A Heuristic Evaluations developer conducts usability inspections on software applications or websites, identifying potential design or functionality issues that could disrupt user experience. They apply established heuristic principles, like Nielsen's Ten Heuristics, to assess the system's interface, navigation, information architecture, and overall usability. The developer records any violations of these principles, suggesting improvements to enhance user-friendliness and efficiency. Their goal is to ensure the software or website is intuitive, easy to navigate, and provides a positive user experience. They play a critical role in the development process, often working closely with designers, developers, and user experience specialists.