DevOps Engineer Interview Questions

1.1DevOps philosophy - breaking down silos, shared ownership of deployment and reliability

1.2The DevOps engineer role - what it covers, how it varies by company, and what is expected

1.3DORA metrics - deployment frequency, lead time, MTTR, and change failure rate as performance indicators

1.4DevOps maturity - assessing where an organisation is and what the next improvement looks like

2.1Continuous integration - automated builds, test runs, and the feedback loop that keeps code quality high

2.2Continuous delivery and deployment - pipeline design, environment promotion, and release strategies

2.3Pipeline as code - version-controlling pipelines, reviewing changes, and treating them like software

2.4Testing in the pipeline - unit tests, integration tests, and security scans as pipeline gates

3.1IaC principles - declarative vs imperative, idempotency, and why it matters for repeatability

3.2Terraform - resource definitions, state management, modules, and working safely with shared infrastructure

3.3GitOps - managing infrastructure through pull requests and applying the same review process as code

3.4Configuration management - tools for managing server state and keeping environments consistent

4.1Docker - images, containers, Dockerfiles, networking, and managing containerised applications

4.2Kubernetes fundamentals - pods, deployments, services, and the control plane explained

4.3Kubernetes in production - resource limits, health checks, rolling updates, and managing cluster stability

4.4Helm and Kubernetes tooling - package management, release management, and cluster governance

5.1Cloud architecture principles - regions, availability zones, fault tolerance, and designing for resilience

5.2Compute, storage, and networking on cloud platforms - the services DevOps engineers work with most

5.3Cost management - understanding cloud bills, identifying waste, and implementing cost controls

5.4Multi-cloud and hybrid cloud - the trade-offs, the complexity, and when it is worth it

6.1The three pillars of observability - logs, metrics, and traces and how they work together

6.2Monitoring strategy - what to instrument, what thresholds to alert on, and avoiding alert fatigue

6.3Alert design - actionable alerts, on-call ergonomics, and building a system that pages when it should

6.4SLIs, SLOs, and error budgets - defining reliability targets and managing the trade-off with velocity

7.1DevSecOps - shifting security left and integrating security scanning into the pipeline

7.2Secrets management - how to handle credentials, API keys, and certificates without leaking them

7.3Infrastructure security - network policies, IAM, least privilege, and hardening cloud environments

7.4Compliance as code - automating compliance checks, audit trails, and evidence collection

8.1Incident response - detection, triage, communication, resolution, and the DevOps engineer role in each

8.2Post-mortem process - blameless culture, root cause analysis, and turning incidents into improvements

8.3Chaos engineering - controlled failure injection, game days, and building confidence in resilience

8.4Runbooks and operational documentation - how to document systems so anyone can operate them under pressure

9.1Networking fundamentals - TCP/IP, DNS, HTTP, load balancing, and what DevOps engineers must understand

9.2Linux systems - process management, file systems, networking tools, and debugging on the command line

9.3Service mesh - managing service-to-service communication and observability at scale

9.4Database operations - backup, restore, failover, and the DevOps role in database reliability

10.1Technical questions - CI/CD, IaC, Kubernetes, cloud architecture, and observability

10.2System design questions - designing a deployment pipeline or reliability solution under interview conditions

10.3Scenario questions - how you handled an outage, a security incident, or a failed deployment

10.4Salary negotiation, evaluating a DevOps culture, and questions that reveal the real state of engineering operations