Hermeus is a venture-backed defense aviation company reclaiming the lost art of rapid iterative prototyping to build the fastest aircraft in the world today. By prioritizing relentless hardware iteration, we deliver high-speed systems at the pace of the modern battlefield. We work with the Department of War to provide the high-speed capabilities our nation and its allies need to maintain a durable, asymmetric advantage. About The Role: In your role as a Performance Engineer, you will be responsible for analyzing, modeling, and optimizing aircraft and propulsion system performance across the full flight envelope. This position requires strong expertise in gas turbine engine cycles, aerodynamics, and thermodynamics to support aircraft development, certification, and operational excellence.