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Quiz

2908 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 areas2908 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture95 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization92 AI-Era Architecture96 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

6 questions in CRDTs.

  1. CRDTs advanced

    A collaborative field-notes app uses a CRDT set per project so devices can edit offline and merge without a server decision. Two years in, projects that are heavily edited take 40 seconds to open on a mid-range phone and the local database is 900 MB. Nothing has failed. What is happening, and what would you have designed differently?

    3 min answer crdtstombstonesmetadatafigma
  2. CRDTs advanced

    A collaborative product must let several devices edit the same records, including offline. When are CRDTs the right answer, and when is server authority simpler?

    2 min answer linearcrdtsyncconflicts
  3. CRDTs advanced

    A team proposes CRDTs for a collaborative document editor. What do you check before agreeing?

    2 min answer crdtcollaborationtradeoffs
  4. CRDTs advanced

    An inspection app keeps each site's checklist in an observed-remove set CRDT and synchronises by sending the whole replica state on every reconnect. 6,000 devices on cellular, roughly 40,000 elements per site set, about eight reconnects a day. Roughly how many bytes per device-day, and what does the number rule out?

    2 min answer crdtsor-setdelta-statebandwidth
  5. CRDTs advanced

    Conflict-free replicated data types guarantee convergence without coordination. What do they cost, and when is the guarantee not enough?

    1 min answer crdtsconvergencecollaborationmetadata
  6. CRDTs beginner

    Two inspectors both work offline on the same site photo. One adds the tag "damp" and edits the caption; the other adds the tag "crack" and edits the same caption. After sync both tags are present and only one caption survived. The app uses the same CRDT library for both fields. Why did the same merge engine protect one field and silently discard the other?

    3 min answer crdtslww-registerdata-modellingoffline-first