Netflix Infrastructure Engineer Mock Interview

Tell me about a time you designed or improved an infrastructure system for high availability at Netflix scale—what was the failure mode, what signals/metrics did you rely on, and how did you prove the change actually reduced user impact?

Netflix runs on AWS and heavily uses automation—walk me through how you would approach building an infrastructure change that is safe by default (versioning, canaries/rollouts, automated rollback, and clear ownership of blast radius).

Imagine you’re on-call and a critical dependency (DNS, service discovery, or a shared datastore) is intermittently failing across multiple services—what immediate triage steps would you take, how would you communicate with engineers/product, and how would you prevent a recurrence?

Netflix emphasizes strong engineering judgment over “one-size-fits-all”—describe a time you had to balance reliability, cost, and developer velocity when deciding between two infrastructure approaches; what trade-offs did you make and why?

A Netflix streaming pipeline requires consistent low-latency and throughput—how would you use observability (logs/metrics/traces), capacity planning, and SLOs/SLIs to diagnose a sudden performance regression and drive it to resolution?