An Infiniband/IBverbs developer designs, develops, and maintains software applications and systems leveraging Infiniband technology, a high-performance network protocol used in high-throughput computing environments. The developer uses the IBverbs APIs, a library that provides direct user-level access to Infiniband hardware for managing and controlling data transfers. Tasks include optimizing data transfer speeds, ensuring reliable connectivity, and troubleshooting any issues. They also develop custom solutions for specific use-cases, ensuring network security, and documenting software for end users and other developers. They often work closely with network engineers to implement and maintain these high-performance systems.