Grokking Modern API Design Interview

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Interview Question: Design the API Behind a Messaging App

The interview question is:

Design the API behind a messaging application.

Chapter 6 already designed the chat service.

Its contract contains:

Conversation;
Message;
Receipt;
server-assigned per-conversation message sequence;
newest-first cursor history;
POST /conversations/{conversation_id}/messages;
POST /conversations/{conversation_id}/receipts;
WebSocket delivery with opaque event ids;
a 10,000-event or 10-minute replay buffer;
409 resync_required; and
deletion tombstones that preserve message sequence.

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