As soon as he entered the U.S., Naderi began working in NASA as a system engineer. In fact, he was an employee of the Jet Propulsion Laboratory (JPL) from the very beginning. This advanced laboratory is situated in Pasadena, California. One of the missions of the JPL is to design and launch unmanned projectiles and send them to so far distances, like outside the solar system. Firouz Naderi worked in the JPL for over 35 years. Indeed, he worked in different positions such as the system engineer, the director of technology development, project manager, the manager of astronomical physics experiments, and the manager of planetary systems.