An ITSM (Information Technology Service Management) developer designs, develops, and implements IT service management systems to streamline and automate business processes. They customize ITSM tools based on specific organizational requirements and collaborate with business analysts to understand the workflow and service needs. They also troubleshoot issues, maintain system updates, and provide technical support. Furthermore, they ensure that the ITSM systems comply with ITIL (Information Technology Infrastructure Library) best practices. Their role is crucial for improving service quality, increasing operational efficiency, and enhancing customer satisfaction in an IT-based organization.