Location: Crawley, 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.
Join Thales at a pivotal time as we expand our Cyber Security capability across critical national infrastructure, defence, and aerospace programmes. As a Penetration Tester, you’ll play a key role in identifying vulnerabilities across complex systems and helping secure technologies that truly matter.
From secure software to biometrics and encryption, our CDI technologies and services enable organisations to confidently authenticate identities and protect data with care and precision. We support businesses and governments in keeping people safe and enabling trusted services across personal devices, connected objects, the cloud and everything in between.
The Opportunity
You’ll work on high-impact projects, performing penetration testing across IT and OT environments while influencing secure design and risk mitigation strategies from early project stages through to delivery.
What You’ll Be Doing
- Conduct penetration testing across Windows, Linux, mobile (iOS/Android), web applications, and cloud environments
- Identify, exploit, and clearly communicate security vulnerabilities and risks
- Support accreditation and assurance activities on complex, high-security programmes
- Advise on security controls and mitigation strategies aligned to customer needs
- Contribute to governance frameworks, policies, and secure operating procedures
- Produce high-quality technical reports and through-life security documentation
- Act as a cybersecurity SME across projects, staying aligned with evolving regulations and standards
- Collaborate with internal teams, customers, and external stakeholders at all levels
- Support bid activities, including technical input and effort estimation
What We’re Looking For
- Hands‑on penetration testing experience across diverse platforms (IT and/or OT environments)
- Strong understanding of security testing methodologies and frameworks
- Experience producing clear, actionable technical reports
- Degree in Computer Science, Engineering, or equivalent experience
- Industry certifications such as CREST, OSCP, CEH, GPEN, GXPN (or similar)
Desirable Experience
- Background in Defence, Aerospace, Government, Nuclear, Transport, or other regulated industries
- Familiarity with compliance‑driven environments and secure system accreditation
Why Thales?
- Work on mission‑critical systems that protect national security and infrastructure
- Opportunities to move across domains, technologies, and international locations
- Clear pathways into technical leadership or people management
- Be part of a globally recognised engineering and technology organisation
Benefits
- Performance‑related bonus
- Half day every Friday, usually finishing around 13:00
- 28 days annual leave (plus bank holidays) with opportunity to buy up to 40 hours/year (pro rata)
- 24 hours volunteering paid for
- Private healthcare
- Pension schemelift?
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