System design interview question
"Design Netflix. A catalogue of professionally produced content, streamed to 250 million subscribers worldwide in the highest quality their connection supports. Assume the content already exists — focus on getting it to viewers."
The opposite of YouTube in one crucial respect — the catalogue is small, known in advance, and changes slowly. That single difference unlocks a fundamentally different strategy: you can pre-encode everything with expensive per-title optimization, and you can pre-position content inside ISP networks before anyone watches it. Candidates who design YouTube again have missed the question.
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