About the Team: The Propulsion team at Relativity is responsible for the successful development of the engines that will power the Terran R vehicle. We own their design from concept through to launch and reuse. Our team partners heavily with manufacturing, test, launch, and integration teams, striving to develop our engines in record time and to support Terran R's first launch in 2026. As part of this team, you will help build, test, and iterate on the full product lifecycle of our Aeon-R engine systems, seeing them mature and eventually bring Terran R into space. About the Role: This role may span several areas of our team depending on your skillset and the team's needs at the time. The core responsibilities are driving engine system (architecture + CONOPS) trades, managing engine interfaces & negotiating requirements to optimize for the vehicle, and supporting engine system development overall. You may additionally support engine system analysis and simulation, engine testing, tool development, and more. In engineering at the system level, you will be expected not just to coordinate & facilitate amongst other technical teams, but to bring your own deep technical acumen to bear on problems in this highly technical role. In order to be successful in this role, you should be capable of leading collaborative projects to completion with minimal oversight. You should also be a self-starter who is always looking for ways to improve yourself & learn more about the systems that interface with yours. Along with these high expectations comes the opportunity to have a significant influence on a fast-growing startup company and to make rapid professional gains in an environment that encourages growth and risk. This role requires an average of 15% travel to our test & launch sites and may occasionally require shifted schedules or weekend work for critical milestones. About you: * Experience applying engineering fundamentals in fluid mechanics & thermodynamics * Clear evidence of ownership, problem-solving skills, and effective team collaboration from school or work experience * Demonstrated drive to deliver on ambitious schedules, even and especially if unconventional & creative solutions are necessary to do so * Bachelor's degree in a science, engineering, technology, or mathematics field * Working knowledge of liquid-propellant rocket engines * 2+ years relevant experience, preferably in a complex engineering system development and/or test environment Nice to haves, but not required: * Working knowledge of fluid components such as valves and instrumentation * Working knowledge of engine subsystems such as combustion devices and turbomachinery