FrontendDevOps/Cloud
Real User Monitoring
Also written as RUM, Frontend Monitoring, Session Replay
Measuring speed and errors from real visitors' browsers, rather than from test machines. Session replay tools record what users actually did before something broke. Datadog RUM, Sentry and LogRocket are common examples.
Think of it like
Asking every diner how their meal was, instead of only tasting it yourself in the kitchen.
Junior or senior?
Signals a frontend engineer who owns production quality, not just features.
Senior sounds like
Links it to Core Web Vitals and to fixing issues only real users hit.
Ask them
“What did real-user data show you that local testing never did?”