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2827 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 areas2827 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture100 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering93 Architecture Patterns84 Architecture Decision-Making101 The Architect's Meta-Skills92 Delivery & Release Engineering103 Platform Engineering & Developer Experience92 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

102 questions in Testing & Quality Architecture.

  1. Flaky Test Management intermediate

    Your test quarantine has grown to 140 tests over a year. What has gone wrong and how do you recover?

    2 min answer testingflakinessquarantinequality
  2. Integration Test Boundaries intermediate

    A grocery-delivery platform of the kind Instacart operates has 1,200 integration tests, all green, and an integration with the inventory service that has broken twice this quarter. The tests mock the inventory client. A developer proposes mocking less. Is that the fix?

    3 min answer integration testingmockstest boundariescontract testing
  3. Integration Test Boundaries intermediate

    A team replaces every in-process fake with the real dependency in a container, and defect escape rate falls. What have they bought and when does the bill arrive?

    2 min answer testcontainersintegration-testsci-costisolation
  4. Integration Test Boundaries intermediate

    For a service with a database, a message broker and two downstream HTTP dependencies, where do you draw the integration test boundary?

    2 min answer testingscopedesign
  5. Integration Test Boundaries advanced

    Nine teams share one integration environment where all 34 services run together. The 900-test suite takes three hours and a red run is usually somebody else's deploy rather than a defect. You have been asked to move to per-service tests with virtualised dependencies without interrupting the fortnightly release train. What is the sequence, and where can it go wrong?

    3 min answer integration-test-boundariesshared-environmentmigrationtest-doubles
  6. Integration Test Boundaries advanced

    Where should integration tests draw their boundary - at the service, at the database, or at the external dependency?

    2 min answer temporalintegration-testsboundariesfakes
  7. Integration Test Boundaries intermediate

    Where should the boundary of an integration test sit, and what is the common mistake?

    2 min answer integration-testsboundariesstubsdeterminism
  8. 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
  9. 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
  10. 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
  11. 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
  12. Non-Functional Test Strategy beginner

    A requirements document says "the system must be highly available and performant". How do you turn that into something testable?

    2 min answer nfrrequirementstesting