Over a two-month period, this developer enhanced CI/CD reliability and security across several Mattermost repositories by focusing on workflow automation using YAML and GitHub Actions. In Aryakoste/mattermost, they delivered deterministic pipelines by pinning workflow dependencies to specific commit SHAs, ensuring reproducible builds and improved auditability. Their work extended to Mattermost plugin repositories, where they upgraded CI configurations to address authentication blockers and granted id-token write permissions, enabling seamless integration with external services. By systematically fixing permission issues and updating workflows, they reduced CI flakiness, increased pipeline stability, and streamlined developer velocity, demonstrating a strong command of CI/CD best practices.