Senior Fluid Systems Engineer

Relativity Space • Long Beach, CA

69d • $142,000 - $181,500

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 (Mechanical Engineering or relevant)
• 5+ years of experience working with fluids systems
• Experience applying engineering fundamentals in system design, thermodynamics, fluid dynamics, and heat transfer
• Experience with one or more fluid or thermal modeling tools for internal compressible and incompressible analysis
• Experience with programming languages such as Matlab, Python, or C++

Nice To Haves

• Experience with launch vehicles and spacecraft

Responsibilities

• Conducting trade studies to produce architectures and designs that satisfy system requirements
• Sizing at the system and component level
• Conducting fluid and thermal analyses, including system performance prediction and characterization using a variety of analytical methods (1D steady-state, transient, fluid networks, etc.)
• Creating tools to enhance our team’s analysis capabilities and streamline workflow
• Participating in design and manufacturing reviews
• Owning and leading test campaigns to validate system design and performance
• Anchoring models with data from test and launch

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: Mid Level
• Education Level: Bachelor's degree
• Number of Employees: 1,001-5,000 employees