Grokking the System Design Interview, Volume II
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Design Reddit: API Design

Step 4: API Specifications

Here are the core APIs for a Reddit-like web-scale service. Web and mobile clients call them through the API gateway with a bearer token, so every request carries the user's identity.

1. Fetch Home Feed (GET /feed)

Description: Returns the personalized home feed for the authenticated user. The feed service gathers posts from the subreddits they follow, plus recommended posts. It sorts them by the requested ranking: hot, new, or top. Pagination supports infinite scroll. Clients call this when the user opens their home page.

Endpoint: `GET /feed

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