full-stack
Real-Time Chat Application
Scalable real-time messaging app with WebSocket support, typing indicators, and message history.
ReactNode.jsSocket.ioRedisPostgreSQLDocker
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The Problem
A community platform needed real-time chat to increase user engagement, but their previous attempts had scaling issues beyond 100 concurrent users.
The Solution
Built a scalable chat system with Socket.io, Redis for pub/sub across multiple server instances, and PostgreSQL for persistent message history with efficient pagination.
Impact
Supports 5,000+ concurrent users with sub-100ms message delivery. User engagement increased by 300%.
Challenges
Handling message ordering and delivery guarantees in a distributed system. Implemented vector clocks and acknowledgment patterns.
Outcome
Chat became the platform's most-used feature, driving daily active user retention up by 45%.