CI/CD Modernisation (Jenkins to GitHub Actions)
Migrated CI/CD pipelines from a legacy Jenkins cluster to GitHub Actions, focusing on pipeline reliability, developer experience, and reduced maintenance overhead.
Context
A technology company relied on a self-managed Jenkins cluster for CI/CD. The cluster required ongoing maintenance and was a source of friction for delivery teams.
Problem / Constraints
Jenkins required dedicated infrastructure, plugins were outdated, and pipeline definitions were inconsistent across teams. Build failures were frequent and debugging was time-consuming.
What I owned
I owned the migration strategy, reusable workflow design, and rollout coordination. I also built the Terraform module for GitHub Actions self-hosted runners on ECS.
Approach
Audited existing pipelines to categorise by complexity. Designed reusable GitHub Actions composite workflows for common patterns (build, test, deploy). Built self-hosted runners on ECS Fargate for cost control. Migrated in waves with parallel running for validation.
Architecture
Architecture diagram placeholder