Senior Thermal Engineer

Leonardo Worldwide Corporation; Luton; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A global leader in aerospace and defense is seeking a Senior Thermal Engineer at their Luton site. This position offers hybrid working flexibility and the chance to impact high-tech defense projects. You'll conduct thermal analyses, provide expert guidance on design improvements, and support product development through all phases. A degree in Mechanical or Aeronautical Engineering and proven expertise in thermal analysis are required. Join us to shape innovation and advance technology.

Benefits

Generous leave with flexi-days

Award-winning pension scheme

Free mental health support

Access to online courses

Flexible working options

Qualifications

• Post-graduate experience in Thermal engineering required.
• Proven expertise in developing equipment for extreme environments.
• Good understanding of environmental testing for design verification.

Responsibilities

• Conduct thermal analysis of mechanical designs.
• Provide guidance on cooling strategies.
• Define thermal requirements for compliance verification.

Skills

Thermal analysis

CFD techniques

Problem-solving

Analytical mindset

Collaboration

Education

Degree in Mechanical or Aeronautical Engineering

Tools

Ansys Icepak

Ansys Fluent

Job description

Get AI-powered advice on this job and more exclusive features.

Overview

Leonardo is 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

• 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 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.

Be part of something bigger - apply now!

Primary Location
GB - Luton - Cap. Green 300

Contract Type
Hybrid

Seniority level
Mid-Senior level

Employment type
Full-time

Job function
Engineering and Information Technology

Industries
Defense and Space Manufacturing, Aviation and Aerospace Component Manufacturing, and Computer and Network Security