Continuous integration is not just a DevOps practice. It is a technical safety net that catches regressions as early as possible. Here's how to get started with GitHub Actions.
Continuous integration (CI) is the practice of frequently integrating code from all team members into a main branch, with automatic verification at each integration. The goal: detect conflicts and regressions as early as possible, when they are still cheap to fix. It is the foundation of all modern software engineering.
GitHub Actions democratized CI by integrating it directly into the repository. A YAML file in .github/workflows/
triggers jobs on push, pull request or cron. A minimal pipeline for a Node.js project: checkout code, install
dependencies (npm ci), linting, unit tests, build. In fifteen minutes of configuration, you have a permanent safety
net. Matrix builds allow testing against multiple Node versions or multiple operating systems in parallel.
Jenkins, though older and more complex to operate, remains widely used in large organizations thanks to its flexibility and plugin ecosystem. Its Pipeline as Code concept (Jenkinsfile) stores the pipeline definition in the repository — a best practice to adopt regardless of the tool. Other popular alternatives: GitLab CI (excellent if you use GitLab), CircleCI, Buildkite. The choice of tool matters less than the rigor with which you maintain it.
- Start with a simple pipeline: lint + tests + build
- Store the pipeline config in the repository (as code)
- Aim for feedback in under 10 minutes
- Treat a broken pipeline as an immediate priority
→ See also: CI/CD best practices · Automated tests in CI