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Quiz

2707 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 areas2707 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

3 questions in Rollback & Forward Fix.

  1. Rollback & Forward Fix advanced

    A background-job system has millions of queued jobs after an incident, and replaying them all at once will crash the databases. How should recovery be sequenced?

    2 min answer backlogreplaythrottlingprioritisation
  2. Rollback & Forward Fix advanced

    A change causes a global incident. When should you roll back and when should you fix forward, and what property makes the choice easy?

    2 min answer rollbackforward-fixincidentblast-radius
  3. Rollback & Forward Fix advanced

    An order service and a billing service deploy independently. Billing shipped a version at 09:00 that requires a tax_basis field on every message. Orders shipped at 10:00 and began emitting it. At 10:40 the orders release is causing checkout errors and the on-call rolls orders back. What happens next, and what property would have made that rollback safe?

    3 min answer rollbackcontractstolerant-readerdead-letter