Technology · Role guide
DevOps Engineer Interview Questions & Preparation
Quick answer
A DevOps engineer interview covers CI/CD, cloud infrastructure, containers and orchestration (Docker, Kubernetes), infrastructure-as-code, and incident/reliability scenarios — plus a scripting or systems-design element. Expect to design a deployment pipeline, debug a production issue, and explain how you'd make a system reliable and observable.
Overview
DevOps interviews test whether you can build and run reliable, automated infrastructure. Employers look for strong fundamentals across CI/CD, cloud, containers and monitoring, plus calm, methodical incident handling.
The DevOps Engineer interview process
| Stage | What to expect |
|---|---|
| Recruiter screen | Background, stack and motivation. |
| Technical screen | CI/CD, cloud, containers, IaC and scripting questions. |
| Systems/reliability round | Design a pipeline or debug a production incident scenario. |
| Behavioural & team fit | On-call, collaboration with devs, and incident handling. |
DevOps Engineer interview questions
These are the questions you're most likely to be asked. Prepare a structured answer for each, and a STAR story for the behavioural ones.
- 1Design a CI/CD pipeline for a web application.
- 2How would you debug a service that's failing in production?
- 3Explain the difference between containers and virtual machines.
- 4How do you make a system observable?
- 5Walk me through a Kubernetes deployment.
- 6How do you manage infrastructure as code?
- 7Tell me about a production incident you handled.
- 8How do you approach secrets and security in a pipeline?
Example STAR answer
Example answer to: “Tell me about a production incident you handled.”
Skills assessed
How to prepare for a DevOps Engineer interview
- Be fluent across the pipeline: build, test, deploy, monitor.
- Have a clear incident story showing calm, methodical debugging.
- Explain trade-offs (e.g. reliability vs speed) out loud.
- Know your cloud provider and container tooling in depth.
Common mistakes to avoid
- Buzzwords without hands-on depth.
- No structured approach to debugging incidents.
- Ignoring observability and security.
- Weak on container orchestration fundamentals.
DevOps Engineer salary
UK DevOps engineers typically earn £50k–£85k, with senior and platform roles exceeding £100k.
Frequently asked questions
What topics come up in a DevOps interview?
CI/CD, cloud infrastructure, Docker and Kubernetes, infrastructure-as-code, monitoring/observability, and incident response — often with a scripting or design element.
How do I prepare for the incident/reliability round?
Practise a calm, structured debugging approach — check observability, isolate the change, mitigate (roll back/flag), then prevent recurrence.
Which cloud should I know?
Whichever the employer uses (AWS, GCP or Azure) — deep knowledge of one plus transferable fundamentals is ideal.
Preparing for a DevOps Engineer interview?
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