1. GraphQL intermediate

    A team debates REST and GraphQL for a new public API. What should actually decide it, and what is the operational cost each one imposes?

    2 min answer postmangraphqlrestapi-design
  2. gRPC APIs intermediate Multiple choice

    A real-time platform uses gRPC internally and REST externally. Where exactly should the boundary sit, and what belongs at the translation layer?

    2 min answer grpcapi-boundarytranslationgateway
  3. gRPC Transport intermediate

    A file-sync company moves internal service communication from JSON over HTTP to gRPC. What improves, what gets harder, and where would you keep HTTP/JSON?

    2 min answer grpcprotobufinternal-apisstreaming
  4. gRPC Transport intermediate

    A telemetry platform must choose between HTTP/JSON and gRPC for high-volume ingestion from thousands of agents. What actually decides it?

    1 min answer grafanagrpcingestionprotocols
  5. gRPC Transport intermediate

    An organisation standardises internal service communication. What actually distinguishes gRPC from JSON over HTTP at scale, and where does each break down?

    2 min answer grpcrestprotobufstreaming
  6. Guardrails intermediate

    An AI feature needs guardrails on inputs and outputs. Where should they run, and what is the latency and reliability consequence?

    2 min answer mistralguardrailssafetylatency
  7. Guardrails intermediate Multiple choice

    Your output safety classifier blocks 0.3% of responses in English and 6% in Portuguese and Turkish. Complaints arrive only from those two markets. The vendor confirms the same model version serves every region and reports no incident. Where do you look first?

    3 min answer guardrailsclassifierscalibrationlocalisation
  8. Guardrails vs Gates intermediate

    A platform has a policy check that warns when a service lacks resource limits, readiness probes or an owner label. 140 of 200 services fail at least one check. The security team asks for it to become blocking next week. What happens if you do, and what would you do instead?

    2 min answer policyenforcementmigrationexemptions
  9. Guardrails vs Gates intermediate

    A platform team must ensure services meet security and observability requirements. Should that be a gate or a guardrail?

    2 min answer hasuraguardrailsgatesdefaults
  10. Guardrails vs Gates intermediate

    Your architecture review board is a three-week queue. Half the submissions are checking things like region, encryption and tagging. Redesign the process.

    2 min answer governanceautomationreview
  11. Handling Ambiguity intermediate

    The constraint that shaped your design - order records must stay inside the country - came from a conversation with the VP who commissioned the work. She leaves in month three. What happens to the design next and what should have been in place?

    3 min answer constraintsprovenanceambiguitydata-residency
  12. Handling Ambiguity intermediate

    You must start designing and the requirements are genuinely unclear. What do you do?

    2 min answer ambiguityassumptionsprogressoptions