05/SaaS / Real-time•2024
Collaboration Tool
Multi-user real-time workspace with live cursors and shared state
< 50msSync Latency
50 users/roomMax Concurrent
100%Data Integrity
SaaS / Real-time
Collaboration Tool
Multi-user real-time workspace with live cursors, shared state, conflict resolution, and op-transforms.
ReactTypeScriptNode.jsWebSocketsMongoDBExpressSystem Design
/01 Project Overview
A multiplayer digital canvas and document collaboration tool enabling distributed teams to ideate, draw, and write together in real time. Features live cursor broadcasting, conflict-free document synchronization, and version history rollback.
/02 The Challenge
Eliminating split-brain states and synchronization drift when multiple participants make concurrent asynchronous modifications across high-latency connections.
/03 The Solution
Architected a hybrid WebSocket server with CRDT (Conflict-Free Replicated Data Types), in-memory document state caching, and operational transformation rollback queues.
Engineering Highlights
- ✓Sub-50ms synchronization latency for collaborative editing
- ✓Conflict-free replicated data synchronization (CRDT)
- ✓Real-time teammate presence with custom cursor tracking
- ✓Full revision history with instant time-travel restoration