Propulsion Test Engineer I

Relativity Space • Stennis Space Center, MS

70d • $97,000 - $124,300

About The Position

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.

Requirements

• Bachelor's degree in mechanical engineering, aerospace engineering, or a related field.
• Hands-on fabrication experience using common power tools for projects at work/home/school.
• This role requires a valid driver's license in order to operate vehicles while on the test site.

Nice To Haves

• Drive to deliver on tight schedules, especially when unconventional & creative solutions are necessary.
• Proficiency in 3D modeling and drafting, including GD&T.
• Strong engineering fundamentals in Thermal, Structures, and Fluids.
• Hands-on experience with metalworking, welding, hydraulics, manufacturing, etc.
• Working knowledge of fluid components such as valves, regulators, and instrumentation.
• Ability to understand and develop fluid P&IDs (Plumbing and Instrumentation Diagrams) for large-scale test stands and supporting ground equipment.
• Experience safely operating complex fluid systems, including high pressure gas, cryogenic fluids, flammables, and hydraulics.
• Ability to work occasional night shifts.

Responsibilities

• Design advanced propulsion test stands including 3D modeling, fluids, structural, and thermal analysis, fabrication drawings, fluids P&IDs, component lists, and detailed work instructions.
• Supervise the construction, commissioning, and initial operations of these facilities.
• Solve a variety of technical problems, across broad ranges of timeframe, complexity, cost, and long-term impact.
• Support operations on and perform related improvements to existing test stands.
• Create, modify, and optimize test sequences, procedures, and data review processes.
• Conduct complex propulsion test operations to assess performance of rocket engines and stages.
• Directly control and receive telemetry from the test stand and test articles through GUIs and an integrated software suite for control, automation, and data visualization.
• Help develop new rocket engine propulsion designs based on real test data.

Benefits

• Competitive salary and equity.
• Generous PTO and sick leave policy.
• Parental leave.
• Annual learning and development stipend.

What This Job Offers

• Job Type: Full-time
• Career Level: Entry Level
• Education Level: Bachelor's degree
• Number of Employees: 1,001-5,000 employees