ALTEN is hiring a 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.