Propulsion Engineer Intern, Integrated Design - Fall

At Relativity Space, we’re building rockets to serve today’s needs and tomorrow’s breakthroughs. Our Terran R vehicle will deliver customer payloads to orbit, meeting the growing demand for launch capacity. But that’s just the start. Achieving commercial success with Terran R will unlock new opportunities to advance science, exploration, and innovation, pioneering progress that reaches beyond the known.

Joining Relativity means becoming part of something where autonomy, ownership, and impact exist at every level. Here, you're not just executing tasks; you're solving problems that haven’t been solved before, helping develop a rocket, a factory, and a business from the ground up. Whether you’re in propulsion, manufacturing, software, avionics, or a corporate function, you’ll collaborate across teams, shape decisions, and see your work come to life in record time.

Relativity is a place where creativity and technical rigor go hand in hand, and your voice will help define the stories we’re writing together. Now is a unique moment in time where it’s early enough to leave your mark on the product, the process, and the culture, but far enough along that Terran R is tangible and picking up momentum.

The most meaningful work of your career is waiting. Join us.

The Propulsion team at Relativity is focused on developing and delivering highly performant and manufacturable engines for Terran R. Engineers are responsible for the entire lifecycle of their parts, from initial design through production to qualification and flight. The team fosters a culture of bottoms-up decision-making, free from technical gatekeeping, where ownership and accountability are key at all levels. But designing engines with a quarter million pounds of thrust is just the beginning.

As the flight configuration enters qualification, the team is now exploring modifications for future engines, including thrust upgrades, new cycles, and design for mass production.

Relativity seeks a Propulsion Engineer Intern to join the Fall 2026 Internship Program. The Propulsion team at Relativity Space is responsible for the design, development, testing, and manufacturing of Relativity’s rocket engines. As a part of this team, you will help build, create, and iterate on the full product lifecycle of our Aeon‑R engines! As an integral member of the propulsion team, you will have the opportunity to

• Conceptualize, design and optimize propulsion hardware for Aeon‑R.
• Create FEA Models of your designs to build confidence they can perform in flight environments.
• Work hands on with manufacturing and integration engineers to build and integrate, while finding ways to improve your parts for DFM and DFA.
• Test your hardware on and off engine to prove its capability.

• Current undergraduate or graduate student earning your degree in a science, engineering, technology, or mathematics field
• Strong engineering fundamentals in either fluid mechanics & thermodynamics, or structural design & analysis (not required to be proficient in all areas)
• Clear evidence of ownership, problem‑solving skills, and effective team collaboration from school or work experience
• Excitement & ability to learn quickly

• Experience applying engineering fundamentals in thermodynamics, thermal, structural, and/or fluids to solve real-world problems.
• Hands‑on experience manufacturing, integrating, or testing hardware.
• Working knowledge of liquid‑propellant rocket engines
• Experience with design and analysis software