A build developer is responsible for developing and managing the software build process, which includes compiling, packaging, and versioning of software. They automate the build process to ensure swift and reliable software releases. They work closely with the development and operations teams to identify and fix build issues, and also to maintain and enhance the source code management system. They are skilled in scripting languages, and have a strong understanding of build tools like Jenkins, Maven, or Gradle. They also manage code repositories and configuration management tools, ensuring that the code is correctly merged and properly deployed in different environments.