Mechanical Engineer II

Overview

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. Relativity Space is a place where autonomy, ownership, and impact exist at every level, and your work will help define the product, the process, and the culture as Terran R gains momentum.

The Stennis Test team designs, builds, and operates Relativity’s propulsion and stage test stands. Team members work hands-on with large-scale, complex systems, including fully integrated engines and stage assemblies, to push hardware toward flight readiness. The work is fast-paced and highly operational, ideal for those with backgrounds in aviation, automotive, manufacturing, offshore operations, industrial systems, construction, or adjacent industries. Collaboration between technicians, operators, and engineers is essential as we scale to prove full-stage systems and enable routine, reliable Terran R flights.

As a Mechanical Engineer II, you will design and operate rocket engine test stands for Terran R engines and stages. You will work with a team to build and modify test facilities and participate in test campaigns to flight-qualify hardware. You will be directly engaged in daily test operations, maintenance, construction, and commissioning activities in the field. The role may include both design-focused and operations-focused responsibilities.

• Design advanced propulsion test stands including 3D modeling, fluids, structural, and thermal analysis, fabrication drawings, P&IDs, component lists, and detailed work instructions
• Supervise construction, commissioning, and initial operations of facilities
• Solve a variety of technical problems across time frames, complexity, cost, and long-term impact
• Support operations and implement 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 monitor test stands and test articles via GUIs and an integrated software suite for control, automation, and data visualization
• Help develop new rocket engine propulsion designs based on test data
• Travel to production and launch locations as needed (up to 25%)

• Bachelor’s degree in mechanical engineering, aerospace engineering, or a related field
• Minimum of 2 years of engineering experience in a related field
• Demonstrated fundamentals in thermal, structural, and fluids analysis
• Strong drive to deliver on tight schedules with unconventional and creative solutions
• Hands-on fabrication experience using common power tools
• Ability to work occasional night shifts
• Valid driver’s license to operate vehicles on the test site

• Proficiency in 3D modeling and drafting, including GD&T
• Hands-on experience with metalworking, welding, hydraulics, and manufacturing
• Knowledge of fluid components such as valves, regulators, and instrumentation
• Ability to develop fluid P&IDs for large-scale test stands and ground equipment
• Experience safely operating complex fluid systems, including high-pressure gas, cryogenic fluids, flammables, and hydraulics
• Ability to work occasional night shifts

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

Actual compensation will be determined based on experience, qualifications, and other job-related factors. Compensation is one part of our total rewards package, which includes competitive salary and equity, generous PTO/sick leave, parental leave, an annual learning and development stipend, and more. To learn about benefits and perks, please visit our site.