Senior Spacecraft Thermal Engineer

From telescopes to software architecture, Observable Space provides the foundational elements every organization needs to operate in space. Observable Space is unlocking continuous, real-time observations of space with the industry's first line of vertically integrated hardware and software products. The company is a leader in advanced telescope design and manufacturing in the US. Every product is part of a robust developer platform for space data applications. Observable Space's full line of products serves all sectors of the space industry including commercial, science, education, and government customers, as well as astronomy enthusiasts discovering the cosmos.

Observable Space is backed by top institutional investors-Upfront Ventures, Oceans Ventures, Venrex, Marlinspike Partners, and Embedded Ventures.

Role Summary

We are seeking a highly-motivated and hands-on Senior Spacecraft Thermal Engineer to join our growing team. In this role, you'll design and develop thermal control systems for telescope platforms and spacecraft. You'll work with a multidisciplinary team of optical, electrical, mechanical, and software engineers to ensure thermal stability and performance for ground-based and potential future space-based deployment.

Key Responsibilities

• Design and optimize thermal control systems for spacecraft and telescope platforms (e.g., radiators, heaters, insulation, thermal straps, and enclosures).
• Develop thermal models and perform detailed thermal analysis (steady-state and transient) across operational environments.
• Perform STOP analysis (Structural, Thermal, Optical Performance) to verify system-level thermal stability and its impact on optical performance.
• Conduct FEA simulations for thermal, structural, and environmental conditions.
• Collaborate with optics, mechanical, and electrical teams to ensure proper thermal integration with imaging, tracking, and sensing subsystems.
• Define thermal requirements, margins, and verification strategies for system and subsystem performance.
• Support environmental testing, including thermal vacuum (TVAC), thermal cycling, and validation of thermal models.
• Support the full product lifecycle, from concept design and prototyping to testing and production.
• Participate in and contribute to design reviews (PDR, CDR, etc.) and internal documentation.
• Provide engineering support during fabrication, integration, QC, and system validation.

Basic Qualifications

• Bachelor's degree in Mechanical Engineering, Aerospace Engineering, or equivalent.
• 5+ years of experience in thermal engineering for aerospace or high-performance systems.
• Strong understanding of heat transfer fundamentals (conduction, convection, radiation).
• Experience with thermal analysis tools (e.g., Thermal Desktop, SINDA/FLUINT, ANSYS, or similar).
• Experience developing and validating thermal models for complex systems.
• Effective communicator and collaborator.
• Demonstrated passion for aerospace or observational technologies.

Preferred Qualifications

• Experience with spacecraft thermal control systems and space environments (LEO, GEO, or deep space).
• Understanding of FEA (ANSYS, Nastran, etc.), tolerance analysis, and DFM principles.
• Experience with thermal vacuum (TVAC) testing, thermal cycling, and model correlation.
• Grasp of materials, coatings, surface properties, and thermal interface design.
• Understanding of system engineering workflows, interface control documents, and verification processes.
• Experience working in fast-paced, early-stage or startup environments.
• Basic scripting or automation (Python, MATLAB) for thermal modeling or data analysis.

What We Offer

• Competitive Compensation - A salary package aligned with industry standards and your experience.
• Equity Opportunities - Take part in our success with stock options.
• Flexible Work Environment - Enjoy working from our office or in a hybrid work setup with the flexibility to work remotely part of the week. We require a minimum of 3 days per week in our office to support collaboration and team culture. (LA Office only)
• Unlimited PTO - Take the time you need with our flexible, trust-based vacation policy, including paid holidays. We encourage everyone to rest, recharge, and take care of themselves.
• Health & Wellness - Comprehensive medical, dental, and vision coverage with 100% of the premium paid by the employer for employees.
• Cutting-Edge Tools - Get access to the latest hardware and software you need to do your best work.
• Mission-Driven Culture - Be part of a team working on meaningful challenges with real-world impact.
• Inclusive Team - We foster a supportive and diverse workplace where all voices are valued.

Observable Space is an equal opportunity employer committed to diversity and inclusion in the workplace. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, disability, genetics, or any other basis protected by federal, state, or local law.