Grokking Microservices for System Design Interviews
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Case Study: A Notification System

1. The Question

"Design a notification system for a large platform: any service can request that a user be notified; delivery goes over push, email, and SMS; users control preferences. Around 100 million notifications a day."

This one is not a product. It is shared infrastructure, and nearly every system ends up needing it.

Every case study so far has been a product people use. This one is an infrastructure component, meaning a shared internal service that other services depend on. Every company builds one of these once.

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