System Design & Architecture

Selected case studies and high-level architecture diagrams demonstrating scalable design choices.

Real-Time Chat — High Level Architecture

architecture diagram
  • Socket.IO cluster behind NGINX with sticky sessions for websockets.
  • Redis used for pub/sub, presence, and horizontal sync between nodes.
  • Postgres (or MongoDB) for durable message history, paginated API for clients.

Analytics Backend

Use background workers for heavy aggregations, cursor-based pagination on APIs, and caching layers with Redis.