Firefly Aerospace
Fluids Engineer III
Briggs, TX · Full-time · Posted Oct 20, 2026
- Experience
- 5–10 years of recent professional experience outside the classroom.
- Education
- Bachelor’s degree in mechanical engineering, aerospace engineering, or equivalent.
- Visa sponsorship
- Must be a U.S. citizen, lawful permanent resident, protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain required U.S. Department of State authorizations under U.S. Government space technology export regulations, including ITAR.
About the job
Designs and delivers fluid ground support systems for Firefly’s test stands, launch pads, and production facilities, from concept through installation and commissioning.
What you'll do
- Design, analyze, and build fluid systems, including cryogenic, propellant, and high-pressure gas systems; create schematics, P&IDs, component sizing, CAD, BOMs, and drawings.
- Coordinate fabrication and installation with technicians and welders, resolve build and operational issues, and support commissioning at test and launch sites.
- Lead design and readiness reviews, represent Firefly in external reviews, and mentor engineers while improving engineering tools and processes.
What they ask for
- Bachelor’s degree in mechanical engineering, aerospace engineering, or equivalent.
- 5–10 years of recent professional experience with fluid systems, pneumatics, hydraulics, or HVAC in design, assembly, test, or operations.
- Experience with fluid system design and analysis, including P&IDs, system sizing, component selection, pressurized system design, and fluids modeling tools.
- Proficient with 3D and 2D CAD software; able to travel up to 30% to support GSE build and activation.
Nice to have
- Advanced degree in mechanical or aerospace engineering, or equivalent field.
- Cryogenic or hypergolic system experience; hands-on work with complex systems, aerospace/R&D/oil & gas, or GSE; familiarity with relevant ASME, NASA, or AFSPCMAN standards.
Tools
REFPROP, GFSSP, Siemens NX, ASME B31.3, ASME BPVC Section VIII, AFSPCMAN 91-710
Model-written summary · the original posting is authoritative