A Cerner CCL (Cerner Command Language) developer primarily works on the Cerner health information system, which is used in healthcare organizations for managing patient data. Their responsibilities include creating and managing databases, writing CCL scripts to retrieve data and generate reports, troubleshooting and debugging, ensuring data security and integrity, and performing system upgrades. They also collaborate with healthcare professionals to understand their data needs and translate them into technical requirements. They play a key role in enhancing patient care by enabling efficient, accurate data management and analysis.