Senior Thermal Engineer

Senior Thermal Engineer

We're seeking an experienced Senior Thermal Design Engineer to lead the design, analysis, and validation of spacecraft thermal control systems. You'll play a key role in developing models, defining control strategies, and supporting testing to ensure mission-critical performance and reliability. Working closely with multidisciplinary engineering teams, you'll help deliver innovative thermal solutions that meet the demanding requirements of space applications.

Location: London

On Site: Remote

Clearance: SC

Experience Level: Mid - Senior

Key Responsibilities:

• Lead the end-to-end thermal design and simulation process for spacecraft components and subsystems.
• Build and validate detailed thermal models using specialist engineering software.
• Define and implement effective thermal control strategies using both active and passive methods, such as heat pipes, radiators, insulation, and heaters.
• Support all levels of testing, from component evaluation to full spacecraft system trials.
• Plan and oversee environmental qualification tests, including thermal vacuum campaigns, and review results to verify performance.
• Participate in key engineering milestones, design reviews, and technical discussions throughout the project lifecycle.
• Ensure all thermal systems comply with internal standards, performance targets, and customer expectations.
• Work collaboratively with cross-functional teams including mechanical, systems, electrical, and propulsion engineers to ensure seamless integration.
• Provide technical leadership, mentoring less experienced engineers, and encouraging best practice across the team.
• Produce and maintain high-quality engineering documentation, including test procedures, reports, specifications, and technical drawings.

Required Skills:

• Essential: Proven experience working within the space sector, supporting spacecraft or satellite programmes.
• Approximately 10+ years of experience in thermal design and analysis for space applications.
• Proficiency in thermal analysis tools (such as ESATAN-TMS, Thermal Desktop, or similar) and 3D CAD software.
• Strong understanding of heat transfer mechanisms, space environments, and thermal control design principles.

Required Qualifications:

• A Bachelor's or Master's degree in Engineering, or equivalent military experience.

Desirable Skills:

• Ability to work autonomously while contributing effectively in a multidisciplinary team.
• Experience mentoring or technically guiding other engineers is advantageous.
• Experience planning and conducting thermal and environmental testing campaigns.
• Familiarity with flight hardware development and qualification processes.
• Excellent communication, documentation, and teamwork skills.

Additional Information

We bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.

At ALTEN, you'll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.

Join a passionate team and help build tomorrow, today.

In short you get:

• A personalised career path and a rewarding management style
• A huge diversity of engineering projects and industries
• Private Medical Insurance
• Cycle & Tech Scheme
• Employee assistance programme
• Life insurance & Pension Scheme
• Social atmosphere, regular gatherings & team buildings
• Flexible way of working (role dependent)

ALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know.