Astiwana contributed to the aws/aws-cdk repository by enhancing automation and governance in CI/CD workflows and improving issue tracking processes. They updated GitHub Actions and Mergify configurations to ensure new team members were properly integrated into automated approval systems, using TypeScript and YAML to manage workflow logic. Astiwana also implemented a validation check for EKS cluster names, enforcing AWS naming constraints and adding unit tests to maintain reliability. In a separate effort, they refined issue tracking by introducing alpha AWS module labels, updating configuration files to support more granular categorization. Their work demonstrated solid depth in DevOps, Infrastructure as Code, and CI/CD configuration.