A Chef Configuration Automation Developer automates the configuration and deployment of applications and systems using Chef, a robust automation platform. They write scripts called "recipes" and "cookbooks" in Ruby language to define how Chef manages server applications. These scripts automate processes such as installing and configuring software components, managing files, and executing other tasks to ensure systems are set up correctly and consistently. Moreover, they are responsible for maintaining these scripts, testing for any issues, and updating them as needed. They play a critical role in DevOps teams, enhancing efficiency and reducing manual errors in system configurations.