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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

5 questions in Kappa vs Lambda.

  1. Kappa vs Lambda advanced

    A finance-reporting platform runs a nightly batch job and a streaming job that compute the same daily revenue figure, and the batch number is the one the controller signs. You are asked to retire the batch path. Sequence it so every step is reversible and say where the point of no return is.

    3 min answer lambdareconciliationauditparallel run
  2. Kappa vs Lambda advanced

    A platform maintains separate batch and streaming implementations of the same logic. What does that cost, and what are the alternatives?

    2 min answer lambdakappaduplicationskew
  3. Kappa vs Lambda advanced

    A publisher keeps every piece of published content in one ordered Kafka log and rebuilds every downstream store by replaying it, as The New York Times described in 2017. What does that buy, what does the ordering requirement cost, and where would copying it be a mistake?

    3 min answer new york timeskafkalogreplay
  4. Kappa vs Lambda advanced

    A team replays 60 days of order events through the current job to correct a tax calculation. Side effects are already handled - the replay writes to a shadow table and emits no notifications. The job enriches each order by calling the pricing service for the item's list price. What does the shadow table contain when the replay finishes?

    3 min answer replaydeterminismenrichmenttemporal-join
  5. Kappa vs Lambda advanced

    Walk me through how you would decide whether a new analytics platform needs a batch processing path at all. The team already runs a stream processor, and nobody has asked for historical reprocessing yet.

    3 min answer kappareplayretentionidempotency