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06

Real-time Messaging App

Dating-style chat experience with WebSocket-driven messaging, presence, and persistence. Low-latency message delivery at scale.

Role
Full-stack developer
Outcome
Low-latency real-time messaging
Stack
Node.js · React · MongoDB · WebSockets
Topology
FEReactAPINode.jsDBMongoDBEXTWebSockets
Problem

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.

Approach
  • /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.
Impact
  • →Delivery latency stayed low even under concurrent conversations.
  • →Reconnect storms (network changes, app backgrounding) no longer cause message loss.