Building Real-Time Notifications at Scale
How we designed a notification system that delivers millions of real-time updates daily across web, mobile, and email with sub-second latency.
Notifications are deceptively complex. On the surface it is simple: something happens, tell the user. In practice, you deal with multiple channels, preferences, rate limiting, and deduplication.
Delivery Channels
- WebSocket — Instant in-app updates with automatic reconnection
- Push notifications — Native mobile alerts via FCM and APNs
- Email — Batched digests or instant alerts depending on preference
- SMS — Critical alerts for high-priority events
By the numbers
Our notification system processes over 2 million events daily with a p99 delivery latency of 340ms for WebSocket.
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