Building a Zero-Touch CI/CD Pipeline with GitLab and Terraform for a SaaS Platform

Key Results

  • 90% Faster Releases
  • 20+ Daily Deploys
  • 100% Infrastructure as Code
  • Zero Manual Steps

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Project Background

A B2B SaaS company with 200+ enterprise clients was releasing software every two weeks using a manual, error-prone process involving hand-edited AWS console changes, SSH deployments, and a shared staging server. A single bad deployment had caused four hours of downtime, costing them two customer contracts.

The Challenge

We were engaged to design and implement a pipeline that could support the engineering team’s ambition to ship daily. The solution had to integrate with their existing GitLab repositories, enforce code review gates, support multiple environments (dev / staging / production), and roll back automatically on failure — all without disrupting current active development.

What We Delivered

  • Designed a trunk-based development workflow with protected branch policies and mandatory MR approvals
  • Built GitLab CI pipelines with parallel test stages, SAST scanning, and Docker image signing
  • Replaced all click-ops with Terraform modules covering VPC, ECS Fargate services, RDS, ElastiCache, and CloudFront
  • Implemented remote Terraform state in S3 with DynamoDB locking and per-environment workspaces
  • Configured canary deployments: 10% traffic shift validated by CloudWatch alarms before full cutover
  • Created a self-service rollback mechanism developers could trigger via a Slack command
  • Delivered internal documentation and a half-day workshop to onboard the engineering team

Technical Stack

CI/CD: GitLab CI · IaC: Terraform (AWS provider) · Compute: AWS ECS Fargate · Registry: Amazon ECR · Secrets: AWS Secrets Manager · Monitoring: CloudWatch + PagerDuty · Notifications: Slack API

Outcomes

The team went from bi-weekly releases to an average of 22 deployments per day within the first month. Mean time to recovery (MTTR) dropped from four hours to under six minutes. Every piece of infrastructure is now version-controlled and auditable, and the engineering team can onboard new cloud environments in under 15 minutes using Terraform.