DevOps Engineer interview questions
A DevOps engineer interview should test hands-on infrastructure and automation skills, incident response under pressure, and how the candidate balances speed with reliability and security. Ask them to describe real outages and pipelines they have built, not just tools they have heard of.
What to assess
Behavioral questions
Tell me about a production outage you helped resolve. What was your role and what happened after?
What it reveals: Shows incident handling and learning culture.
A strong answer: Describes calm triage, communication, root cause, and a blameless postmortem with follow-up actions.
Describe a deployment pipeline you built or significantly improved.
What it reveals: Reveals CI/CD depth and impact.
A strong answer: Names the stages, tools, and measurable results like faster deploys or fewer failed releases.
Give an example of reducing cloud costs without hurting reliability.
What it reveals: Tests cost awareness and judgment.
A strong answer: Cites specific actions like rightsizing, reserved capacity, or cleanup, with dollar or percentage impact.
Tell me about a time developers resisted a process or tooling change you introduced.
What it reveals: Shows influence and empathy for developer experience.
A strong answer: Listened to concerns, adjusted the approach, and showed value through results.
Describe a time you automated a manual, error-prone operational task.
What it reveals: Tests automation mindset.
A strong answer: Explains the before and after, tools used, and how they made the automation safe.
Role-specific questions
How would you set up infrastructure as code for a new service, and how do you manage changes safely?
What it reveals: Tests IaC practices.
A strong answer: Mentions Terraform or similar, version control, code review, plan before apply, and remote state with locking.
Walk me through a zero-downtime deployment strategy.
What it reveals: Tests release engineering knowledge.
A strong answer: Explains blue-green, rolling, or canary deploys, health checks, and fast rollback.
What would you monitor for a customer-facing web API, and how do you avoid alert fatigue?
What it reveals: Tests observability and on-call maturity.
A strong answer: Focuses on latency, errors, traffic, and saturation, with alerts tied to user impact and SLOs.
How do you manage secrets like API keys and database passwords?
What it reveals: Tests security fundamentals.
A strong answer: Uses a secrets manager, least-privilege access, rotation, and never stores secrets in code.
A container keeps restarting in Kubernetes. How do you troubleshoot?
What it reveals: Tests hands-on container debugging.
A strong answer: Checks logs, events, resource limits, health probes, and recent config or image changes.
Situational questions
At 2 a.m. you get paged for high error rates, and the on-call developer is unreachable. What do you do?
What it reveals: Reveals incident judgment and escalation.
A strong answer: Assesses impact, considers rollback of the latest change, follows the escalation path, and communicates status.
A team wants production access for all developers to move faster. How do you respond?
What it reveals: Tests balancing speed and security.
A strong answer: Understands the underlying need and offers safer options like better tooling, read-only access, or just-in-time access.
Leadership asks you to migrate to a new cloud provider in one quarter. How do you plan it?
What it reveals: Shows planning and risk management.
A strong answer: Inventories dependencies, phases the migration, tests thoroughly, and flags realistic risks to the timeline.
Motivation and fit
How do you think about on-call and work-life balance for an operations team?
What it reveals: Shows sustainable team practices.
A strong answer: Values reducing pages through automation, fair rotations, and blameless culture.
What part of infrastructure work excites you most right now?
What it reveals: Assesses motivation and learning direction.
A strong answer: Gives a specific, thoughtful area and connects it to practical value.
Red flags
- Blames individuals during outage stories
- Makes manual changes in production without tracking them
- Lists many tools but cannot explain how they were used
- Treats security as someone else's job
Questions not to ask
- Do you have young children who might make overnight on-call difficult? — family status and sex discrimination risk; describe the on-call schedule and ask if they can meet it
- Do you observe a Sabbath that would conflict with weekend rotations? — religious discrimination risk; discuss accommodation only if raised after explaining the schedule
- How old are you? — age discrimination risk
- Have you ever filed a workers' compensation claim? — can violate ADA and state law protections
Interviewing for devops engineer roles?
Generate a structured kit with scoring guidance for your exact role in seconds.
Frequently asked questions
How do I test DevOps skills in an interview?
Use a practical scenario like troubleshooting a failing deployment or reviewing a short Terraform file. Pair this with incident stories to see how the candidate behaves under pressure.
What is the difference between DevOps engineer and site reliability engineer job descriptions?
The roles overlap heavily. DevOps descriptions usually emphasize CI/CD and infrastructure automation, while SRE descriptions focus more on reliability targets, SLOs, and reducing operational toil.
Should I mention on-call in a DevOps job description?
Yes. Being upfront about on-call frequency and compensation builds trust and reduces early turnover. Check your state's rules on pay for on-call time as well.