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Salary
≈ $68k – $122k per year (Estimated)
Location
In office (Briggs)
Seniority
Junior · 5+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 30, 2026. First seen by Alion on Oct 28, 2026.

Overview
Company
Impact
Profile match
Firefly Aerospace is an American space and defense technology company specializing in the development of small- to medium-lift launch vehicles, lunar landers, and orbital transfer vehicles. Headquartered in Cedar Park, Texas, the company provides rapid and reliable space access through its Alpha rocket, upcoming Eclipse launch systems, Blue Ghost lunar landers, and Elytra orbital vehicles. By combining advanced in-house manufacturing, rapid iteration, and cost-effective modular technologies, it delivers end-to-end mission services supporting commercial satellite deployment, scientific lunar exploration, and national security operations across cislunar space.

ABOUT FIREFLY AEROSPACE

Firefly Aerospace is a space and defense technology company that enables our world to launch, land, and operate in space - anywhere, anytime. As the partner of choice for critical space missions, Firefly is the only commercial company to launch a satellite to orbit with 24-hour notice and the only company to achieve a successful Moon landing. Our launch vehicles, lunar landers, and orbital vehicles provide government and commercial customers with full mission services from low Earth orbit to 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

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.

This role will require travel to both our Cedar Park, TX Headquarters and our Briggs, TX Production and Development Facility.

RESPONSIBILITIES

  • Design of ground fluid systems includes developing P&IDs, tube & pipe sizing calculations for cryogenic, multiphase, compressible & incompressible 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, installation, checkout, and operation of these systems
  • Coordinate & plan fabrication/construction with GSE technician team, including but not limited to: Providing P&IDs and dimensional drawings for systems Generating drawings and work instructions Planning/scheduling upcoming work Consideration of technician feedback in the design phase Provide on-the-ground support and direction to build teams
  • Coordinate with and perform work according to policy, procedures and specifications established by the Ground Support Equipment design team
  • Maintain a high level of understanding of relevant requirements, engineering codes and piping standards including launch range requirements and ASME B31.1, ASME B31.3, ANSI, API, and applicable NFPA standards
  • Participate in and lead internal design reviews, and operations readiness reviews, as well as represent Firefly during external design reviews.
  • Perform activation testing of your systems including determining test objectives, test requirements, detailed procedure writing with a focus on safety, executing test plans and procedures, and working with other teams as necessary
  • Maintain and upgrade fluid systems as necessary, including crafting preventative maintenance plans for systems & equipment
  • Troubleshoot fluid systems for nonconformance's, using the company’s nonconformance reporting system to engineering instructions, i.e. dispositions and work steps
  • Travel to test and launch sites, as required, to support the company objectives

QUALIFICATIONS

Required

  • Bachelors’ degree in mechanical engineering, aerospace engineering, or related engineering discipline
  • Strong understanding of first-principles in fluids, heat transfer, and thermodynamics
  • Able to prioritize and execute tasks in a high pressure, fast paced environment
  • Ability to self-motivate and take the initiative to ensure your systems are functional and operating at peak performance
  • Willingness and enthusiasm to take extreme ownership over a large or complex system
  • Capable of balancing detailed design tasks with higher level project management style tasks, including budgeting, scheduling, and communications
  • Capacity to organize, communicate, and lead in a multidisciplinary environment
  • 2+ 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
  • Willingness to travel in support of GSE build and activation 30% of the time

Desired

  • Cryogenic system design and operational experience
  • Experience in an aerospace, R&D, or oil & gas environment.
  • Experience or familiarity with building or operating distributed control systems (instrumentation, data acquisition, DCS, SCADA, etc.)
  • Strong 3D CAD experience, preferably in Siemens NX/Teamcenter
  • Experience developing test and operational procedures
  • Familiarity with ASME, NASA, and SSCMAN standards related to fluid system design
  • 5+ 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
  • Hands-on experience building, troubleshooting, and operating complex fluid or mechanical systems
  • 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 gasses

Firefly offers outstanding benefits for our employees, including generous health, dental and vision plans with low plan deductibles, parental leave, relocation benefits, 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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