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[System Design] Uber RAMEN: How Ride-Hailing Apps Push Real-Time Notifications to Millions of Devices

The Problem: Pushing Instant Notifications to Millions of Devices Answer-first: Uber's RAMEN system maintains persistent gRPC bidirectional streams to…

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Real-Time Notification Systems Are Harder Than Most Teams Expect

If you’ve ever thought, “It’s just a WebSocket event,” this article is for you. Notification systems look simple on the surface, but in production the…

systemdesign websockets kafka backend

WebSocket Authentication Deep Dive — Tokens, Stateful Connections, and the CORS Bypass Nobody Warns You About

WebSocket Authentication Deep Dive — Tokens, Stateful Connections, and the CORS Bypass Nobody Warns You About WebSockets are powerful. They enable rea…

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