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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 Decommissioning.

  1. Decommissioning intermediate

    A migration is complete and the old system is still running a year later. Why does decommissioning fail, and what makes it happen?

    2 min answer nykaadecommissioningcostrisk
  2. Decommissioning beginner Multiple choice

    A replaced invoicing system has had no inbound API traffic for 45 days and no user logins for 60. The team is ready to switch it off. One engineer notices that the old system still allocates the sequential invoice numbers the general ledger expects to be gapless. What must happen before shutdown?

    3 min answer decommissioningdependenciesidentifiersshutdown
  3. Decommissioning intermediate

    A replaced system is still running two years after its replacement went live. Why does decommissioning fail, and what makes it happen?

    2 min answer decommissioningunknown-consumersevidenceownership
  4. Decommissioning advanced Multiple choice

    A replaced system was made read-only for 30 days. No complaints came in and it was switched off, with its data exported to an archive. Three weeks later the annual regulatory extract fails, because the job read directly from the retired database. Which design decision made this possible?

    3 min answer decommissioningbatchregulatoryobservability