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: Retrieves a personalized home feed for the authenticated user. The feed service aggregates posts from subreddits the user follows and recommended posts, sorted according to a specified ranking algorithm (e.g., hot, new, top). Supports pagination for infinite scroll

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