Quiz

2707 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 areas2707 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture96 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 Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk98

Difficulty Any beginner intermediate advanced

5 questions in Watermarks & Late Data.

Quiz

A daily reconciliation shows the streaming aggregation is 2% below the batch equivalent. Both read the same source. Why?

A dispatch analytics pipeline computes per-minute aggregates and the numbers keep changing after the fact. What is happening, and what decisions must be made explicit?

A streaming aggregation must produce results promptly while some events arrive minutes late. How do watermarks, windowing and allowed lateness interact, and what is the business decision underneath?

Mobile clients buffer events offline and deliver them hours later. How should watermarks and late data be handled?

Your streaming aggregate reports 2% lower daily revenue than the batch reconciliation. Both are "correct". Explain what is happening and how you resolve it.