Fluids GSE Design Engineer III

At Firefly, we’re focused on making space attainable for everyone – including you! Each team member’s passion, dedication, and innovative ideas have a direct impact on fueling our successful trajectory into space. With launch, lunar, and orbital vehicles, Firefly has a diverse line of business with opportunities to get hands‑on experience launching rockets, operating in space, and landing on the Moon.

Headquartered in the Lone Star State, Firefly’s hardworking team reflects Texas’ GO BIG culture in everything we do. We build big, achieve big, and dream big. We’re building launch vehicles and spacecraft to provide rapid, reliable space access. We’ve achieved some incredible wins, including the first successful commercial Moon landing. And we’re dreaming bigger than this planet with ambitions to Mars, Venus, and beyond.

Our core values are what drive us along the way.

Fireflies believe in perseverance, responsiveness, and mentoring others with a focus on inspiring a better future.

Fireflies act with integrity and take ownership of our actions, commitments, decisions, and outcomes.

Fireflies work in alignment across teams and communicate clearly with mutual respect for one another.

Fireflies deliver high‑quality work through technical rigor and timely disciplined execution for our customers.

We take care of our Fireflies with some of the best benefits in the industry. Our mission to make space for everyone starts with our employees and allowing them to make space for their family, their career, and their future.

• Unlimited PTO for exempt employees
• 3‑month sabbatical for every 5 years of service
• Medical, dental, vision, life, and disability insurance
• Mental health services
• Paid military leave

• 12 weeks paid maternity leave
• 4 weeks paid spouse leave
• $20k towards family planning: fertility, surrogacy, adoption
• Dog friendly workplace

• $10k/year towards trade school or college
• Ongoing coaching to advance leadership skills
  • Employee‑ownership with stock bonuses
  • 4% Safe Harbor 401(k) matching
  • $10k bonus for home purchase in Cedar Park, Texas

From launch technicians to propulsion engineers, Firefly has open roles across the company. We’re looking for passionate, bright innovators to join our team and help make space an achievable dream for everyone.

“You miss all the shots you don’t take. If this is something that interests you, then apply. Being a dedicated, driven team player can carry you far. You can learn about rockets, it’s much harder to learn dedication and passion.” – Meagan Roth, Sr. Director of Systems Engineering and Launch

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.

As a Fluids Ground Support Equipment (FGSE) Design Engineer, you will have the opportunity to leverage your creative background and expertise to help develop Firefly’s next generation of launch sites, test stands, and production equipment supporting Firefly’s entire fleet of launch vehicles and spacecraft. You will work in small collaborative groups, on fluid system design, installation, maintenance, and operation across our various facilities.

This work includes preliminary and detailed design, installation, startup support, system baselining, performance analysis, and recommending upgrades.

• Design ground fluid systems, including developing P&IDs, tube & pipe sizing calculations for cryogenic, multiphase, compressible & in compressible fluids, valve/fitting/component specification and selection, design for critical safety equipment, basic control philosophy for system modifications, pipe & equipment coating & insulation specification and more.
• Manage the fabrication,…