Spacecraft Thermal Engineer III

Firefly Aerospace; Town of Texas (WI); On-site; USD 100,000 - 130,000; Full time

Job summary

Firefly Aerospace is seeking a Senior Thermal Engineer to lead thermal analysis for spacecraft programs. This position requires 8-15+ years of experience in spacecraft thermal analysis and robust leadership skills.

The successful candidate will influence vehicle design decisions, mentor engineers, and develop innovative analytical methods. Candidates should hold a B.S. in Aerospace Engineering or related field, with an M.S. or Ph.D. preferred. This role is based in Town of Texas, Wisconsin.

Qualifications

• Approximately 8–15+ years of spacecraft thermal analysis experience.
• Expert knowledge of spacecraft heat transfer and thermal control systems.
• Extensive experience with Thermal Desktop and industry-standard thermal analysis software.

Responsibilities

• Lead thermal analyses that drive major vehicle design decisions across multiple spacecraft programs.
• Own the architecture, validation, and long-term maintenance of integrated spacecraft thermal models.
• Mentor and technically review work performed by thermal engineers across multiple experience levels.

Skills

Spacecraft thermal analysis

Technical leadership

Thermal Desktop

Communication skills

Education

B.S. in Aerospace Engineering, Mechanical Engineering, Physics, or related field

M.S. or Ph.D.

Tools

Thermal analysis software

Job description

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 Senior Thermal Engineers provide technical leadership for spacecraft thermal analysis across multiple vehicle programs. They develop analytical approaches for complex thermal challenges, establish modeling strategies, mentor engineers across the organization, and influence major program decisions throughout vehicle development.

This role requires deep expertise in spacecraft thermal engineering, strong technical judgment, and the ability to independently lead multidisciplinary efforts involving analysis, testing, and vehicle design.

RESPONSIBILITIES

• Lead thermal analyses that drive major vehicle design decisions across multiple spacecraft programs.
• Own the architecture, validation, and long-term maintenance of integrated spacecraft thermal models.
• Develop innovative analytical methods, workflows, and automation that improve team capability and efficiency.
• Lead thermal trade studies involving mission environments, propulsion effects, lunar surface interactions, cryogenics, and advanced thermal control technologies.
• Define thermal analysis strategies supporting conceptual design through flight.
• Organize and lead testing, including vehicle-level thermal vacuum testing.
• Serve as the point of contact for the thermal control subsystem during launch operations.
• Lead model validation efforts using thermal vacuum, qualification, acceptance, and flight data.
• Mentor and technically review work performed by thermal engineers across multiple experience levels.
• Represent Thermal Engineering during customer reviews and major program design reviews.
• Provide technical leadership during anomaly investigations and rapid-response engineering efforts.
• Influence organizational best practices, analytical standards, and long-term capability development.
• Support hiring, technical interviews, and development of the thermal engineering team.

QUALIFICATIONS

REQUIRED

• B.S. in Aerospace Engineering, Mechanical Engineering, Physics, or related field
• Approximately 8–15+ years of spacecraft thermal analysis experience
• Expert knowledge of spacecraft heat transfer and thermal control systems
• Extensive experience with Thermal Desktop and industry-standard thermal analysis software
• Demonstrated success leading thermal analyses through design, testing, and flight
• Experience with instrumentation and testing thermal hardware
• Experience correlating analytical models using environmental and flight data
• Excellent technical leadership and communication skills
• Proven ability to independently scope, execute, defend, and communicate complex analyses
• M.S. or Ph.D.
• Experience supporting NASA, DoD, or commercial spacecraft programs
• Experience developing new thermal analysis methodologies or software automation
• Familiarity with thermal standards (e.g., GSFC-STD-7001B, SMC-S-016, RCC-319, Spacecraft Payload requirements)
• Experience organizing and executing thermal vacuum tests
• Experience with advanced spacecraft thermal control technologies, lunar environments, plume heating, and mission-specific thermal phenomena