GitHub Actions Interview Questions 2026

Have you worked with CI/CD pipelines, and how were they used in your project? Describe the tools used (Jenkins, GitHub Actions, GitLab CI), the stages in your pipeline, how tests were triggered, and how deployments were automated.

Describe the complete CI/CD pipeline you have implemented in your projects. Walk through every stage from code commit to production deployment, including linting, unit tests, build, artifact storage, staging deploy, integration tests, and release gates.

If a Jenkins job runs but the build does not trigger, what could be the possible reasons? Systematically diagnose: webhook misconfiguration, SCM polling, branch filter mismatch, credential errors, and agent availability.

Which Git branching strategy do you follow — GitFlow or trunk-based development — and why? Compare release cadence, merge complexity, hotfix handling, and suitability for CI/CD pipelines.

What is a webhook and how is it used in CI/CD automation? Explain how a GitHub webhook triggers a Jenkins job, the payload structure, how to secure it with a secret token, and how to debug failed webhook deliveries.

How do you prevent breaking the release branch during development? Discuss branch protection rules, required PR reviews, mandatory status checks, feature flags, and how to use a staging environment as a gate before merging to release.

How can Jenkins pipelines be created and triggered automatically? Explain pipeline-as-code with Jenkinsfile in SCM, multibranch pipelines that auto-discover branches, Organization Folders for GitHub orgs, and automatic triggering via webhooks vs SCM polling.