A batch script developer creates and modifies batch scripts, which are text files containing a series of commands executed by a system's command-line interpreter. These scripts automate repetitive tasks, such as file management, data manipulation, and system administration tasks. The developer designs and debugs these scripts, ensuring they perform as expected and rectify any errors. They also optimize scripts for efficiency and speed. Batch script developers often work closely with system administrators to automate system maintenance and with other developers to automate build and deployment processes. They need to understand the system's command-line interface, programming logic, and the tasks to be automated.