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Quiz

2988 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2988 Architecture Fundamentals91 Distributed Systems111 Data Architecture100 Cloud Architecture97 Networking96 API & Integration Architecture97 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

5 questions in Publish/Subscribe.

  1. Publish/Subscribe advanced

    A chat platform uses publish/subscribe to deliver messages to connected clients. What breaks when a channel has a million members, and what changes?

    2 min answer pubsubfan-outscalepresence
  2. Publish/Subscribe advanced Multiple choice

    A payments service publishes PaymentCaptured to a topic with four subscribers. A fifth team needs the same event plus the payer's full name and address, which the producer does not emit because those fields are restricted. The fifth team proposes subscribing and then calling the producer per event to fetch them - about 900 extra reads a second. Which design fits?

    3 min answer pub-subtopic designauthorisationpii
  3. Publish/Subscribe advanced Multiple choice

    A social feed becomes too expensive to generate at read time. Should the system fan out on write, fan out on read, or use a hybrid - and what decides it?

    2 min answer fanoutfeedscelebrity-problemmeta
  4. Publish/Subscribe advanced

    An interviewer says - design the delivery path for a live cricket scorecard to a peak concurrent audience of the size Hotstar reported for the 2023 World Cup final, around 59 million. Walk me through the clarifying questions that change the design, then your first architecture.

    3 min answer fan-outlive eventspubsubcdn
  5. Publish/Subscribe advanced

    In a team chat product, a message posted to a channel with 8,000 members must reach everyone connected. Design the delivery path.

    2 min answer slackmessagingwebsocketsfanout