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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

2 questions in Schema Registry.

  1. Schema Registry advanced

    A producer adds a new value, HELD_FOR_REVIEW, to the status enum of a widely consumed event. The schema registry's backward-compatibility check passes and the change deploys. Within an hour two of eleven consumers are dead-lettering every message and one is quietly booking the wrong outcome. What happened?

    3 min answer enumsschema-evolutioncompatibilityavro
  2. Schema Registry advanced

    A producer adds one optional field to an event schema and deploys. The registry accepts the new version. Within minutes, consumers that have not been redeployed start failing to deserialise every message on the topic. What was wrong with "optional"?

    3 min answer avroschema registrycompatibilitydefault values