What is Push Notification Service?

Deep dive into Push Notification Service - comprehensive guide covering architecture, scalability, and design patterns.

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How long does it take to read Push Notification Service?

Approximately 15 minutes. The guide covers requirements, high-level design, deep dives, and key trade-offs.

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Push Notification Service

Real-timeMessagingDistributed Systems

0) Problem Restatement

Design a scalable push notification service that can send notifications to millions of users across multiple platforms (iOS, Android, Web) with high throughput, low latency, and guaranteed delivery. Core challenges include handling massive fan-out (one message to millions of devices), respecting rate limits from platform providers (APNs, FCM), and ensuring reliability despite failures.

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