Thermal Systems Simulation and Design Engineer in Hampshire, Portsmouth

HyFlux LTD is a clean aviation technology company developing superconducting cryogenic electric motors to transform aircraft propulsion. Our mission is to pioneer cryogenic electric propulsion solutions that radically improve aircraft performance, efficiency, and environmental impact, leading to true zero emissions propulsion. Our vision is to become a global leader in sustainable aerospace propulsion, delivering transformational technology with measurable impact for investors, partners, and the planet.

We have recently been awarded a grant in excess of £1 million from the UK’s Aerospace Technology Institute and are now seeking a Thermal Systems Engineer to expand our team to deliver this project and develop our technology.

We are seeking a highly skilled Thermal Systems Simulation and Design Engineer to design, analyse, and optimize thermal management systems for electric aircraft propulsion. This role includes expertise in cryogenic systems, advanced simulation techniques, and performance evaluation to ensure efficient and reliable thermal solutions in aerospace applications.

• Develop and implement thermal simulation models to analyse heat transfer, fluid dynamics, and cooling systems within aircraft components.
• Conduct computational fluid dynamics (CFD) simulations and finite element analysis (FEA) to assess thermal performance.
• Design and optimize thermal management systems, including cryogenic cooling solutions for next-generation aviation technologies.
• Evaluate cryogenic fluid behaviours, insulation techniques, and heat dissipation strategies for aircraft applications.
• Conduct experimental validation of thermal and cryogenic models and assist with testing procedures.
• Ensure compliance with aerospace regulations and standards (FAA, EASA, AS9100, etc.).
• Drive innovation in thermal and cryogenic engineering solutions for sustainable aviation technologies.
• Identify and pursue opportunities for technical innovation and intellectual property (IP) development, publication and conferences.

• Bachelor's or Master's degree in Mechanical Engineering, Aerospace Engineering, or a related field.
• Proven experience in thermal systems design and simulation within the aviation or aerospace industry.
• Experience in thermal systems simulation and design for electric aircraft or electric propulsion systems.
• Expertise in cryogenic systems, including phase-change cooling, storage, insulation, and fluid dynamics.
• Proficiency in simulation tools such as ANSYS, MATLAB, COMSOL, Fluent, STAR-CCM+, or equivalent.
• Strong understanding of heat transfer principles, thermodynamics, and fluid mechanics.
• Experience with materials selection for thermal and cryogenic applications in aerospace environments.
• Knowledge of aircraft systems, propulsion technology, and avionics cooling solutions.
• Ability to interpret thermal and cryogenic testing data and experimental results.
• Excellent problem-solving and analytical skills with attention to detail.

• PhD in Thermal Engineering, Aerospace Engineering, or a related discipline.
• Experience with AI-driven thermal simulations and digital twin technologies.
• Exposure to cryogenic cooling technologies for high-performance aerospace applications.
• Familiarity with sustainable aviation technologies, including hydrogen-electric and hybrid propulsion systems.

The TSS&DE reports to the Engineering Director and will also report indirectly to the Project Manager. The TSS&DE will develop and maintain excellent working relationships with staff in the Company. They will also work with external suppliers and other internal areas as required to perform effectively in the position.

• Competitive salary based on experience.
• 25 days’ annual leave plus bank holidays.
• Company pension scheme.
• Flexible working hours.
• Professional development opportunities and training support.
• Employee share option scheme.

• Work on cutting-edge aerospace technologies and contribute to next-generation aircraft designs.
• Collaborate with industry-leading experts in thermal and cryogenic engineering.
• Be part of an innovative team driving advancements in sustainable aviation.
• Be part of a small team at the start of its growth journey where your voice will be heard and you can help shape the future.
• Competitive salary, benefits, and opportunities for professional growth.

Please send your CV and a brief cover letter outlining your suitability for the role to info@hyflux.aero with the subject line Thermal Systems Engineer – TSE_001. Deadline for applications: Friday, 28th November 2025. Interviews will be conducted on a rolling basis, so early applications are encouraged.

Hyflux Ltd is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.