
Location: Belfast, United Kingdom
Thales is a global technology leader with more than 83,000 employees on five continents. With over 7,500 people in the UK, operating across defence, space, aerospace, and digital security, we help build a future we can all trust. Thales supports the security and stability of our nation by providing extraordinary technology to our customers, as well as delivering social value to the UK with our products and services.
Known internally as System Safety & Environmental Engineer
Location: based in Belfast, 4.5 days/ week onsite, with travel
Other: permanent, full-time, for eligible candidates, relocation support can be provided
Help shape the safety of next-generation defence technologies, ensuring mission-critical systems are safe, compliant and certifiable throughout their lifecycle.
As a Senior System Safety & Environmental Engineer, you'll ensure Thales products achieve certification, meet stringent safety standards and perform safely in operational environments. You'll lead hazard analysis, define safety requirements and drive risk reduction activities across complex engineering programmes. From concept and design through to verification, certification and deployment, you'll provide technical leadership on safety-critical hardware and programmable elements, influencing engineering decisions and developing compelling safety cases backed by robust assurance evidence. Your work will directly enable the delivery of safe, compliant and trusted solutions for our customers.
We're seeking candidates with a strong Systems Safety Engineering background, ideally with experience in software safety assurance. While software safety expertise is highly desirable, we are also keen to hear from experienced Safety Engineers from aerospace, defence or other highly regulated industries.
Building a Future, we can all trust.
Integrated Airspace Protection Systems (IAS) - our main purpose is to protect and defend. We provide rapid integrated solutions for detection, coordination, fire control, engagement and support. We cover three sectors: Surface Attack & Air Defence (UK), Air Defence (International) and Air Operations & Services as well as Space.
We offer a competitive salary and benefits package designed to support our employees’ wellbeing and professional growth, which includes:
At Thales, we are committed to equal opportunities and welcome all talented individuals to consider joining our team. So even if you don't match every statement below but feel you have some of the experience, knowledge or skills needed for this role, we encourage you to apply. It will take all of us working together to deliver solutions to the world’s most critical challenges.
Ready to influence the safety of some of the world's most advanced defence systems? Join Thales and play a key role in delivering the next generation of safe, compliant and mission-ready technology.
Due to the nature of the work that we do at Thales, many of our roles are subject to security restrictions. This role requires Security Clearance (SC). It would be advantageous if currently held, however, if not currently held, it is a requirement that the successful applicant undergo, achieve, and maintain SC Clearance prior to commencing employment.
To be eligible for full SC, you generally need to have resided in the UK for the last 5 years. In some circumstances, a minimum of 3 years’ residence in the UK over the last 5 years may be accepted, with additional overseas checks.
Please visit the UKSV website for further guidance: https://www.gov.uk/government/publications/united-kingdom-security-vetting-clearance-levels/national-security-vetting-clearance-levels.
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At Thales, we ensure equal opportunities, pay and working conditions for all. The benefits we offer include private medical insurance, buying or selling annual leave, cycle to work schemes, employee discounts, paid volunteering day, stocks and shares, annual bonus and much more depending on the role. Read more about our benefits here.
We are committed to creating a workplace where everyone feels valued for who they are and the unique strengths they bring. Discover more about our programmes, employee networks, wellbeing policies, and inclusive features here.
If this role isn’t quite right for you, we encourage you to join our talent community where your details will be shared with our recruitment teams for other potential opportunities. Join the Talent Community here.
Join Thales in the UK – Innovate with us and shape the future!

Thales (Euronext Paris: HO) is a global leader in advanced technologies for the Defence, Aerospace, and Cyber & Digital sectors. Its portfolio of innovative products and services addresses several major challenges: sovereignty, security, sustainability and inclusion.
The Group invests more than €4 billion per year in Research & Development in key areas, particularly for critical environments, such as Artificial Intelligence, cybersecurity, quantum and cloud technologies.
Thales has more than 83,000 employees in 68 countries. In 2024, the Group generated sales of €20.6 billion.