A build tools developer designs, develops, and maintains software build systems, ensuring the smooth execution of code compilations, testing, and deployment. They automate and streamline operations and processes, enhancing the efficiency and quality of software development. They manage version control systems, code merging and branching, and deal with the resolution of build failures. They also establish and maintain continuous integration and continuous deployment (CI/CD) pipelines. Moreover, build tools developers collaborate with other team members to troubleshoot build issues, provide technical guidance, and continuously improve build and release processes. They play a significant role in the software development lifecycle.