Thermal Analysis Engineer

Shape the future of defence technology, join Leonardo!We are seeking an experienced Senior Thermal Engineer to play a key role in the development and production of cutting-edge Electronic Warfare (EW) systems—supporting both new innovations and proven legacy products.Based at our Luton site, this role offers the flexibility of hybrid working and the opportunity to make a tangible impact across a wide range of high-tech defence projects.You’ll work at the heart of multidisciplinary project teams, advising on thermal performance and ensuring our products meet demanding environmental and operational requirements. This role is ideal for someone with a strong analytical mindset, a flair for problem-solving, and the ability to manage complex interdependencies across multiple programmes and business units.What you’ll do as a Senior Thermal Engineer:Conduct thermal analysis of mechanical designs to assess performance and safety using thermal analysis software, CFD techniques, and classical hand calculations. Advise on materials and manufacturing techniques with an emphasis on thermal performance and mechanical integrity. Support product development through all phases—from design and testing to final certification. Deliver thermal solutions that meet performance requirements on time and within budget. Collaborate across sites and with suppliers and customers through occasional travel.Degree in Mechanical or Aeronautical Engineering with post-graduate experience in Thermal engineering. Proven expertise in thermal analysis, with a track record of developing equipment for challenging and extreme operating environments. Proficiency in CFD tools, preferably Ansys Icepak and Ansys Fluent, alongside a solid foundation in classical hand calculation methods. A good understanding of environmental testing for design verification, with familiarity in Mil-Std-810 and RTCA DO-160 standards considered a strong asset. Knowledge of Regulatory Standards including but not limited to: Def Stan 00-970, Health and Safety HSE Regulations including Hazardous Waste Regulation. Compliance with Pressure Equipment Regulation, Pressure System Safety Regulation and Fluorinated Gas Regulations. Awareness of equipment safety compliance requirements, including the ability to support inspection processes and generate fault and failure reports.Security ClearanceWe offer a comprehensive, company-funded benefits package that supports your wellbeing, career development, and work–life balance. Whether you’re looking to grow professionally, care for your health, or plan for the future, we’re here to help you thrive.Secure your Future: Benefit from our award-winning pension scheme with up to 15% employer contribution. Free access to mental health support, financial advice, and employee-led networks championing inclusion and diversity (Enable, Pride, Equalise, Armed Forces, Carers, Wellbeing and Ethnicity). Rewarding Performance: All employees at management level and below are eligible for our bonus scheme. Never Stop Learning: Free access to 4,000+ online courses via Coursera and LinkedIn Learning. Refer a friend: Receive a financial reward through our referral programme. Spend up to £500 annually on flexible benefits including private healthcare, dental, family cover, tech & lifestyle discounts, gym memberships and more. Flexible working: Flexible hours with hybrid working options. For part time opportunities, please talk to us about what might be possible for this role.For a full list of our company benefits please visit our website.Leonardo is a global leader in Aerospace, Defence, and Security. Headquartered in Italy, we employ over 53,000 people worldwide including 8,500 across 9 sites in the UK. At Leonardo we are committed to building an inclusive, accessible, and welcoming workplace. Contract Type:PermanentHybrid Working:Hybrid…