Thermal Systems Engineer

Open Cosmos; Harwell; Hybrid; GBP 40,000 - 60,000; Full time

Benefits offered by this job

Cutting edge space technology work

Diverse and supportive team

Job summary

Open Cosmos in Harwell is seeking an individual to run the thermal work package for multiple missions. Responsibilities include modelling spacecraft thermal behaviour and delivering thermal tests from start to finish. The role involves collaboration with subsystem engineers to enhance product design and execution.

Applicants must have a strong understanding of spacecraft thermal control, proficiency with relevant modelling tools, and a proactive approach in a dynamic environment. The position seeks to contribute to impactful missions in space technology.

Qualifications

• Strong knowledge of spacecraft thermal control and space thermal environments.
• Proficiency with thermal modelling tools such as ESATAN-TMS.
• Proven ability to plan and deliver thermal tests from start to finish.

Responsibilities

• Run the thermal work package for multiple missions.
• Model and analyse spacecraft thermal behaviour.
• Collaborate with other subsystem engineers and support anomaly resolution.

Skills

Spacecraft thermal control knowledge

Proficiency with thermal modelling tools

Ability to deliver thermal tests

Understanding of satellite subsystems

Mission analysis knowledge

Clear communication skills

Proactive and adaptable approach

Tools

ESATAN-TMS

Thermica

Thermal Desktop

Job description

At Open Cosmos we are solving the world’s biggest challenges from space, providing businesses, governments and researchers access to more readily available information than ever before - ready for the challenge? Then read on…

Working in our Chief Technology Office (CTO)

The CTO division is where Open Cosmos technology comes to life. Covering engineering, product development, and technical innovation, the team designs, builds, and operates the satellites, systems, and platforms that make our missions possible. It’s a highly collaborative environment where ideas become real hardware, software, and data solutions that deliver impact from space.

Our Systems Team brings together brilliant Systems, AOCS and Thermal Engineers who turn ambitious mission concepts into reality. They design, integrate, and optimise every detail – from spacecraft architecture to next-generation optical payloads – making sure every system fits, works, and thrives in orbit. From first sketch to launch day, they own the journey, ensuring our satellites deliver maximum impact back on Earth.

What You'll Be Doing

You’ll run the thermal work package for multiple missions, model and analyse spacecraft thermal behaviour, and plan and run thermal tests. You’ll work hands‑on during AIT, support anomaly resolution, and be part of the team that ensures Open Cosmos missions perform as expected in space.

You’ll also collaborate with our other subsystem engineers, feed into our product roadmap, and help us continuously improve how we design and deliver missions.

What You’ll Bring

We’re looking for someone who combines technical depth with a collaborative spirit. You should have:

• Strong knowledge of spacecraft thermal control and space thermal environments
• Proficiency with thermal modelling tools (e.g. ESATAN-TMS, Thermica, Thermal Desktop)
• Proven ability to plan and deliver thermal tests from start to finish
• Solid understanding of satellite subsystems and confidence working across disciplines
• Knowledge of mission analysis and overall space system design
• Clear communication skills – comfortable engaging with colleagues, partners, and customers
• A proactive, adaptable approach that thrives in a fast‑moving, growing company

For this role you can be based in either Harwell, UK, Porto, Portugal or Barcelona, Spain.

To apply, you must have the legal right to work in your chosen location.

Please submit your application in English.

Why Open Cosmos?

• Work at the cutting edge of space technology with customers around the globe
• A mission‑driven company making space accessible to help solve real‑world challenges
• A diverse, ambitious, and supportive team

Equal opportunity employer

At Open Cosmos, we are dedicated to fostering a workplace built on respect, dignity, and belonging. As an equal opportunity employer, we actively challenge bias to ensure every candidate and employee feels truly welcome. We celebrate diversity in all its forms and are committed to maintaining an inclusive environment where everyone has the opportunity to thrive.