Top DevOps Engineer Interview Questions 2026

Updated 28 days ago · By SkillExchange Team

209

Open Positions

$138,071

Median Salary

18

Questions

Landing DevOps engineer jobs in 2026 means standing out in a competitive field with 209 open roles across top companies like Datapeople, CarGurus, Xero, Mountaintop, Advisor360, OpenGov, Nelly, Presto, Lead, and Topaz Labs. If you're wondering what is DevOps engineer or what does DevOps engineer do, it's all about bridging development and operations to automate deployments, manage infrastructure as code, and ensure reliable CI/CD pipelines. DevOps engineer salary reflects this demand, ranging from $36,000 for entry-level positions to $250,000 for senior roles, with a median of $138,071 USD. Remote DevOps engineer jobs are plentiful, making it easier than ever to find DevOps engineer jobs near me without relocating.

Whether you're a junior DevOps engineer eyeing entry-level DevOps engineer spots, a mid-level pro polishing your DevOps engineer resume, or aiming for senior DevOps engineer jobs with higher senior DevOps engineer salary, preparation is key. DevOps engineer vs software engineer? DevOps focuses more on infrastructure, automation, and reliability, while software engineers dive deeper into app code. These DevOps engineer interview questions cover that spectrum, from basics like how to become DevOps engineer to advanced cloud-native scenarios. Expect questions on tools like Terraform, Kubernetes, Jenkins, and AWS, plus real-world scenarios like scaling during Black Friday traffic spikes.

Building a strong DevOps engineer job description match on your resume means highlighting DevOps engineer skills like containerization, monitoring, and scripting. Junior DevOps engineer jobs might emphasize learning curves, while senior ones demand proven outage resolutions. How much does DevOps engineer make varies by experience, but acing interviews boosts your leverage. Dive into these 18 questions, balanced for all levels, to prep effectively and land that role.

beginner Questions

What is DevOps, and how does it differ from traditional IT operations?

beginner
DevOps is a cultural and technical practice that emphasizes collaboration between development and operations teams to shorten the development lifecycle and deliver high-quality software continuously. Unlike traditional IT ops, which often has siloed teams with devs throwing code 'over the wall' to ops for deployment, DevOps uses automation, CI/CD, and shared responsibility. For example, in traditional setups, a release might take weeks with manual testing; DevOps automates it to minutes via tools like Jenkins.
Tip: Keep it simple and tie it to real benefits like faster releases. Avoid jargon overload for beginner questions.

Explain the role of a docker-compose.yml file in container orchestration.

beginner
A docker-compose.yml file defines and runs multi-container Docker applications. It specifies services, networks, volumes, and configs in YAML. For instance, in a web app stack, you'd define a web service with Nginx, an app service with Node.js, and a DB service with Postgres, all linked via networks. Running docker-compose up spins it all up locally, great for dev environments.
Tip: Reference a simple example from your experience. Practice writing a basic compose file to demo if asked.

What is Infrastructure as Code (IaC), and why is it important for DevOps?

beginner
IaC is managing infrastructure through code, like Terraform or Ansible scripts, instead of manual UI clicks. It's vital because it enables version control, repeatability, testing, and quick rollbacks. In a real scenario, provisioning 100 EC2 instances manually is error-prone; with Terraform, you define it once and apply it idempotently across environments.
Tip: Mention tools like Terraform or CloudFormation. Stress benefits like auditability for compliance-heavy roles.

Describe the CI/CD pipeline and name key tools you've used.

beginner
CI/CD is Continuous Integration/Continuous Delivery/Deployment. CI builds and tests code on every commit (e.g., Jenkins, GitHub Actions). CD automates releases to staging/prod. I've used Jenkins for pipelines with stages like build, test, deploy. For example, a pipeline might run unit tests, SonarQube scans, then deploy to Kubernetes via Helm.
Tip: Draw a quick pipeline diagram on a whiteboard. Tailor to tools from the job description.

What is Git, and explain branching strategies like GitFlow.

beginner
Git is a distributed version control system. GitFlow uses branches like main (production), develop (integration), feature branches off develop, release branches for hotfixes, and hotfix branches off main. It suits teams with scheduled releases, preventing direct main commits.
Tip: Know commands like git rebase vs merge. Relate to team workflows.

How do you monitor application performance in a production environment?

beginner
Use tools like Prometheus for metrics, Grafana for dashboards, ELK stack for logs, and APM like New Relic. Set alerts for CPU >80%, error rates >5%. In practice, I integrated Prometheus with Kubernetes to track pod health and set PagerDuty alerts for incidents.
Tip: List the 'three pillars': metrics, logs, traces. Mention SLOs for a modern touch.

intermediate Questions

Walk through setting up a Jenkins pipeline for a Node.js app deployment to AWS ECS.

intermediate
In Jenkinsfile: stage 'Build' with docker build -t myapp ., push to ECR. Stage 'Test' runs npm tests. Stage 'Deploy' updates ECS task definition and service via AWS CLI: aws ecs update-service --cluster prod --service myapp --task-definition myapp:1. Use blue-green for zero-downtime.
Tip: Use a Jenkinsfile example. Discuss security like IAM roles for Jenkins.

resource "aws_instance" "web" {
  ami           = "ami-123456"
  instance_type = "t3.micro"
}
What's wrong here, and how to fix for production?

intermediate
Hardcoded AMI and no variables; lacks security groups, tags, user data. Fix with variables: variable "ami_id" {}, add security_groups, tags for cost allocation, and user_data for bootstrapping. Use modules for reusability and remote state for locking.
Tip: Spot anti-patterns like secrets in code. Suggest data sources for dynamic AMIs.

How would you implement zero-downtime deployments in Kubernetes?

intermediate
Use rolling updates with strategy: type: RollingUpdate, maxUnavailable: 0, maxSurge: 25% in Deployment spec. Add readiness/liveness probes to ensure pods are healthy before traffic shift. For canary, use Istio or Flagger with metrics-based rollouts.
Tip: Explain probes: liveness kills unhealthy, readiness stops traffic. Mention HPA for autoscaling.

Explain Ansible vs Terraform: when to use each?

intermediate
Terraform for declarative IaC to provision infra (immutable). Ansible for configuration management (idempotent, agentless via SSH). Use Terraform to create VPC/EC2, then Ansible to install software on them. Hybrid: Terraform provisions, Ansible configures via user_data.
Tip: Draw HCL/YAML snippets. Note Terraform's state management issues.

How do you secure a CI/CD pipeline against supply chain attacks?

intermediate
Sign commits/tags with GPG, use SLSA framework, scan dependencies with Dependabot/Snyk, enforce least-privilege IAM, secret scanning with Trivy. In GitHub Actions, use OIDC for AWS auth without long-lived keys. Example: workflow with permissions: contents: read.
Tip: Reference recent attacks like SolarWinds. Stress shift-left security.

Design a highly available architecture for a microservices app on AWS.

intermediate
Multi-AZ VPC with ALB across AZs, ECS/EKS in private subnets, RDS Aurora multi-AZ, ElastiCache Redis cluster, S3 for statics. Use Route53 health checks for failover. Monitoring with CloudWatch alarms to Lambda for auto-remediation.
Tip: Sketch architecture. Calculate costs and discuss trade-offs like eventual consistency.

advanced Questions

How do you handle a Kubernetes cluster etcd outage in production?

advanced
Etcd is the control plane brain; outage halts API server. First, check kubectl get componentstatuses. If single master, promote worker with kubeadm join --control-plane. For HA, ensure 3+ masters with stacked etcd. Restore from snapshot: etcdctl snapshot restore. Prevent with regular backups via Velero.
Tip: Know etcdctl commands. Discuss chaos engineering like Chaos Mesh to test resilience.

Implement GitOps with ArgoCD: explain workflow and troubleshoot a sync failure.

advanced
GitOps: desired state in Git repo, ArgoCD syncs cluster to it. Workflow: commit Helm values to Git, ArgoCD app watches repo, applies diffs. Sync fail? Check argocd app get myapp --hard-refresh for drift, logs with argocd app logs, fix manifests or ignore rules.
Tip: Demo ArgoCD UI mentally. Contrast with imperative kubectl.

Scale a service mesh like Istio for 1M RPS: optimizations?

advanced
Use Envoy sidecars with efficient WASM filters, tune pilot for fewer CRDs, enable locality load balancing, offload TLS termination. Horizontal Pod Autoscaler with custom metrics (Prometheus), circuit breakers. Benchmark with fortio, aim for <10ms p99 latency.
Tip: Know Istio components: istiod, Citadel. Discuss eBPF for future-proofing.

Scenario: Production outage from a bad deploy. Your incident response plan?

advanced
ICM: Identify (dashboards show 500s), Contain (rollback via ArgoCD), Mitigate (scale up, feature flags), Resolve (hotfix, RCA with 5 Whys). Post-mortem: blameless, action items like canary approvals. Tools: PagerDuty, Runbooks in Backstage.
Tip: Use STAR method. Emphasize SLO breach calculations.

Migrate monolith to microservices: DevOps challenges and solutions.

advanced
Challenges: distributed tracing (Jaeger), service boundaries (Domain-Driven Design), DB per service (CQRS). DevOps: Strangler pattern, blue-green, API gateway (Kong). CI/CD per service, shared platform with Backstage for self-service.
Tip: Real example from your resume. Discuss Conway's Law.

Optimize costs in a Kubernetes cluster running 24/7 workloads.

advanced
Rightsize pods with VPA, use spot instances via Karpenter, cluster autoscaler, node affinity for savings plans. Deschedule non-prod with kcronjob, Goldilocks for recommendations. Saved 40% by switching to Graviton ARM nodes. Monitor with Kubecost.
Tip: Quantify savings. Know EKS pricing nuances.

Preparation Tips

1

Tailor your DevOps engineer resume to the job description, quantifying impacts like 'Reduced deploy time 80% with Jenkins pipelines'.

2

Practice live coding IaC (Terraform) and pipelines on platforms like Katacoda or LeetCode for DevOps.

3

Build a home lab with minikube, kind, or AWS free tier to demo real setups during interviews.

4

Study company tech stack from their GitHub/LinkedIn; mention remote DevOps engineer jobs compatibility.

5

Prepare behavioral stories using STAR for senior DevOps engineer jobs, focusing on outages and wins.

Common Mistakes to Avoid

Failing to explain 'why' behind tools; interviewers want reasoning, not rote memorization.

Ignoring soft skills; DevOps is cultural, so discuss collaboration over solo heroics.

Not asking questions; inquire about their CI/CD maturity or on-call rotation.

Overlooking security; always mention secrets management and compliance in answers.

Neglecting metrics; back claims with numbers, e.g., '99.9% uptime'.

Related Skills

Cloud platforms (AWS, Azure, GCP)Containerization (Docker, Kubernetes)IaC (Terraform, Ansible)CI/CD (Jenkins, GitHub Actions, ArgoCD)Monitoring (Prometheus, Grafana, ELK)Scripting (Python, Bash, Go)Networking and SecurityGitOps and Service Mesh

Top Companies Hiring DevOps Engineer Professionals

Datapeople (4)CarGurus (4)Xero (3)Mountaintop (3)Advisor360 (2)OpenGov (2)Nelly (2)Presto (2)Lead (2)Topaz Labs (2)

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Frequently Asked Questions

What is the average DevOps engineer salary in 2026?

The median DevOps engineer salary is $138,071 USD, ranging from $36,000 for junior roles to $250,000 for senior positions, depending on location and experience.

How do I become a DevOps engineer with no experience?

Start as entry-level DevOps engineer by learning Linux, Docker, AWS certs (Solutions Architect), build GitHub projects, and apply to junior DevOps engineer jobs.

What are common DevOps engineer interview questions for seniors?

Advanced topics like GitOps, service meshes, cost optimization, incident response, and architecture design for high-scale systems.

How does DevOps engineer differ from software engineer?

DevOps engineers focus on automation, infra, CI/CD reliability; software engineers build app logic. Overlap in scripting and cloud.

Are there many remote DevOps engineer jobs available?

Yes, with 209 openings including remote DevOps engineer jobs at companies like CarGurus and Xero.

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