Grokking Modern API Design Interview
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Capstone: Design a Live Notification API

The interview question is:

Design a live notification API.

The word live invites an immediate answer such as "Use WebSockets." That would skip the most important fact: the consumers are not all open screens. This design has three, and one delivery mechanism cannot fit all three.

We will use the same six-step, 45-minute framework as the earlier capstones. The REST resources remain the source of truth. SSE, platform push, and signed webhooks deliver changes to the consumer that can use each one.

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