CI/CD for AWS Serverless: The Complete Guide

Why CI/CD is Critical in Serverless

In serverless, every function is an independent deployment. Without solid CI/CD, regressions slip through and rollbacks become nightmares.

1. The Ideal Pipeline

Push → Lint → Tests → Build → Deploy Staging → E2E Tests → Deploy Prod

Each step is a gate: if it fails, deployment stops.

2. GitHub Actions for Serverless

GitHub Actions is the natural choice for teams using GitHub. Configuration is simple and runners are free for public repos.

• Lint & Format: ESLint + Prettier in parallel
• Unit tests: Jest with minimum 80% coverage
• Deploy: Terraform plan on PR, Terraform apply on merge

3. Terraform in the Pipeline

The pattern that works:

• terraform plan runs on every Pull Request
• The plan is posted as a PR comment for review
• terraform apply only runs on merge to main
• State locking prevents conflicts

4. E2E Tests in Staging

After staging deployment:

• Postman/Newman tests on critical endpoints
• Integration verification (DynamoDB, SQS, etc.)
• Light load test to validate scalability

5. Automatic Rollback

If something goes wrong in production:

• CloudWatch Alarms trigger automatic rollback
• Rollback repoints to the previous version of each Lambda
• Immediate Slack notification to the team

Concrete Results

With this pipeline:

• Deployments go from 20min manual to 3min automated
• Regressions caught before production
• Rollback in under 2 minutes
• Team confidence in every deployment

Need to strengthen your CI/CD? Let's talk.