Grokking the AI System Design Interview

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System Design of Spotify-Style Music Discovery

1. The Question

"Design the discovery experience for a music streaming service: 400 million users, 100 million tracks. Personalized playlists like Discover Weekly, plus the 'radio' feature that plays endlessly from any starting song. Go."

Stop. Run it yourself, timed on the clock, before reading on.

2. Steps 1-2 (Minutes 0-8): Recognition, Scope, Success

Two serving words carry this whole case study, so nail them down first

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