Interview › Resume & Behavioral
What are the riskiest assumptions in your current production environment?
Resume & Behavioral · Advanced level
Answer
The riskiest assumptions in production are usually the ones we have not tested recently: backups restore cleanly, rollback actually works, dashboards reflect user impact, autoscaling reacts fast enough, dependencies fail gracefully, and every service has a clear owner. I would not treat those as beliefs; I would turn them into validations. I identify the assumptions through incidents, architecture reviews, service readiness checks, and game days. Then I prioritize them by blast radius and likelihood and create explicit tests or controls.
Technical explanation
Untested assumptions are a major source of outages because teams discover the truth only during incidents.
Risk should be ranked by customer impact, data/security impact, likelihood, reversibility, and detection quality.
Good SRE practice turns assumptions into evidence through restore drills, failover tests, canaries, game days, and ownership reviews.
Hands-on example
1. Create a reliability-assumptions register with columns: assumption, service, owner, blast radius, last tested, evidence, and next validation date.
2. Examples: backup restore tested within 90 days, rollback under 10 minutes, dependency timeout configured, alert has runbook, dashboard maps to a user journey.
3. Run controlled tests for the highest-risk assumptions and convert failures into owned action items.
4. Review the register in monthly operational reviews so assumptions do not silently expire.
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