Engineering

DevOps Engineer Interview Questions

DevOps engineers are the bridge between development and operations, ensuring software is deployed reliably and infrastructure scales to meet demand. They need deep technical skills across cloud platforms, automation tools and monitoring systems, combined with the collaborative mindset that DevOps culture demands. These questions assess both technical depth and operational maturity.

15 questions4 categories

Key skills to assess

CI/CD pipelinesInfrastructure as codeCloud platformsMonitoring and observabilitySecurity practicesAutomation

Behavioural Questions

4

These questions explore how the candidate has handled real situations in the past. Past behaviour is one of the strongest predictors of future performance.

1

Tell me about a production incident you managed. What was the root cause and how did you prevent it from happening again?

Behavioural

Evaluates incident response skills and post-incident improvement practices

2

Tell me about a time you had to convince developers to change their workflow to improve operational reliability.

Behavioural

Evaluates influence skills and ability to drive culture change

3

Describe a time you automated a manual process that was error-prone. What was the impact?

Behavioural

Reveals automation mindset and ability to identify high-value automation targets

4

Tell me about a security vulnerability you discovered in your infrastructure. How did you handle remediation?

Behavioural

Evaluates security awareness and incident response for infrastructure threats

Situational Questions

3

Present hypothetical scenarios to understand how the candidate would approach challenges they are likely to face in the role.

1

Your deployment pipeline takes 45 minutes. The team wants it under 10. How do you approach this optimisation?

Situational

Assesses performance optimisation thinking and practical pipeline improvement skills

2

Your monitoring system fires 200 alerts overnight but only 3 are actionable. How do you fix this?

Situational

Assesses alert management maturity and signal-to-noise improvement

3

You inherit infrastructure with no documentation, inconsistent configurations and manual deployments. Where do you start?

Situational

Tests prioritisation in a legacy environment and incremental improvement strategy

Technical Questions

5

Assess the candidate's domain expertise, tools proficiency and problem-solving ability with role-specific questions.

1

Describe your approach to designing a CI/CD pipeline for a team of 20 engineers working on a monorepo.

Technical

Assesses pipeline design skills and understanding of developer experience at scale

2

How do you decide between Terraform, Pulumi and CloudFormation for infrastructure as code? What factors influence your choice?

Technical

Tests IaC knowledge and ability to evaluate tools against requirements

3

Explain how you would implement a zero-downtime deployment strategy for a stateful application.

Technical

Tests understanding of deployment strategies and stateful application challenges

4

How do you approach secrets management across multiple environments and services?

Technical

Tests security awareness and practical secrets management knowledge

5

Explain the differences between containers and virtual machines. When would you choose each?

Technical

Tests foundational infrastructure knowledge and appropriate technology selection

Competency Questions

3

Measure specific skills and competencies against the requirements of the role using structured, evidence-based questions.

1

What is your approach to disaster recovery planning? How do you test that backups actually work?

Competency

Evaluates disaster recovery knowledge and proactive testing practices

2

How do you balance the desire for cutting-edge tools with the stability requirements of production systems?

Competency

Assesses pragmatism and risk management in technology decisions

3

How do you ensure that infrastructure changes are reviewed and auditable in the same way as application code?

Competency

Assesses governance mindset and infrastructure code review practices

Interview tips for this role

  • Include a practical exercise where candidates debug a broken deployment or design infrastructure for a given scenario. Hands-on skills are essential for this role.
  • Ask about their approach to on-call rotations and incident response. DevOps engineers who resist operational responsibility may not be the right fit.
  • Test breadth and depth. A DevOps engineer should be proficient across networking, security, automation and at least one major cloud platform.
  • Look for candidates who talk about enabling developer productivity, not just building infrastructure. The best DevOps engineers see themselves as force multipliers for the development team.

Frequently asked questions

What certifications matter for DevOps engineers?

AWS Solutions Architect, Google Cloud Professional or Azure Administrator certifications demonstrate cloud platform knowledge. Kubernetes certifications (CKA, CKAD) are valuable for container-heavy environments. However, practical experience matters more than certifications. A candidate with two years of hands-on production infrastructure experience is generally more valuable than one with multiple certifications but limited real-world exposure.

How do you assess a DevOps engineer's automation skills?

Ask them to walk through a complex automation they built, including the scripting language used, error handling approach and how they tested it. A practical exercise where they write a small automation script during the interview is even more revealing. Look for clean, maintainable code that handles edge cases.

Should DevOps engineers be embedded in development teams or centralised?

Both models work depending on organisational size and maturity. Embedded DevOps engineers provide better support to individual teams but can lead to inconsistent practices. A platform team model, where a central team provides self-service tools and standards while teams manage their own deployments, is increasingly popular and often the best of both approaches.

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