A HFSS (High Frequency Structure Simulator) developer creates and simulates high frequency electromagnetic fields to analyze the performance of electronic devices, antennas, and systems. They use the HFSS software to design, model, and visualize electromagnetic fields to predict the behavior of RF and microwave, optical, and other high-frequency components. Their work supports the development of technologies like radar, satellite, wireless communication, and electronic warfare systems. They also collaborate with engineers to refine designs, troubleshoot issues, and optimize performance based on simulation results. They must have strong problem-solving skills and a deep understanding of electromagnetics.