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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 Physical-World Failure Modes.

  1. Physical-World Failure Modes beginner Multiple choice

    A courier fleet of 8000 phones sends one location update every 5 seconds while on shift, 8 hours a day. Each update is about 400 bytes on the wire including headers on a reused connection. Roughly how much cellular data is that per device per month?

    3 min answer estimationtelemetrybatterybatching
  2. Physical-World Failure Modes advanced

    A logistics platform's software is correct and the operation still fails regularly. What failure modes does software architecture usually ignore?

    2 min answer physical-worldfailure-modeshuman-factorsdegradation
  3. Physical-World Failure Modes advanced

    A logistics system's software is correct and operations still fail. What class of failure is this, and how should the architecture accommodate it?

    2 min answer porterphysicalexceptionsreconciliation
  4. Physical-World Failure Modes advanced

    A regional power cut takes out 9,000 building-controller devices for six hours. Power returns and 8,700 of them reconnect within ten minutes. The other 300 never come back, and the gateway logs show TLS handshake failures with "certificate is not yet valid". The certificates do not expire for another year. What failed, and which design decision made it possible?

    3 min answer clocktlscold-startfleet