Build a Blue-Green Deployment System Premium
Design a deployment system that can switch 100% of production traffic from the old version to the new version in under 30 seconds and roll back instantly if error rates spike.
Build a CI/CD Pipeline Orchestrator Premium
Design a system that handles 10,000 concurrent build and test jobs, assigns them to workers, streams logs in real-time, and ensures no job is lost even if a worker crashes mid-run.
Build a Multi-Region Config Management System Premium
Design a configuration management system that propagates changes to 20 global regions in under 500ms, prevents config divergence between regions, and supports instant rollback when a bad config causes elevated error rates.
Build a Shadow Traffic / Dark Launch System Premium
Design a traffic mirroring system that duplicates live production requests to a canary service in real-time, compares responses for divergence, and generates a confidence report without any user-visible impact.