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

2.1 Functional Requirements

  • Subscription management. Users choose what they follow: sources such as CNN or BBC, categories such as Politics or Sports, and entities such as "the Olympics" or a favorite artist. They can unsubscribe or change these choices at any time.

  • Content ingestion. The system collects articles from external sources continuously. It reads RSS and Atom feeds, calls publisher APIs, and crawls sites that publish no feed

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