CI/CD

[see-ahy see-dee]

CI/CD is a software delivery approach that automates how code moves from a developer’s machine to production. Continuous Integration focuses on frequently merging and validating changes. Continuous Delivery or Deployment focuses on releasing those validated changes safely and quickly.

Continuous Integration (CI)

In CI, developers merge code into a shared repository often. Each change triggers automated builds and tests so issues are caught early, while fixes are still small and cheap.

Typical CI steps:

Install dependencies
Build the application
Run unit and integration tests
Run linting and type checks
Produce build artifacts

Continuous Delivery vs Continuous Deployment

Continuous Delivery

Every change is kept in a releasable state. Deploying to production may still require a manual approval.

Continuous Deployment

Every change that passes the pipeline is released to production automatically.

Why CI/CD Matters

Faster Feedback

Broken builds and failing tests surface within minutes, not days.

Higher Confidence

Automated checks reduce the risk of shipping regressions.

Smaller Releases

Frequent releases are easier to reason about and roll back.

Team Scalability

Shared pipelines encode quality standards so delivery does not depend on tribal knowledge.

Common Pipeline Stages

Source control trigger (pull request or merge)
Build and compile
Test and quality gates
Security and dependency scanning
Deploy to staging
Deploy to production
Post-deploy monitoring

Best Practices

Keep the main branch deployable
Make tests fast and reliable enough to run on every change
Fail pipelines on meaningful quality gates
Use environment parity between staging and production
Automate rollbacks or quick recovery paths
Treat pipeline config as versioned product code

Common Pitfalls

Flaky tests that erode trust in the pipeline
Manual steps that reintroduce release risk
Slow pipelines that discourage frequent commits
Missing observability after deployment

CI/CD turns release from a stressful event into a routine process. For web teams, it is foundational to shipping polished product updates with speed and confidence.