System design interview question
"Design Spotify. 100 million songs, 600 million users, instant playback, offline download, collaborative playlists, and a personalized weekly recommendation mix. Licensing means you must report every single play."
A small-file, high-catalogue streaming problem that differs from video in instructive ways — the entire catalogue is cacheable, gapless playback and instant start dominate the UX, and there is a hard business requirement (royalty reporting) that makes play-event accounting a correctness problem rather than analytics.
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