Combustion Devices - Propulsion Modelling Analyst II

Job Description

Job Description

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.

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 :

In this role you'll directly contribute to the design and qualification of the Aeon-R combustion devices hardware, from concept to detailed design and test. Your responsibilities will include building tools to improve preliminary design, performing reduced-order thermal-fluid analyses, and suggesting design changes for engine hardware ranging from injectors and thrust chambers to igniters. You will build and anchor your models to test data and work closely with designers to inform design paths and validate requirement compliance. This scope will involve single-component modeling as well as the development of in-house analysis codes from scratch. To be successful in this role, you should have a strong understanding of fundamental physics and how to apply them to new, interesting problems. You should be someone who thrives in ambiguity and be capable of leading collaborative projects to completion. You will have the opportunity to have a significant influence on major engine hardware and to make rapid professional gains in an environment that encourages growth and risk.

About you :

• Bachelor's degree in a science or engineering field
• 2+ years relevant experience in building 0D, 1D, & 2D steady state and transient fluid / thermal models
• Familiarity with numerical methods concepts such as ODEs, meshing & discretization, and optimization
• Experience with engineering scripting languages such as Python and MATLAB, as well as familiarity with code version control tools such as git
• Experience applying engineering first principles in thermodynamics, heat transfer, and fluid mechanics
• Experience communicating and explaining complex technical information to teammates and leadership

Nice to haves, but not required :

At Relativity Space, we are committed to transparency and fairness in our compensation practices. Actual compensation will be determined based on experience, qualifications, and other job-related factors.

Compensation is only one part of our total rewards package. Relativity Space offers competitive salary and equity, a generous PTO and sick leave policy, parental leave, an annual learning and development stipend, and more! To see some of the benefits & perks we offer, please visit here.

Hiring Range :

$112,000—$143,000 USD

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.