Unknown Company

Fluids Engineer III

austin, tx • Posted Today

Onsite Full Time Engineering

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. And there’s no shortage of meaningful projects to work on at Firefly. 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.

The engine powering Alpha`s first stage is truly ...

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Our Values

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.

Passion

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

Accountability

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.

Space for You

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

Space for Your Family

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

Space for Your Career

$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

Job Openings

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.

Firefly Aerospace is a space and defense technology company on a mission to reliably and repeatedly launch, land, and operate space systems from Earth to the Moon and beyond. As the partner of choice for critical space missions, Firefly is the first commercial company to launch a satellite to orbit with 24-hour notice and the first company to achieve a successful Moon landing. 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

As a Fluids Ground Support Equipment (FGSE) Engineer at Firefly, you'll own the complete lifecycle of critical fluid systems at our launch sites, test stands, and production facilities. You'll work in a dynamic and collaborative environment designing and building large complex fluid systems, including incompressible, cryogenics, propellants, and high‑pressure gas systems. You’ll be solving real‑world problems in real‑time alongside skilled technicians, welders, and cross‑functional teams. From architecture trades and detailed designs through fabrication, installation, and activation, you'll be the technical decision‑maker ensuring Firefly's launch sites and test stands meet the current and future needs for each of Firefly’s programs.

This role offers exposure across Firefly's entire fleet - Alpha, Eclipse, Elytra, and Blue Ghost - giving you an unparalleled breadth of experiences and challenges as you help define the next generation of test and launch infrastructure.

RESPONSIBILITIES

Design, analyze, and build test stand and launch pad fluid systems, including incompressible, cryogenic, and high‑pressure gas systems
Own the full design cycle of your fluid systems, including generating schematics and P&IDs, sizing components, generating BOMs, creating CAD, procuring hardware, and generating drawings
Work directly with technicians and welders to schedule, prepare, and build your designs and fix real‑world problems
Participate in and lead internal design reviews, operational readiness reviews, and represent Firefly during external design reviews
Mentor early career engineers on the team and further develop engineering tools and processes
Travel to test and launch sites, as required, to support build and commissioning of new and upgraded fluid system

QUALIFICATIONS

Required

Bachelor’s degree in mechanical engineering, aerospace engineering, or equivalent
5-10 years of recent experience in a professional setting outside the classroom with fluid systems, pneumatics, hydraulics, or HVAC systems in a design, assembly, test, or operations capacity
Thorough understanding of fluid dynamics and thermodynamics
Solid understanding of fluid components such as valves, regulators, pressure transducers, tubing, tanks, pressurized hardware, seals, and instrumentation
Experience with fluid system subcomponent or pressurized component development, design, or testing (such as valves, regulators, piping systems, pumps, etc..)
Working knowledge of manufacturing, fabrication, integration & quality control relevant to fluid components (such as machining, inspection, welding, assembly, testing, etc.)
Demonstrated ability to do clean sheet designs of pressurization systems, propellant systems, or other complex multidisciplinary systems
Experience creating P&IDs, performing fluid system sizing, fluid component and instrumentation selection, and pressurized system design
Experience using fluids analysis tools such as REFPROP, GFSSP or other computer‑based fluid dynamic modeling
Proficient with 3D & 2D CAD software packages such as Siemens NX
Capable of balancing detailed design tasks with higher level project management style tasks, including budgeting, scheduling, and communications
Able to travel in support of GSE build and activation up to 30% of the time
Advanced degree in mechanical, aerospace, or equivalent field
Direct hands‑on experience building, troubleshooting, and/or operating complex fluid or mechanical systems
Cryogenic system design and/or operational experience
Hypergolic system design and/or operational experience
Experience working in an aerospace, R&D, or oil & gas environment.
Familiarity with ASME, NASA, and AFSPCMAN standards related to fluid system design, such as ASME B31.3, ASME BPVC Section VIII, and/or AFSPCMAN 91-710
Direct experience with design and build of ground systems (GSE) or related fluid systems including, but not limited to test environments, fluid or gas conditioning/storage, manufacturing processes, and compressible gases

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.

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