This question evaluates system-design and algorithmic competencies related to personalized content selection, deduplication, constraint enforcement (editorial pins, maturity/region), data modeling, latency budgeting, caching, progressive loading, conflict resolution/backfill, and experiment-driven measurement for an initial streaming-service viewport. It is commonly asked to assess an engineer's ability to balance architectural trade-offs between server- and client-side rendering while maximizing relevance under multiple constraints; the domain is System Design and the level of abstraction spans both high-level conceptual reasoning and practical application-level design details.
You are designing the initial viewport ("above the fold") of a streaming service home page (e.g., Netflix). The first screen should show several horizontal rows of cells. Each cell displays a unique title. No duplicates are allowed within a row or across rows in the first screen.
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