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Thermal Engineer III - Advanced Manufacturing

Hawthorne, CA

Quantum Space is redefining mobility and maneuverability in space. Our high-mobility spacecraft platforms support national security, civil, and commercial missions with unmatched flexibility and propulsion capability. We build fast and iterate quickly.

Who We’re Looking For

We are seeking a Senior Spacecraft Thermal Engineer to lead the development, implementation, and validation of thermal control solutions for our spacecraft platforms. In this high-impact role, you will own major aspects of spacecraft thermal design, analysis, and verification, working closely with a fast-moving team of engineers and scientists to shape the future of in-space systems.

This role is for an experienced technical leader who thrives in a startup-paced environment, can take broad responsibility for thermal system performance, and can mentor junior engineers while also rolling up their sleeves for hands-on integration and testing.

Where You’ll Make an Impact

  • Lead development of high-fidelity spacecraft thermal models for prediction of on-orbit performance
  • Own spacecraft-level thermal architecture, including active and passive thermal control design
  • Review, refine, and correlate as-built thermal models and vendor-supplied thermal documentation
  • Provide expert recommendations to mitigate thermal risks across spacecraft lifecycle phases
  • Collaborate closely with mechanical, electrical, and systems engineering teams to ensure spacecraft designs meet thermal requirements
  • Support thermal vacuum (TVAC) test planning, execution, correlation, and troubleshooting
  • Mentor and guide junior thermal engineers; establish best practices and processes for modeling, analysis, and documentation
  • Develop tools, workflows, and standards within the thermal ecosystem to improve efficiency and repeatability of future programs
  • Generate simplified models, thermal environments, and interface documentation for suppliers and customers
  • Review and approve component and assembly designs for thermal flight readiness
  • Produce engineering content and analyses for design reviews, test readiness reviews, and verification reports
  • Support integration, test, and launch-site operations as the subject-matter expert for spacecraft thermal performance

What It Takes

  • Bachelor's degree in Mechanical Engineering, Aerospace Engineering, or related field
  • 7+ years of relevant thermal engineering experience (spacecraft strongly preferred)
  • Advanced proficiency in Thermal Desktop, SINDA/FLUINT, or equivalent thermal analysis tools
  • Experience with spacecraft flight hardware, integration, and thermal vacuum testing
  • Familiarity with NASA, commercial, and industry standards for spacecraft design
  • Demonstrated experience correlating thermal models with test data
  • Ability to lead technical efforts and operate with a high degree of autonomy

 Nice-to-Have Experience

  • Experience with spacecraft operations, thermal limits, and anomaly resolution
  • Knowledge of thermal coatings, adhesives, multilayer insulation (MLI), and related materials
  • Exposure to electrical component thermal modeling and PCB thermal behavior
  • Experience with heat pipes, loop heat pipes, radiators, and advanced thermal hardware
  • Understanding of orbital dynamics and thermal environments across varying mission profiles
  • Prior experience in a fast-paced startup or NewSpace environment

What you'll get

  • Ownership – Lead spacecraft thermal architecture end-to-end, from modeling to flight readiness
  • Innovation – Develop advanced thermal solutions and shape next-gen modeling and test workflows
  • Impact – Ensure spacecraft survive and perform in space, directly influencing mission success
  • Growth – Expand your technical reach while mentoring engineers and collaborating across teams
  • Compensation – Competitive salary, equity, and comprehensive benefits, including medical, dental, vision, generous leave, HSA, 401(k) matching, and equity sharing

Location: Hawthorne, CA

Base Salary: $140,000 - 200,000 

The salary range for this role is an estimate based on a wide range of compensation factors. Actual salary offer may vary based on (but not limited to) work experience, education and/or training, critical skills, and/or business considerations. Highly competitive equity grants are included in the majority of full time offers; and are considered part of Quantum Space's total compensation package.

Additional Requirements

To comply with U.S. Government space technology export regulations, including ITAR, applicants must be a U.S. citizen, lawful permanent resident, protected individual per 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.

Apply now. Join us in building the next generation of spacecraft.

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