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2777 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 areas2777 Architecture Fundamentals81 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-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

93 questions in Delivery & Release Engineering.

  1. Database Migration Under CD intermediate Multiple choice

    A superapp in the mould of Grab renames a column using expand and contract. The rolling deploy of the 240-pod service takes 11 minutes. A batch consumer reads a cached schema descriptor with a 1-hour TTL. A worker fleet is draining a 6-hour backlog of jobs serialised against the old shape. Mobile clients hold the old field name until users update. Roughly how long must both shapes stay correct before the contract step is safe?

    3 min answer grabexpand-and-contractschema-migrationmobile-clients
  2. Database Migration Under CD advanced

    A team deploys many times a day and must change the database schema. What discipline makes this safe?

    2 min answer migrationsexpand-contractrollbackbackfill
  3. Database Migration Under CD intermediate

    A team deploys several times a day and needs to change a database schema. What sequence prevents downtime, and which step is skipped?

    2 min answer chargebeemigrationexpand-contractbackfill
  4. Database Migration Under CD advanced Multiple choice

    You deploy at 14:00. At 14:20 error rates spike. The release included a migration that dropped a column. What do you do, and what should have been different?

    2 min answer rollbackmigrationincident
  5. Delivery & Release Engineering intermediate

    A platform's pipeline is reliable but slow, and developers batch changes to avoid it. What is the real cost, and what should be measured?

    2 min answer pipelinefeedbackbatchingmetrics
  6. Delivery & Release Engineering beginner

    Your pipeline promotes one container digest from staging to production, and the team says production therefore runs exactly what was tested. The deployment chart values, the feature-flag defaults and the migration set are each resolved fresh at deploy time. Why is the promotion claim false, and what is the smallest change that makes it true?

    3 min answer promotionrelease-unitconfigurationfeature-flags
  7. Delivery & Release Engineering intermediate Multiple choice

    Your pipeline takes 45 minutes and fails randomly twice a week. Which do you fix first and why?

    2 min answer pipelineflakinesstrustfeedback
  8. Deployment Gates intermediate

    A pipeline has accumulated a dozen approval gates and lead time has doubled. Which gates are worth keeping?

    2 min answer browserstackgateslead-timeautomation
  9. Deployment Gates intermediate

    An enterprise's deployment gates have accumulated until releases take weeks. Which gates should remain automated, which manual, and which removed?

    2 min answer gatesautomationapprovalsrisk
  10. Deployment Gates intermediate

    During an outage, an engineer wants to bypass the pipeline and patch production directly. It would save 25 minutes. What is your position?

    2 min answer incidentgovernancecontrols
  11. Deployment Gates advanced

    On 8 March 2023 a systemd security update was applied automatically across a large fraction of Datadog's virtual machines. The restart of systemd-networkd removed routes managed by the container network plugin and took roughly half the Kubernetes nodes offline across five regions. The deployment pipeline was not involved. What failed, and which design decision allowed it?

    3 min answer datadogchange-managementstaged-rolloutunattended-updates
  12. Deployment Gates advanced Multiple choice

    Your edge platform propagates configuration changes to every location within seconds. Is that a strength or a risk?

    2 min answer cloudflareconfigurationblast-radiusstaging