Senior Mechanical Engineer

About the role Muon seeks a Senior Mechanical Engineer to own the mechanical direction of a spacecraft subsystem or mission from requirements definition to installation on the launch vehicle. The ideal candidate can go deep on design while carrying a "systems mindset" — a force multiplier who collaborates across disciplines to arrive at an elegant, well-balanced design. You'll start from Muon's platform building blocks, tailor and design hardware to meet mission needs, and pull in the right stakeholders (structural, thermal, electrical, systems) at the right times to deliver on time. Being an early-stage company with small teams, breadth is essential: you'll have touch points across engineering, production, and program management. As a Senior Mechanical Engineer, you'll own the design of spacecraft subsystems from concept through flight — spanning work such as payload accommodations and primary structures, deployables and solar arrays, and precision mechanisms. You'll take technical responsibility for complex assemblies, set the design approach, and drive them through analysis, build, integration, and test on fast-moving mission timelines. Beyond your own designs, you'll act as a technical anchor for the broader mechanical team — reviewing others' work, resolving the hardest trade-offs, mentoring earlier-career engineers, and partnering across disciplines (structures, thermal, avionics, propulsion, GNC) to keep the vehicle integrated and on schedule. This position is hybrid and requires working on-site in our San Jose, CA office three days per week. What you'll do * Own the end-to-end mechanical design of one or more spacecraft subsystems, from requirements and concept through CAD, flight build, and on-orbit verification. * Set the design and analysis approach for complex assemblies, making and defending key engineering trade-offs with limited oversight. * Lead design reviews and serve as a reviewer/approver for other engineers' designs and analyses. * Drive integration and test of your hardware, and troubleshoot issues through root cause during build, qualification, and mission operations. * Partner with the dedicated structural and thermal groups on detailed analysis, and coordinate across adjacent disciplines to keep the vehicle integrated. * Mentor engineers, raise the team's technical bar, and influence design standards and best practices beyond your immediate scope. Required qualifications * 8+ years of experience designing, building, and testing high-reliability hardware * B.S. or higher in Mechanical Engineering, Aerospace Engineering, or a related field * Proficiency in CAD (SolidWorks preferred) for medium-to-large assembly design and management * Mastery of drawings, GD&T, BOMs, FAIs, tolerance budgets, and mass budgets * Experience with ECO/DCO processes and PLM systems * Demonstrated proficiency leading mechanical design for complex electromechanical systems * Extensive documentation capabilities: build procedures, test plans, design trades, DOEs * Experience managing external vendors for part prototyping and development * Excellent communication, presentation, and cross-functional coordination skills Nice-to-have skills * Deep design experience in one or more of: spacecraft structures and mission integration; deployables and solar arrays; or precision mechanisms. * Experience owning a subsystem across its full lifecycle, including flight heritage or on-orbit hardware. * Fluency with first-order structural/thermal analysis and hand-offs to dedicated analysis teams. * Experience leading design reviews and defining design standards or processes. * Hands-on background in integration, test, and anomaly resolution of flight hardware. * Familiarity with solar array or electrical/power-system design (not required at this level). * Experience mentoring or technically leading a small team of engineers. Salary The salary range for this role is $173,000 - $193,000, 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. Muon is currently registered and able to hire in the following states: AL, AZ, CA, CO, CT, DC, FL, GA, IL, IA, ID, MD, MA, MI, MN, MO, NJ, NY, NC, OH, OR, PA, TN, TX, VT, VA, WA 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.