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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

4 questions in Event Sourcing.

  1. Event Sourcing advanced

    A ledger service rebuilds its balance projection from the event log into a new store. The rebuilt balances differ from the live ones for about 0.3% of accounts, all of them accounts with activity during two specific weeks last year. The event log has not been modified. What went wrong, and which design decision allowed it?

    3 min answer event sourcingreplaydeterminismprojections
  2. Event Sourcing advanced

    A platform considers event sourcing for auditability. What is the permanent cost teams underestimate, and what is the cheaper alternative?

    2 min answer event-sourcingauditschema-evolutionalternatives
  3. Event Sourcing advanced

    A team proposes event sourcing for a customer preferences service. What questions do you ask?

    2 min answer event-sourcingcomplexitydecision
  4. Event Sourcing advanced

    Design the data model for recording money movement in a marketplace. What properties are non-negotiable?

    2 min answer paymentsledgerimmutabilitycorrectness