Firefly Aerospace · 1 day ago
Propulsion Engineer IV (Fluids)
Cedar Park, TX
Full-time
Onsite
Senior Level, Lead/Staff
10+ years expFirefly Aerospace is an end-to-end space transportation company on a mission to enable world-class space operations. They are seeking a Principal Fluid Systems Engineer to lead the design, development, integration, test, and qualification of flight fluid systems, working closely with cross-functional teams.
AerospaceAir TransportationSatellite Communication
No H1B
U.S. Citizen Only
Responsibilities
Own and lead the full lifecycle development of flight fluid systems—from concept through launch and operation
Develop architectures that improve reliability, simplify manufacturing, and reduce cost and schedule risk
Define system requirements and interface definitions for propulsion, pressurization, venting, purging, fill/drain, and other fluidic subsystems
Execute detailed designs using CAD and analytical tools, and coordinate closely with thermal, structural, systems, and integration teams
Oversee qualification and acceptance test campaigns, including procedure development, test execution, and data review
Lead technical risk trades, anomaly investigations, and corrective actions across engineering and production
Mentor early-career engineers and provide technical reviews of hardware designs, analysis, and test plans
Serve as the discipline owner in program architecture discussions and influence long-term roadmap for in-space servicing and reusability
Qualification
Required
Bachelor's degree in Mechanical, Aerospace Engineering, or a related field
10+ years of experience in aerospace fluid systems or propulsion
Proven ownership of a subsystem or major fluid component through design, build, and test
Strong technical foundation in pressurized systems, cryogenics, high-pressure gas, and propellant feed design
Proficiency in CAD, P&ID creation, and familiarity with ASME Y14.5 and aerospace standards
Experience conducting system-level analysis, risk trades, and root cause investigations
Excellent communication and collaboration skills across engineering and production teams
Preferred
Advanced degree (MS or PhD) in engineering discipline
Demonstrated hands-on experience with hardware; including fluid test hardware and instrumentation
Familiarity with in-space propulsion, NASA standards, and range safety (91-710)
Experience with analytical tools such as GFSSP, Python, REFPROP, or thermal/fluid modeling
Experience working with hypergolic bi-propellants
Understanding of propulsion engine cycles and integration with fluid systems
History of developing flexible solutions with partially defined requirements and changing criteria
Ability to present technical content to internal and external review boards
Benefits
Generous health, dental and vision plans with low plan deductibles
Parental leave
Educational reimbursement
Short term disability
Flexible PTO options
Company
Firefly Aerospace
Firefly Aerospace is a space company that develops and operates launch vehicles, lunar landers, and orbital vehicles for commercial mission.
501-1000 employees
Funding
Current Stage
Public CompanyTotal Funding
$796.56MKey Investors
Northrop GrummanRPM VenturesAE Industrial Partners
2025-08-07IPO
2025-05-29Corporate Round· $50M
2024-11-12Series D· $175M
Leadership Team
Jason Kim
Chief Executive Officer
Eric Salwan
Co-Founder
Recent News
2026-01-15
2026-01-13
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