Top 50 CI/CD Pipelines Interview Questions & Answers (2026)

01 What is Continuous Integration (CI)? 02 What is the difference between Continuous Delivery and Continuous Deployment? 03 What are the key benefits of CI/CD? 04 What are the typical stages in a CI/CD pipeline? 05 What is GitHub Actions and how does it work? 06 What is Jenkins and how does it differ from GitHub Actions? 07 What is a Dockerfile and why does it matter in CI/CD? 08 What are git branching strategies for CI and how do GitFlow and trunk-based development compare? 09 How do unit tests fit into a CI pipeline? 10 What is artifact storage in CI/CD and why is it important? 11 How are environment variables and secrets managed in CI/CD pipelines? 12 What events can trigger a CI/CD pipeline? 13 What is the difference between parallel jobs and sequential jobs in a pipeline? 14 What is a build matrix in CI and when is it useful? 15 What is a pipeline cache and why should you use it? 16 What is a container registry and which ones are commonly used? 17 What is an approval gate in a CD pipeline? 18 What are common rollback strategies in CI/CD? 19 What does a basic CI pipeline look like for Node.js, Python, Java, and PHP projects? 20 What is a deployment environment (dev, staging, prod) in CI/CD?

01 What is blue-green deployment and how does it achieve zero-downtime releases? 02 What is a canary release and how does it reduce deployment risk? 03 What is a rolling deployment and how does it compare to blue-green? 04 What are feature flags and how do they integrate with CI/CD? 05 What is the testing pyramid in CI/CD and where does each test type run? 06 What are code quality gates (SonarQube, coverage thresholds) in CI/CD? 07 What is SAST (Static Application Security Testing) and how is it used in CI? 08 What is DAST (Dynamic Application Security Testing) and where does it fit in CD? 09 What is container image scanning and which tools are commonly used? 10 How does Kubernetes deployment integrate with CI/CD pipelines? 11 What is Helm and how is it used in CD pipelines? 12 What is GitOps and how does it differ from traditional push-based CD? 13 What is environment promotion and how does it work in practice? 14 What are monorepo CI strategies for handling affected changes? 15 What are DORA metrics and why do they matter for CI/CD? 16 What are self-hosted runners and when should you use them? 17 How does Terraform integrate into automated CI/CD pipelines? 18 What is multi-cloud CI/CD and what challenges does it introduce? 19 What is pipeline-as-code versus UI-configured pipelines? 20 What is dependency scanning in CI/CD and how does it work?

01 What are the core principles of GitOps? 02 What is progressive delivery and how does it extend beyond basic canary releases? 03 How is chaos engineering integrated into CD pipelines? 04 How does Terraform work in fully automated pipelines with plan PR comments and apply on merge? 05 What is compliance as code and how do tools like OPA enforce it in pipelines? 06 What is software supply chain security and what are SLSA levels, SBOMs, and image signing? 07 How do you optimize CI/CD pipeline performance at scale with distributed caching and remote build execution? 08 How do you optimize cost in CI/CD infrastructure using spot instances and right-sized runners? 09 What does a CI/CD pipeline for ML models look like (model versioning, data validation, shadow deployment)? 10 What is a security shift-left strategy in CI/CD and how is it implemented?