System design interview question
"Design the Prime Video home page. It is rows of content — 'Continue Watching', 'Top 10 in your country', 'Because you watched X', 'New Releases' — each personalized. It must render in under a second on a TV, a phone, and a browser. 200 million users."
page composition and assembly — a class of problem that appears constantly in real product work and almost never in textbook system design. The distinguishing content is: fan-out to many backend services under a strict latency budget, partial-failure tolerance, multi-layer caching with different TTLs per row, and device-specific rendering.
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