Quiz

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 Metrics.

Quiz

A live platform's dashboards show mean latency, which stays flat during an incident where many users experience severe delays. Why do averages hide this, and what should be measured?

A multi-tenant SaaS platform cannot tell which customer caused a performance problem. What must be present in the telemetry, and what does that cost?

Etsy released StatsD in 2011: a small daemon that receives metric samples from applications over UDP, aggregates them in memory, and flushes to the metrics backend on a fixed interval. Why was UDP the right choice for that design, and what did it make permanently impossible?

Every service dashboard shows healthy metrics while users cannot complete a purchase. How is that possible and what would have detected it?