An HP QC (Quality Center) developer is responsible for managing, organizing, and maintaining the quality assurance process of a software development project. They use HP QC, a test management tool, to document all stages of testing, from planning to execution to reporting. Their tasks include designing test plans, writing test cases, executing tests, tracking defects, and generating reports to ensure software quality. They also handle integration with other tools for automation and continuous integration processes. The developer works closely with other team members, developers, and stakeholders to ensure the software meets quality standards and business requirements.