About the RoleApex is seeking a Senior Thermal Engineer to own the thermal design and performance of our spacecraft from concept through flight. In this role, you'll solve complex thermal challenges across the vehicle, develop and validate spacecraft level thermal models, and directly influence hardware design and mission performance. You'll work hands-on with flight hardware and partner across engineering teams to take thermal systems from early design through integration, test, launch, and on orbit operations.
Responsibilities:- Develop and maintain spacecraft-level thermal models using Ansys Thermal Desktop.
- Perform thermal analyses to evaluate spacecraft performance across mission environments.
- Develop thermal control solutions and drive thermal design decisions across spacecraft systems.
- Plan and execute thermal subsystem milestone reviews, including SRR, PDR, and CDR.
- Support thermal flight hardware integration, build, and test.
- Design, plan, and execute thermal vacuum testing at the component and spacecraft level.
- Correlate test and flight data to thermal models to improve model accuracy and performance predictions.
- Collaborate with mechanical, systems, avionics, and other engineering teams to meet spacecraft thermal requirements.
Requirements:- U.S. Person status is required as this position requires access to export-controlled data.
- Bachelor's degree in Mechanical Engineering, Aerospace Engineering, or a related field.
- 5+ years of experience in thermal engineering or analysis.
- Experience with thermal modeling and analysis tools.
- Strong understanding of heat transfer and thermal engineering fundamentals.
- Strong analytical and problem-solving skills with the ability to work in a fast-paced environment.
Preferred Qualifications:- Experience with spacecraft or aerospace thermal systems.
- Proficiency with Ansys Thermal Desktop.
- Experience designing spacecraft thermal control systems.
- Experience with thermal vacuum testing, instrumentation, and data acquisition.
- Experience correlating thermal models with test or flight data.
- Familiarity with spacecraft thermal margin standards and requirements.
- Working knowledge of two-phase thermal control systems.
- Experience with Siemens NX and Teamcenter.
Why Join Apex?Apex believes in creating a work environment that you look forward to embracing every day. Our employees love working at Apex, and we want you to love it too. We're a fast-growing startup that has raised more than $500M in funding, and we invest heavily in our people from day one.
What We Offer For Full-time Employees:- Shared upside: Receive equity in Apex, letting you benefit from the work you create
- Best-in-class healthcare: 100% company-paid medical, dental, and vision for you and your dependents, plus $100k life insurance at no cost
- Comprehensive PTO package to reset and recharge - starting at 15 days vacation, growing to 20+ days annually, plus 10 paid holidays
- Competitive 401(k) plan with generous matching - 100% match on first 3%, 50% on next 2%
- 8 weeks paid parental leave plus childcare reimbursement up to $350/day for work-related travel
- Daily catered lunch and unlimited snacks to keep you fueled throughout the day
- Vibrant community: Monthly office socials, pickleball tournaments, run club, and gatherings for you and your family
- Your dream desk setup and all the tools you need to be your most productive self
- World-class Playa Vista office with the benefit of in-person collaboration with amazing coworkers and flexibility to integrate work and life
- Real impact opportunity: Work alongside experts from aerospace, new space, and other cutting-edge industries to make a lasting difference
Ready to join a team where your contributions matter and your future is bright? Let's build something extraordinary together.
