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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

6 questions in Sequence Diagrams.

  1. Sequence Diagrams intermediate

    A checkout sequence diagram has six participants and every arrow is a plain synchronous call with no timeout written on it. In production the fourth participant starts answering in 9 seconds instead of 200 ms and never returns an error. What happens second by second, what stops it, and what should the diagram have carried?

    3 min answer sequence-diagramtimeoutsdeadlinesthread-pool
  2. Sequence Diagrams intermediate

    A logistics platform's engineers cannot explain what happens when a delivery is attempted and fails. What communication artefact would help most?

    2 min answer delhiverysequence-diagramflowsexceptions
  3. Sequence Diagrams intermediate

    A multi-step order flow with compensations is described in prose and nobody agrees on the behaviour. What does a sequence diagram add, and what must it show?

    2 min answer sequence-diagramsagafailure-pathsalibaba
  4. Sequence Diagrams intermediate Multiple choice

    A settlement flow is drawn as one page with 14 lifelines and 61 messages. Three consecutive reviews have stalled on it without reaching a decision. You get one edit before the next review. Which edit makes the drawing usable?

    3 min answer sequence-diagramsreviewcomplexityownership-boundary
  5. Sequence Diagrams intermediate

    Two engineers disagree about what happens when a customer cancels an order, and both have been on the team for years. Rather than settle it in the meeting, what do you do, and what will you probably find?

    2 min answer tracingsequence diagramdocumentationdrift
  6. Sequence Diagrams intermediate

    What can a sequence diagram show that a component diagram cannot, and what is the rule for drawing one worth having?

    2 min answer sequence-diagramlatencyfailure-pathscoupling