Engine Systems & Test Team- Combustion Device Test Engineer

Long Beach, California

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. 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.

This role is on the Component Test Team, within the Engine Systems & Test team. Our work spans simulation & software tools; system‑level architecture, requirements, and interfaces; component & integrated system hot‑fire testing; and more. We collaborate closely with component engineers, our manufacturing team, our Stennis test team, and our Cape launch team to deliver engines that will successfully propel the Terran rocket to orbit.

We strive for continuous improvement and support the development of our technical hardware and human teammates alike. This role may span several areas of our team depending on your skillset and the team’s needs at the time.

• In the test part of your role, you will serve as a Responsible Engineer for propulsion test articles.
  • You will develop test plans in collaboration with product owners, and you will execute test campaigns with our Stennis team, troubleshooting technical puzzles along the way.
  • You will own the exploratory operation of new and existing test article designs, diving deep into the evaluation of test hardware behavior in support of continuous engine development and certification.
  • This role is extremely varied day‑to‑day and, in addition to overall campaign ownership, can include writing test sequences, reviewing data, hands‑on work with test articles, writing code, sitting console for hot‑fire tests, designing tooling, and more.
• Most test roles also involve systems work – on this side of your role, you may support engine subsystem troubleshooting, partner team product investigations, engine or component analysis and simulation, trade studies, and more.
• As our vehicle development program progresses, you may have the opportunity to be involved in stage test and flight campaigns.
• You will also take ownership of projects of your creation to increase our collective efficiency.
• As a staff engineer, you should have enthusiasm for mentorship & will be expected to have high impact on the team around you.

• This role is full‑time onsite in Long Beach, CA, and requires an average of 25% travel to our test & launch sites.
  • We are open to candidates who would prefer to be located full‑time onsite at Stennis in Mississippi with 25%…