ABOUT FIREFLY AEROSPACE As an end-to-end space transportation company, Firefly Aerospace is on a mission to enable our world to launch, land, and operate in space � anywhere, anytime. Our launch vehicles, lunar landers, and orbital vehicles provide government and commercial customers with full mission services from low Earth orbit to the surface of the Moon and beyond. Headquartered in north Austin, Texas, Firefly is looking for passionate, hardworking innovators to join our team and help fuel our successful trajectory into space. Summary The FGSE Design Engineer will design, build, test, and support fluid systems used at Firefly�s launch sites, test stands, and production facilities. This role works closely with engineers and technicians to develop safe, reliable systems supporting launch vehicles and spacecraft. Responsibilities Design ground fluid systems for cryogenic liquids, gases, pneumatics, and other fluid applications Develop P&IDs, drawings, calculations, and work instructions Select valves, fittings, piping, tubing, and system components Support fabrication, installation, testing, and startup of fluid systems Work directly with technicians and build teams Troubleshoot and improve existing systems Develop test procedures and support system activation Participate in design and operational readiness reviews Maintain compliance with applicable engineering codes and safety standards Travel to launch and test sites as needed Required Qualifications Bachelor�s degree in Mechanical Engineering, Aerospace Engineering, or related field 5+ years of professional experience with fluid systems, pneumatics, hydraulics, HVAC, or similar systems Experience designing and building GSE or related fluid systems Strong understanding of fluids, thermodynamics, and heat transfer Experience with cryogenic systems Ability to work in a fast-paced, hands-on environment Strong communication, organization, and problem-solving skills Willingness to travel up to 30% Preferred Qualifications 7+ years of relevant experience Experience with controls, instrumentation, SCADA, DCS, or data acquisition 3D CAD experience; Siemens NX preferred Experience developing test and operating procedures Familiarity with ASME, NASA, or related fluid system standards Hands-on experience building, operating, and troubleshooting complex fluid systems Firefly offers outstanding benefits for our employees, including generous health, dental and vision plans with low plan deductibles, parental leave, educational reimbursement, short term disability, and flexible PTO options. To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State. Firefly Aerospace, Inc. is an Equal Opportunity Employer; employment with Firefly is governed based on merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.