Space is the bleeding edge for humanity's next industrial revolution. While reusable rockets have opened the door, true economic transformation requires infrastructure that makes orbit as accessible and reliable as air travel. At Lux Aeterna, we're building that future by developing the first reusable satellite platform with return capability transforming space from a one-way street into a two-way highway for innovation and commerce.
We're seeking an exceptional Thermal Design Engineer to architect and lead the development of our spacecraft’s thermal management system. As our first thermal engineer, you'll bridge the gap between analysis and hardware ownership, solving complex challenges that have profound implications for the future of commercial spaceflight. This is a unique opportunity to:
Architect design criteria to drive thermal performance of all subsystems in orbit, during reentry and on the ground.
Own the design, procurement, build, and test of all thermal control hardware on the vehicle (heaters, MLI, gap pads, radiators, thermal straps).
Perform hand calculations to iterate through ideas and problems quickly with the structures, avionics, GNC and FSW teams.
Own the vehicle thermal model in Thermal Desktop
Work directly with technical leadership to shape the future of space transportation
Support recruiting efforts to shape the engineering team as we grow
Pioneering Technology: We're developing the first reusable satellite platform with controlled return capability, fundamentally transforming space from a one-way journey to a two-way highway
Real Impact: Your work will enable new industries in space manufacturing, research, and logistics while pioneering sustainable space infrastructure
Speed & Autonomy: We maintain parallel hardware development streams and empower engineers to innovate rapidly while upholding rigorous aerospace standards
World-Class Team: Work alongside experts from leading aerospace companies and research institutions, building technology that will reshape humanity's access to space
You'll lead the thermal design, analysis, and execution of our spacecraft thermal control systems, including:
Managing technical interfaces with aerothermal teams for reentry analysis
Developing and validating thermal models for both orbital and reentry phases
Designing thermal management systems for orbital and hypersonic reentry conditions
Creating spacecraft thermal control systems for extended orbital operations
Leading selection and qualification for thermal management systems
Driving execution of development, qualification and acceptance test campaigns
Collaborating with mechanical and electrical teams on thermal design criteria
Working with vendors to develop custom thermal components and systems
BS in Mechanical Engineering or related field
8+ years of spacecraft thermal engineering experience
Proven track record designing and qualifying thermal control systems through multiple successful missions
Strong understanding of heat transfer, fluid dynamics, and thermal analysis tools
Fundamental understanding of mechanical and electrical first principles and design methodologies outside the thermal domain
Experience with Thermal Desktop
Expertise in spacecraft thermal control techniques and technologies
Demonstrated ability to excel in dynamic, high-stakes engineering environments
MS in Mechanical Engineering or related field
Direct experience with hypersonic vehicle or reentry system thermal analysis
Background in thermal protection system design and testing
Experience with aerothermal analysis tools (FIAT, CBAERO or similar)
Early-stage startup experience
We are based in Denver, CO and believe in the power of in-person collaboration. We are onsite 5 days/week by default, but flexible when life requires it.
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