Senior Thermal Engineer

Leonardo; Luton; Hybrid; GBP 70,000 - 95,000; Full time

Benefits offered by this job

Hybrid working

Pension scheme

Employee learning resources

Bonus scheme

Referral programme

Private healthcare

Flexible benefits

Career development

Job summary

Leonardo UK in Luton is seeking a Senior Thermal Engineer to lead thermal analysis for cutting-edge EW systems, advising on cooling, materials, and verification across programs. Based at our Luton site with hybrid working, you will influence design choices and ensure products meet stringent environmental and operational requirements.

You will work within multidisciplinary teams, travel to supplier sites as needed, and contribute to documentation, peer reviews, and stage/gate approvals while

Qualifications

• Degree in Mechanical or Aeronautical Engineering with post-graduate thermal engineering experience.
• Proven thermal analysis expertise and track record in challenging environments.
• Familiarity with regulatory standards (Def Stan 00-970, HSE, Pressure Equipment) and safety compliance.

Responsibilities

• Conduct thermal analysis of mechanical designs to assess performance and safety using CFD tools and hand calculations.
• Provide expert guidance on cooling strategies and thermal design improvements.
• Advise on materials and manufacturing techniques with emphasis on thermal performance and integrity.
• Define thermal requirements and verify compliance across Leonardo products.
• Drive innovation in thermal design with new technologies and methodologies.
• Support product development through design, testing, and final certification stages.
• Deliver thermal solutions that meet performance targets on time and within budget.
• Contribute to technical documentation for peer reviews and stage/gate approvals.
• Collaborate across sites and with suppliers and customers including travel.

Skills

Thermal analyses

CFD tools

Environmental testing

Regulatory standards

Materials & manufacturing

Travel readiness

Education

Mechanical or Aeronautical Engineering degree

Post-graduate Thermal engineering experience

Tools

Ansys Icepak

Ansys Fluent

Hand calculations

Job description

Your impact

Shape the future of defence technology, join Leonardo!

Job Description

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.
• Provide expert guidance on cooling strategies and recommend thermal design improvements as required.
• Advise on materials and manufacturing techniques with an emphasis on thermal performance and mechanical integrity.
• Define thermal requirements and develop methods for verifying compliance across Leonardo products.
• Drive innovation in thermal design, introducing new technologies and methodologies.
• 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.
• Contribute to technical documentation, including material for peer reviews and stage/gate approvals.
• Collaborate across sites and with suppliers and customers through occasional travel.

What You’ll Bring

• 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.

This is not an exhaustive list, and we are keen to hear from you even if you might not have experience in all the above. The most important skill is a good attitude and willingness to learn.

Security Clearance

This role is subject to pre‑employment screening in line with the UK Government’s Baseline Personnel Security Standard (BPSS). An additional range of Personnel Security Controls referred to as National Security Vetting (NSV) may apply, this could include meeting the eligibility requirements for The Security Check (SC) or Developed Vetting (DV). For more information and guidance please visit: https://careers.uk.leonardo.com/gb/en/security-and-vetting

Why join us

At Leonardo, our people are at the heart of everything we do. We 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.

• Time to Recharge: Enjoy generous leave with the opportunity to accrue up to 12 additional flexi‑days each year.
• Secure your Future: Benefit from our award‑winning pension scheme with up to 15% employer contribution.
• Your Wellbeing Matters: 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.
• Tailored Perks: 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 UK operates a grade‑based salary framework with broad bands. The salary range shown reflects the approved grade band for this role, or a narrower hiring range published within that band, and is benchmarked against the external market. Exceptions above the standard range are managed through governance controls to protect internal equity.

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. Our employees are not just part of a team—they are key contributors to shaping innovation, advancing technology, and enhancing global safety.

At Leonardo we are committed to building an inclusive, accessible, and welcoming workplace. We believe that a diverse workforce sparks creativity, drives innovation, and leads to better outcomes for our people and our customers. If you have any accessibility requirements to support you during the recruitment process, just let us know.

Primary Location

GB - Luton - Cap. Green 300

Contract Type

Permanent

Hybrid Working

Hybrid