A defect management developer identifies, documents, and rectifies defects in software programs. They use bug tracking systems to record issues, prioritize them based on severity, and assign them to the relevant teams. They work closely with software developers to reproduce the defects, understand the root cause, and validate the fixes. They also coordinate with project managers to ensure defect resolution aligns with project timelines. Additionally, they contribute to enhancing the product quality by analyzing defect patterns, identifying risk areas, and suggesting improvements to the development process. They play a crucial role in ensuring software reliability and performance.