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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

4 questions in Mutation Testing.

  1. Mutation Testing advanced

    A service has 8,000 unit tests running in 4 minutes, over about 60,000 lines of code. Someone proposes mutation testing in CI. Estimate the runtime, and say what that number means for where it belongs.

    3 min answer mutation testingciestimationtest quality
  2. Mutation Testing advanced

    A team adopts mutation testing to stop shipping defects in code that coverage says is tested. On a 40,000-line service with a 4-minute unit suite, what have they bought, what are they paying, and when does that bill arrive?

    3 min answer mutation-testingci-costassertion-strengthfeedback-loop
  3. Mutation Testing advanced

    A team has 85% line coverage and keeps shipping defects in tested code. What would reveal the gap?

    2 min answer digitmutation-testingcoverageassertions
  4. Mutation Testing advanced

    What does mutation testing reveal that coverage does not, and where is it worth the cost?

    2 min answer mutation-testingcoverageassertion-qualitycost