An AWS GPU developer leverages Amazon Web Services' GPU-powered instances to build and deploy applications that require high computational capacity, such as machine learning, graphics processing, and data analysis. They optimize software to run efficiently on GPUs, addressing complex computational challenges. They work with APIs, libraries, and drivers that interact with AWS GPU instances and handle tasks such as memory management, multi-threading, and resource allocation. They also troubleshoot performance issues, ensuring the applications are scalable, efficient, and capable of handling high-volume, real-time data. They often collaborate with other team members, like data scientists and cloud architects, to implement solutions.