Thermal Engineer III

Firefly Aerospace • Cedar Park, Texas • Posted June 18, 2026

Position Overview

ABOUT FIREFLY AEROSPACE
As an end-to-end responsive space company, Firefly Aerospace is on a mission to enable our world to launch, land, and operate in space – anywhere, anytime. Our small- to medium-lift launch vehicles, lunar landers, and orbital vehicles allow us to service the entire lifecycle of government and commercial missions from low Earth orbit to the Moon and beyond. We utilize carbon composite structures, patented propulsion technologies, and common components across our vehicles to iterate quickly, improve reliability, and deliver payloads at a lower cost.



SUMMARY

Firefly Thermal Engineers apply world-class simulation skills and expert knowledge of heat transfer to solve complex cross-discipline problems encountered during launch vehicle and spacecraft design, development, and operations. Intense thermal radiation, aero heating, cryogenics, and vacuum culminate in a complex thermal problem with a wide array of solutions. Therm...