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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 Erasure vs Immutability.

  1. Erasure vs Immutability advanced

    A brokerage must keep an immutable audit trail and honour erasure requests. How can both be true?

    2 min answer growwerasureimmutabilitypseudonymisation
  2. Erasure vs Immutability advanced

    A marketplace of eBay's shape has an append-only event log of roughly 8 billion events over six years with personal data inline in the payloads. A new erasure obligation lands and crypto-shredding is the chosen answer, but no per-subject keys exist yet. Sequence the migration under live traffic and name the point of no return.

    3 min answer crypto-shreddingevent-sourcingenvelope-encryptionobject-lock
  3. Erasure vs Immutability advanced

    An event-sourced system keeps an immutable log. A subject requests erasure. How is this resolved?

    1 min answer erasureimmutabilityevent-sourcingcrypto-shredding
  4. Erasure vs Immutability advanced Multiple choice

    Your core system is event-sourced. A customer exercises their right to erasure. The events are immutable by design. What do you do?

    2 min answer gdprevent-sourcingdesign