Grokking the System Design Interview, Volume II
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Step 2: Requirements

Functional Requirements

Personalized recommendations. Each user gets lists chosen for them, shown as rows such as "Top Picks for You" and "Because You Watched X". The lists come from what the user has watched and liked. Accuracy matters more here than in most products, because most viewing starts from these rows.

Discovery and novelty. The lists should also include titles the user has not tried, such as new releases, lesser-known titles, or a trending show in a genre the user rarely watches

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