A Buildbot developer designs, develops, and manages an open-source framework for automating software build, test, and release processes. They create continuous integration, deployment, and delivery systems to ensure code changes are automatically built, tested, and ready for release. They create and maintain master and worker configurations, manage source code repositories, and troubleshoot build failures. They also integrate other tools for code reviews, static analysis, and code coverage reports. Additionally, they may customize Buildbot's web-based interfaces for better visualization of the build process. Their goal is to improve software quality and developer productivity.