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2667 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 areas2667 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88
Difficulty Any beginner intermediate advanced

56 questions in Architecture Patterns.

  1. Publish/Subscribe advanced Multiple choice

    A payments service publishes PaymentCaptured to a topic with four subscribers. A fifth team needs the same event plus the payer's full name and address, which the producer does not emit because those fields are restricted. The fifth team proposes subscribing and then calling the producer per event to fetch them - about 900 extra reads a second. Which design fits?

    3 min answer pub-subtopic designauthorisationpii
  2. Publish/Subscribe advanced Multiple choice

    A social feed becomes too expensive to generate at read time. Should the system fan out on write, fan out on read, or use a hybrid - and what decides it?

    2 min answer fanoutfeedscelebrity-problemmeta
  3. Publish/Subscribe advanced

    An interviewer says - design the delivery path for a live cricket scorecard to a peak concurrent audience of the size Hotstar reported for the 2023 World Cup final, around 59 million. Walk me through the clarifying questions that change the design, then your first architecture.

    3 min answer fan-outlive eventspubsubcdn
  4. Publish/Subscribe advanced

    In a team chat product, a message posted to a channel with 8,000 members must reach everyone connected. Design the delivery path.

    2 min answer slackmessagingwebsocketsfanout
  5. Saga advanced

    A multi-party booking saga is running in production and support cannot answer where a particular booking is. What is missing from the implementation?

    2 min answer shiprocketsagaobservabilitystate
  6. Saga advanced Multiple choice

    An order flow spans several services and cannot use a distributed transaction. What decides between orchestration and choreography for the saga?

    2 min answer sagaorchestrationchoreographycompensation
  7. Saga advanced

    An order spans payment, inventory and shipping, each in its own service with its own database. How do you keep them consistent?

    3 min answer sagaconsistencycompensationoutbox
  8. Saga advanced

    Design an order saga: reserve inventory, take payment, dispatch shipment, send confirmation. What ordering problem do you see?

    2 min answer sagacompensationdesign
  9. Service Mesh advanced

    A platform is evaluating a service mesh. What should be checked before adopting, and what is the honest justification?

    2 min answer service-meshcomplexityobservabilitymtls
  10. Service Mesh advanced

    A platform runs 2000 pods across 300 services and is about to put a sidecar proxy in every pod. Roughly what does the fleet cost in memory and control-plane work before a single request is served, and which number grows fastest as the platform doubles?

    3 min answer service meshsidecarcapacitycontrol plane
  11. Service Mesh advanced

    A proposal for an internal tool serving 50 requests per second specifies a service mesh, distributed tracing, three databases, a message broker, distributed locks and multi-cluster deployment. What do you cut and what do you keep?

    3 min answer over-engineeringsimplicitymeshcritique
  12. Service Mesh advanced Multiple choice

    After a mesh rollout, one service's p99 rises from 30 ms to 70 ms, but only for calls to services in other namespaces. Same-namespace calls are unchanged. CPU on both sides is flat and the proxy reports no errors. What is the most likely cause?

    3 min answer service meshlatencylocalitycross-zone