Grokking the System Design Interview, Volume II
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Netflix Recommendations: API Design

Step 4: API Design

The client talks to the backend over a REST API. We define two endpoints: one that reads the home feed, and one that records a user event.

1. Get Home Feed

  • GET /v1/recommendations/home
  • Parameters: user_id (from auth token), device_type (Mobile/TV).
  • Response:
{
  "rows": [
    {
      "type": "continue_watching",
      "title": "Continue Watching for Jane",
      "items": [ { "video_id": "vid_123", "progress_sec": 450, "thumbnail": "..." } ]
    },
    {
      "type": "top_picks",
      "title": "Top Picks for You",

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