ensuring whiteboard drawings sync perfectly. - **Latency Optimization:** Keeping global latency under 200ms. - **Recording Architecture:** Implementing server-side compositing for VOD playback.