Interview prompt
Problem context
A rapidly grown platform uses the same services and database for customer traffic, resource provisioning, policy changes, and health reporting. A slow provisioning query recently exhausted the database and took down the serving path. Redesign the boundary without losing consistency between declared intent and actual resources.
Skills being evaluated
plane separationconvergence designfailure isolationplatform APIs
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