Infrastructure · Growing
DevOps Engineer: Skills, Projects & Interview Questions (2026)
Automate build, deployment and infrastructure for fast, reliable delivery.
What a DevOps Engineer actually does
Automating builds, deployments and infrastructure; running CI/CD and monitoring.
Top hiring companies: Amazon, Microsoft, Google, Atlassian, Flipkart, HashiCorp.
Top industries: Tech, Finance, E-commerce, Telecom, SaaS.
Skills you need to become a DevOps Engineer
| Skill | Importance | Learning hours | Interview weight |
|---|---|---|---|
| Linux | 10/10 | ~50h | High |
| CI/CD | 10/10 | ~50h | High |
| Docker | 10/10 | ~40h | High |
| Kubernetes | 9/10 | ~70h | High |
| Cloud (AWS/Azure/GCP) | 9/10 | ~70h | High |
| Infrastructure as Code (Terraform) | 9/10 | ~50h | High |
| Scripting (Bash/Python) | 8/10 | ~40h | High |
| Monitoring (Prometheus/Grafana) | 8/10 | ~40h | Medium |
| Git | 8/10 | ~20h | Medium |
| Configuration Mgmt (Ansible) | 7/10 | ~30h | Medium |
Core tools: Docker, Kubernetes, Terraform, Jenkins / GitHub Actions, Prometheus / Grafana, Ansible.
DevOps Engineer learning roadmap
Beginner · 3-4 months
Foundations & core tooling
Build: Containerize an app with Docker and write a basic CI pipeline.
Intermediate · 4-5 months
Applied, real-world builds
Build: Provision infra with Terraform and deploy to Kubernetes with a CD pipeline.
Advanced · 4-6 months
Production, scale & specialization
Build: Build a full GitOps platform with monitoring, autoscaling and IaC across environments.
10 DevOps Engineer portfolio projects
Dockerized App
BeginnerContainerize an app with a Dockerfile.
Skills: Docker, Linux
Basic CI Pipeline
BeginnerBuild/test pipeline with GitHub Actions.
Skills: CI/CD, Git
Kubernetes Deployment
IntermediateDeploy an app to Kubernetes.
Skills: Kubernetes, Docker
Terraform Infra
IntermediateProvision cloud infra with Terraform.
Skills: Terraform, Cloud
Full CI/CD to K8s
IntermediatePipeline building and deploying to K8s.
Skills: CI/CD, Kubernetes, Docker
Monitoring Stack
IntermediatePrometheus + Grafana monitoring.
Skills: Monitoring, Kubernetes
Secrets Management
IntermediateCentralized secrets with rotation.
Skills: Security, Cloud, CI/CD
GitOps Platform
AdvancedDeclarative deployments with ArgoCD.
Skills: CI/CD, Kubernetes, Terraform
Auto-scaling Setup
AdvancedHPA + cluster autoscaling.
Skills: Kubernetes, Cloud, Monitoring
Multi-env IaC
AdvancedTerraform across dev/stage/prod.
Skills: Terraform, Cloud, CI/CD
Common DevOps Engineer interview questions
How do you diagnose disk or network issues?Medium
What they're testing: df/du, iostat, netstat/ss, ping/traceroute
What belongs in CI vs CD?Easy
What they're testing: Integrate/test vs release/deploy
Core Kubernetes objects: pod, deployment, service.Medium
What they're testing: Unit, rollout/scaling, stable networking
Design for high availability across zones/regions.Hard
What they're testing: Redundancy, failover, replication
What is drift and how do you handle it?Medium
What they're testing: Real vs declared diverge; plan/apply/import
Prometheus + Grafana — how do they fit?Medium
What they're testing: Collect/query metrics; visualize
How do you resolve a merge conflict?Medium
What they're testing: Reconcile overlapping changes, test
Explain processes, signals and jobs.Medium
What they're testing: fg/bg, kill signals, daemons
What are the stages of a CI/CD pipeline?Easy
What they're testing: Build, test, package, deploy
How does Kubernetes do autoscaling?Medium
What they're testing: HPA on metrics; cluster autoscaler
Object vs block vs file storage.Medium
What they're testing: Use cases and access patterns
What is infrastructure as code and why use it?Easy
What they're testing: Declarative, versioned, repeatable infra
Certifications for DevOps Engineers
- Certified Kubernetes Administrator (CKA)CNCF / Linux Foundation · Very High value
- HashiCorp Certified: Terraform AssociateHashiCorp · Very High value
- AWS Certified DevOps Engineer - ProfessionalAmazon Web Services · Very High value
- Docker Certified AssociateDocker · Medium value
DevOps Engineer career path
DevOps Engineer -> Senior DevOps -> Platform/SRE Lead -> Cloud Architect
Common moves into this role / from here:
- → Site Reliability Engineer (3-5 months) — close: SLO/SLI/error budgets, distributed systems, incident management, programming depth
Related roles: Cloud Engineer, SRE, Platform Engineer
Frequently asked questions
What skills do you need to become a DevOps Engineer?
Core skills include Linux, CI/CD, Docker, Kubernetes, Cloud (AWS/Azure/GCP). Demonstrate a full CI/CD + IaC + monitoring pipeline.
What projects should a DevOps Engineer build for a portfolio?
Strong starter projects: Dockerized App; Basic CI Pipeline; Kubernetes Deployment; Terraform Infra.
How long does it take to become job-ready as a DevOps Engineer?
A focused plan runs roughly 3-4 months for fundamentals, then applied projects. Difficulty rating: 7/10.
What is the career path for a DevOps Engineer?
DevOps Engineer -> Senior DevOps -> Platform/SRE Lead -> Cloud Architect
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