An IBM Rational ClearQuest developer is responsible for managing, tracking, and processing software defects and change requests. They work on designing, customizing, and deploying database schemas to meet specific project requirements. Their role also involves developing and implementing user interfaces, queries, and reports, as well as automating processes to enhance workflow efficiency. They also conduct regular system maintenance, troubleshoot issues, and ensure data integrity. Moreover, they often collaborate with project managers and other software professionals to ensure smooth software development processes and to align the ClearQuest system with the team's needs.