CoType

CoType is a real-time collaborative editor where conflict resolution is handled through a custom Sequence CRDT (LSEQ-style fractional indexing) implemented in C++ and compiled to WebAssembly for near-native client-side performance.

50+

Users

Real-time

Sync

Eventual

Consistency

Distributed Systems

What Wasn't Working

Collaborative editors face concurrent edit conflicts, high sync latency, and dependency on centralized conflict resolution, which can degrade user experience under active multi-user sessions.

The Solution

How I Fixed It

I designed a WebSocket-driven synchronization layer and implemented a custom Sequence CRDT with fractional indexing and deterministic ordering in C++, then compiled core logic to WASM so conflict resolution runs efficiently inside the browser.

Stack

Technologies Used

C++

WebAssembly

React

Node.js

Socket.io

MongoDB

CRDT

Results

Key Outcomes

✓

Supported collaborative editing for 50+ concurrent users

✓

Resolved network edit conflicts without centralized DB arbitration

✓

Achieved low-latency synchronization with WebSockets

✓

Used WASM for near-native CRDT execution in the client

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