
Job description
The Fluid Systems team at Firefly Aerospace is responsible for all fluid subsystems across our launch vehicles and spacecraft. As a Principal Propulsion Engineer, you’ll own the design, development, integration, test, and qualification of flight fluid systems.
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.
The ideal candidate thrives in fast-paced, hardware-rich environments, embracing new challenges with grit, creativity, and accountability. We’re looking for engineers who are excited to roll up their sleeves and help define the future of space transportation.
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Company

Manufacturing • Tech, Software & IT Services • Transportation & Logistics
Firefly Aerospace is a rapidly growing space and defense technology company providing comprehensive launch, landing, and in-space operation solutions for government and commercial clients. Specializing in rapid-response capabilities, Firefly has demonstrated unique achievements including launching a satellite with 24-hour notice and successfully landing on the Moon. Firefly’s core offerings include small-to-medium lift launch vehicles, lunar landers, and orbital vehicles, all built utilizing proven, common technologies. This approach delivers reliable, cost-effective, and efficient solutions for missions throughout cislunar space and beyond, making Firefly a key partner for organizations seeking innovative access to space.