An Adobe LCDS (LiveCycle Data Services) developer primarily designs and develops enterprise-level applications and software using Adobe's LCDS platform. They create rich internet applications (RIAs) that help businesses streamline processes and improve user experience. Their responsibilities include formulating server-side logic, defining and maintaining databases, and ensuring high performance and responsiveness of the applications. They also integrate front-end elements designed by other professionals into the application. In addition, they may be required to troubleshoot and resolve any issues that arise in the system, as well as keep updated with the latest industry trends and technologies.