Senior Thermal Engineer H/F - 31

About the Company

Established in 2017, Infinite Orbits is a NewSpace company, based in Toulouse, pushing the boundaries of in-orbit services with cutting-edge spacecraft driven by its own Rendez-Vous solution, an advanced Autonomous Vision-Based Navigation Solution. IO has two generations of missions

"Orbit Guard" provides Inspection and Space Situational Awareness services in GEO. Our first, OG-1 was launched on 1 May 2023, the second is launching in 2025 and the third third launching in 2026.

"Endurance" is a docking service capable of extending the life of GEO telecom satellites, by taking over AOCS takeover for 5 years.


To complete our dynamic and international team, we are looking for a Senior Thermal Engineer to lead the thermal design, analysis, and verification of high-performance systems such as spacecraft, satellites, avionics, or aerospace structures. This role involves ownership of thermal subsystem architecture, modelling, and validation, ensuring thermal control requirements are met under a wide range of operating conditions.

Job Description

Thermal Design & Analysis

- Lead thermal design efforts from concept through delivery for spacecraft, payloads, electronics, or mechanical systems.
- Develop thermal control systems using passive (radiators, insulation, thermal straps) and active (heaters, loop heat pipes, pumped loops) solutions.
- Perform thermal modeling and simulation using tools such as Thermal Desktop, ESATAN, Sinda/Fluint, Ansys Icepak, or equivalent.

System Integration & Requirements

- Define and manage thermal requirements based on mission needs and environmental constraints.
- Develop and maintain thermal mathematical models (TMMs) at both component and system levels.
- Ensure proper thermal interfaces between subsystems (mechanical, electrical, payload, etc.).

Verification & Testing

- Develop and execute thermal test plans including:
- Thermal balance tests
- Thermal vacuum tests (TVAC)
- Bakeout and thermal cycling
- Correlate thermal models with test data and refine predictions accordingly.

Documentation & Reporting

- Prepare technical documentation, including thermal design reports, analyses, test plans, and compliance matrices.
- Support internal and customer design reviews (SRR, PDR, CDR, TRR).

Mentorship & Leadership

- Mentor junior engineers and guide best practices in thermal design and simulation.
- Provide technical leadership within multidisciplinary project teams.