Interview prompt
Problem context
A global platform distributes routing weights, kill switches, rate policies, and compliance rules to 60,000 service instances. Control-plane outages must not take down request serving, yet a stale revocation or routing change can create material risk. Design publication, local evaluation, and rollback.
Skills being evaluated
control-plane designsafe defaultsconfiguration consistencyoperability
The full reasoning guide is part of Pro
The scenario and evaluation focus above remain public. Pro unlocks the structured answer, trade-off analysis, follow-up probes, common weak answers, rubric, related reasoning, and any architecture diagram.
Sign in to continueWhat the full guide covers
Clarify the decision
Establish scale assumptions
Functional and non-functional requirements
High-level architecture
Data model and flow
Consistency and transaction boundaries
Failure modes and recovery
Security and privacy
Observability and SLOs
Capacity and cost
Alternatives and trade-offs
Evolution and migration
What Staff and Principal candidates should emphasize