Interview Simulator · System Design
Design a Metrics and Alerting Pipeline
A full 45 minute round, one phase at a time. Each phase has a time budget, follow-up questions from the interviewer, and a checklist for your level. Reveal a phase's model answer whenever you need it; the report shows which phases you earned.
Design company-wide metrics and alerting for 300 teams: about 50M active time series scraped every 10 seconds, 13 months of retention, and pages that reach the right on-call within a minute. One team's cardinality explosion must never degrade another team's dashboards or alerts. Teams run about 120 Prometheus servers today.