Blue Origin

Sr Principal Thermal Engineer

Blue Origin • $205K — $287K *
Aerospace & Defense
8 - 10 years of experience
Job Overview by Ladders

Qualifications

  • Bachelor's degree in Mechanical Engineering or equivalent experience.
  • 10+ years of hands-on thermal engineering experience.
  • Proficient with thermal analysis tools (e.g., Thermal Desktop, Ansys).
  • Background in passive and active thermal control systems in demanding environments.
  • Ability to mentor junior engineers while maintaining a hands-on role.
  • Must be a U.S. citizen, permanent resident, or other lawful status.

Responsibilities

  • Own the thermal architecture of the spacecraft.
  • Design thermal systems from computing interface to radiator.
  • Lead critical trades balancing performance, mass, cost, and reliability.
  • Prototype and test novel thermal concepts quickly.
  • Model and correlate thermal performance with actual data.
  • Deliver flight hardware from concept to launch through integration and tests.

Benefits

  • Medical, dental, vision, and life insurance options.
  • Paid parental leave and short/long-term disability coverage.
  • 401(k) plan with up to 5% company match.
  • Education Support Program for continuing education.
  • Stock options for all regular employees (20+ hours/week).
  • Generous paid time off, including up to four weeks and 14 paid holidays.
Full Job Description
Application close date:
Applications will be accepted on an ongoing basis until the requisition is closed.

This role is part of Advanced Concepts and Enterprise Engineering (ACE), supporting Blue Origin's mission of millions of people living and working in space for the benefit of Earth. The team fosters innovation and drives engineering workflows of the future, shared solutions and standards, simplicity and lower costs, and manufacturable design.

Join Blue Origin as we build infrastructure in space for the benefit of Earth. We're developing a satellite constellation of orbital data centers designed to transform how compute infrastructure is deployed and leveraged.

You will own one of the most challenging subsystems on a space data center - the thermal architecture - responsible for design, analysis, testing, and flight execution of the thermal control systems for one of the highest-power spacecraft ever built. You will be expected to operate with a high degree of autonomy, leading this critical effort from the front. It's a hands-on leadership role that combines deep individual technical contribution and leading the thermal engineering team. Expect to pursue novel concepts, test them fast on the ground, and validate them in orbit.

Responsibilities include but are not limited to:
  • Own the thermal architecture: active and passive thermal control across the spacecraft.
  • Design the thermal systems from the computing interface: to the radiator
  • Lead the hard trades: performance, mass, cost, reliability, manufacturability, schedule, and operational constraints.
  • Push novel concepts: prototype rapidly, test on the ground, and validate in orbit.
  • Model and correlate: build and correlate thermal models for spacecraft, payloads, and subsystems against real test and flight data.
  • Deliver flight hardware end to end: concept through manufacturing, integration, test, qualification, and launch, improving across successive spacecraft.

Minimum Qualifications:
  • Bachelor's degree in Mechanical Engineering or a related discipline, or equivalent experience.
  • 10+ years of hands-on thermal engineering: design, analysis, hardware development, and test.
  • Strong command of thermal analysis tools such as Thermal Desktop, Ansys, or equivalent.
  • Experience with passive and active thermal control in a demanding environment: space, power, automotive, data center, food/manufacturing, or petroleum.
  • Comfortable leading and mentoring junior engineers while staying deeply hands-on.
  • Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum.

Preferred Qualifications:
  • Experience formally leading a thermal engineering team.
  • Experience with a variety of spacecraft or aircraft thermal management approaches and components: cold plates, coolant loops, pumps, heat exchangers, thermal interfaces, insulation, heaters, large lightweight deployable radiators, heat pipes, oscillating heat pipes, and vapor chambers.
  • Experience with high-power thermal systems: pumped fluid loops, large radiators, industrial heat exchangers, data center cooling, power-plant systems, automotive thermal, refrigeration, or petroleum process systems.
  • Experience rapidly leading development from architecture through qualification and production or flight.
  • Familiarity or fluency with AI tools and their application for design optimization or analysis.
  • Master's or Ph.D. in Mechanical Engineering or a related discipline with a focus on thermal sciences.


Base Pay Range for:
CO applicants is $205,695.00 - $287,971.95

Other site ranges may differ

Culture Statement

Don't meet all desired requirements? Studies have shown that some people are less likely to apply to jobs unless they meet every single desired qualification. At Blue Origin, we are dedicated to building an authentic workplace, so if you're excited about this role but your past experience doesn't align perfectly with every desired qualification in the job description, we encourage you to apply anyway. You may be just the right candidate for this or other roles.

Benefits
  • Benefits include: Medical, dental, vision, basic and supplemental life insurance, paid parental leave, short and long-term disability, 401(k) with a company match of up to 5%, and an Education Support Program.
  • Stock Options for all regular employees (working at least 20 hours/week)
  • Paid Time Off: Up to four (4) weeks per year based on weekly scheduled hours, and up to 14 company-paid holidays.
  • Dependent on role type and job level, employees may be eligible for benefits and bonuses based on the company's intent to reward individual contributions and enable them to share in the company's results, or other factors at the company's sole discretion. Bonus amounts and eligibility are not guaranteed and subject to change and cancellation. Please check with your recruiter for more details.


About Blue Origin

Blue Origin is an aerospace company that develops rockets and spacecraft for commercial and government customers. The company's products include the New Shepard suborbital vehicle and the New Glenn orbital rocket. Blue Origin was founded in 2000 by Jeff Bezos and is headquartered in Kent, Washington.
Learn more about Blue Origin
Size
3,000 employees
Industry
Founded
2000

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