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.
Key skills to assess
Behavioural Questions
4These questions explore how the candidate has handled real situations in the past. Past behaviour is one of the strongest predictors of future performance.
Tell me about a production incident you managed. What was the root cause and how did you prevent it from happening again?
Evaluates incident response skills and post-incident improvement practices
Tell me about a time you had to convince developers to change their workflow to improve operational reliability.
Evaluates influence skills and ability to drive culture change
Describe a time you automated a manual process that was error-prone. What was the impact?
Reveals automation mindset and ability to identify high-value automation targets
Tell me about a security vulnerability you discovered in your infrastructure. How did you handle remediation?
Evaluates security awareness and incident response for infrastructure threats
Situational Questions
3Present hypothetical scenarios to understand how the candidate would approach challenges they are likely to face in the role.
Your deployment pipeline takes 45 minutes. The team wants it under 10. How do you approach this optimisation?
Assesses performance optimisation thinking and practical pipeline improvement skills
Your monitoring system fires 200 alerts overnight but only 3 are actionable. How do you fix this?
Assesses alert management maturity and signal-to-noise improvement
You inherit infrastructure with no documentation, inconsistent configurations and manual deployments. Where do you start?
Tests prioritisation in a legacy environment and incremental improvement strategy
Technical Questions
5Assess the candidate's domain expertise, tools proficiency and problem-solving ability with role-specific questions.
Describe your approach to designing a CI/CD pipeline for a team of 20 engineers working on a monorepo.
Assesses pipeline design skills and understanding of developer experience at scale
How do you decide between Terraform, Pulumi and CloudFormation for infrastructure as code? What factors influence your choice?
Tests IaC knowledge and ability to evaluate tools against requirements
Explain how you would implement a zero-downtime deployment strategy for a stateful application.
Tests understanding of deployment strategies and stateful application challenges
How do you approach secrets management across multiple environments and services?
Tests security awareness and practical secrets management knowledge
Explain the differences between containers and virtual machines. When would you choose each?
Tests foundational infrastructure knowledge and appropriate technology selection
Competency Questions
3Measure specific skills and competencies against the requirements of the role using structured, evidence-based questions.
What is your approach to disaster recovery planning? How do you test that backups actually work?
Evaluates disaster recovery knowledge and proactive testing practices
How do you balance the desire for cutting-edge tools with the stability requirements of production systems?
Assesses pragmatism and risk management in technology decisions
How do you ensure that infrastructure changes are reviewed and auditable in the same way as application code?
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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