Penetration Tester — High-Impact Cyber Security (UK)

Thales; West of England; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Performance-related bonus

Half day Friday

28 days annual leave

Volunteer hours

Private healthcare

Pension scheme

Job summary

Thales in the United Kingdom is seeking a hands-on Penetration Tester to strengthen cyber security across IT and OT environments. You will conduct testing across Windows, Linux, mobile, web, and cloud, influencing secure design from early project stages.

You’ll produce clear technical reports, advise on risk-based controls, and collaborate with internal teams and customers on security improvements. The role offers the chance to work on mission-critical systems and grow into technical leadership.

Qualifications

• Hands-on penetration testing across IT and OT environments.
• Strong knowledge of security testing methodologies and frameworks.
• Experience producing actionable technical reports.
• Degree in Computer Science or Engineering.
• Industry certifications such as CREST, OSCP, CEH, GPEN, GXPN.

Responsibilities

• 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.

Skills

Penetration testing

IT/OT security

Security reporting

Degree in CS/Engineering

CREST

OSCP

CEH

GPEN

GXPN

Education

Bachelor's degree in Computer Science or Engineering

Job description

Thales in the United Kingdom is seeking a hands-on Penetration Tester to strengthen cyber security across IT and OT environments. You will conduct testing across Windows, Linux, mobile, web, and cloud, influencing secure design from early project stages.

You’ll produce clear technical reports, advise on risk-based controls, and collaborate with internal teams and customers on security improvements. The role offers the chance to work on mission-critical systems and grow into technical leadership.