Thermal Engineer II

About the role Muon Space is hiring a Thermal Engineer II to own the thermal design and analysis of spacecraft assemblies and subsystems — from hand calcs and models through TVAC test support. You'll work independently within your scope and partner across mechanical, electrical, and systems teams. This position is hybrid and requires working on-site in our San Jose, CA office three days per week. Responsibilities • Build and run thermal models (Thermal Desktop or similar): TVAC margin, conduction/radiation hand calcs, and transient analyses. • Own the thermal analysis package for an assembly or subsystem end-to-end. • Size radiators and heaters and define component thermal limits and margins. • Support thermal verification and TVAC test campaigns, including data reduction. • Coordinate thermal interfaces with mechanical, electrical, and systems teams. • Mentor interns and junior engineers through model reviews. Required Qualifications • 5+ years (BS+5 / MS+3) in spacecraft or aerospace thermal engineering. • Independent user of a thermal analysis package (Thermal Desktop or equivalent). • Experience with TVAC or other spacecraft thermal testing. • Solid grasp of conduction/radiation fundamentals and hand calcs. • B.S. or higher in Mechanical, Aerospace, Physics, or a related field. Nice-to-have • Scripting in Python or Matlab. • Mechanical CAD (SolidWorks preferred). • Experience with IR-imaging systems or spacecraft payloads. Salary The salary range for this role is $144,000 - $177,000, plus a competitive equity grant and comprehensive benefits package. Final compensation will be determined based on skills, qualifications, experience, and geographic location as assessed during the interview process. About Muon Space Founded in 2021, Muon Space is an end-to-end Space Systems Provider that designs, builds, and operates LEO satellite constellations delivering mission-critical data. Our revolutionary, integrated technology stack enables customers to optimize every dimension of their missions for faster time-to-orbit and superior constellation remote sensing performance. Our state-of-the-art facility in the heart of Silicon Valley is optimized for manufacturing spacecraft and rapid, flexible payload integration at scale. From climate monitoring to national security, Muon Space is dedicated to delivering Earth Intelligence for a safer and more resilient world. Taking Care of Our Team At Muon salary is only part of our total compensation package. In addition to salary, full-time employees receive equity compensation as well as benefits including medical, dental, and vision insurance, a 401k retirement plan, short & long term disability and life insurance. We also offer three weeks paid vacation for new employees, along with 12 paid holidays, unlimited sick time and paid parental leave. Our mission embraces the entire planet and we believe our team should too. Muon is dedicated to creating a diverse and dynamic company and workforce. We believe in equal employment opportunity regardless of race, color, ancestry, religion, sex, age, national origin, citizenship, sexual orientation, marital status, disability, or gender identity. We value diversity in the workplace, and that starts with our applicants. We encourage you to apply, even if you don't check all the boxes, and we look forward to reviewing your application! In addition, if you need a reasonable accommodation as part of your application for employment or interviews with us, please let us know. ITAR/EAR Requirements This position requires access to export controlled information. To conform to U.S. Government export regulations applicable to that information, applicant must either be (A) a U.S. person, defined as a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (green card holder), (iii) refugee under 8 U.S.C. § 1157, or (iv) asylee under 8 U.S.C. § 1158, (B) eligible to access the export controlled information without a required export authorization, or (C) eligible and reasonably likely to obtain the required export authorization from the applicable U.S. government agency. The Company may, for legitimate business reasons, decline to pursue any export licensing process.