Dooplicatoor: Real-Time Multi-Broker Trade Replication

Sep 2024 – Feb 2025. Joint project between registered broker Tradejini and a three-person team.

Stack: TypeScript, Express, WebSockets, Redis, PostgreSQL (Prisma), AWS EC2

Links: GitHub · Demo video

Dooplicatoor is a broker-agnostic trade replicator for Indian retail traders. Orders placed on a parent account are mirrored to many downstream accounts in real time.

• Replicated orders from one parent account to 10+ concurrent downstream accounts over persistent WebSocket connections, at >99% replication and sub-250 ms end-to-end latency.
• Abstracted three independent broker SDKs (AngelOne, CubePlus, Tradejini) behind one interface, handling divergent rate limits, reconnection behaviour and partial-failure modes.