Quiz

2627 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 areas2627 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture77 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture85 Cost Architecture & FinOps82 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization82 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88

Difficulty Any beginner intermediate advanced

3 questions in Observability.

Quiz

Your team's on-call phone has not been paged in nine days and every dashboard is green. Why is that not yet evidence that anything is healthy, and what single mechanism turns silence into a signal?

A customer reports an error at 14:32 yesterday. What must have been built for the investigation to take two minutes rather than two hours?

A service emits one INFO log line per request and increments one counter per request. At 3,000 requests per second the two describe exactly the same traffic. Why does keeping the log cost orders of magnitude more than keeping the counter, and when is the log still the right thing to emit?