Interview prompt
Problem context
A B2B platform serves startups and regulated enterprises on shared infrastructure. A noisy tenant caused an outage, a query bug exposed cross-tenant metadata, and sales requests dedicated deployments for strategic customers. Design isolation tiers and the migration path between them.
Skills being evaluated
tenant isolationrisk tieringcell architecturesecurity economics
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