Real-time Messaging App
Dating-style chat experience with WebSocket-driven messaging, presence, and persistence. Low-latency message delivery at scale.
01 — Problem
What was in the way.
Product needed real-time chat with presence and reliable persistence — the kind of UX where every dropped message or a stale 'typing' indicator damages trust.
02 — Approach
How it was built.
- 01Node.js WebSocket fanout layer with per-conversation rooms and presence heartbeats.
- 02MongoDB for message persistence with indexes tuned for inbox queries and pagination.
- 03Reconnect/replay logic on the client so a flaky network does not lose history.
03 — Impact
What changed afterwards.
- Delivery latency stayed low even under concurrent conversations.
- Reconnect storms (network changes, app backgrounding) no longer cause message loss.