Interview prompt
Problem context
A multi-tenant query service pools caches, workers, and accelerators. A security review shows a tenant can infer another tenant’s activity from latency, eviction, quota behavior, and detailed errors. Fully dedicated infrastructure would multiply cost. Design mitigation tiers.
Skills being evaluated
side-channel analysisresource isolationrisk-based mitigationsecurity-performance trade-offs
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