A GRASP Patterns developer is responsible for designing, implementing, and maintaining software systems using General Responsibility Assignment Software Patterns (GRASP). They use these patterns to solve common object-oriented design problems, enhancing software maintainability and readability. Their work involves determining how to distribute responsibilities among classes and objects, ensuring efficient software design. They also address issues like low coupling and high cohesion to ensure the system is scalable and robust. They collaborate with other developers and stakeholders, utilizing GRASP principles to create solutions that meet user needs and business objectives. Their role is crucial in providing software stability, clarity, and flexibility.