Nylas transitioned from Jenkins to GitHub Actions to improve their continuous integration and delivery systems, aiming to enhance efficiency and reduce maintenance burdens. Previously, Jenkins was used to manage the continuous integration pipeline, but its limitations, including the need for extensive maintenance and incompatibility with modern cloud practices, led Nylas to seek an alternative. By switching to GitHub Actions, which integrates seamlessly with their GitHub-hosted codebase, Nylas increased developer productivity by allowing the team to create automated workflows with YAML configuration files. This move also led to a 30% reduction in test run times and a significant decrease in build failures, freeing up engineers to focus more on improving infrastructure. GitHub Actions supports various automated tasks, such as testing, code quality checks, and custom Slack and Clubhouse integrations, enhancing the overall deployment process. The transition resulted in faster, more reliable code deployments with minimal human intervention, positioning Nylas to further develop their containerization and automation strategies.