Salary: £95,000 - 145,000 per year Requirements: Experience in similar roles or transferable skills within a similar role. Certified Information Systems Security Professional (CISSP) or Certified Information Security Management (CISM) qualification. SANS Global Industrial Cyber Security Professional (GICSP) would be a plus. Able to travel to the client site on a semi-regular basis, averaging two to three days per week. Cyber Security work experience (with a significant focus on Operational Technology during that time). Practical experience of IT and OT cyber security risk/threat assessment approaches. Understanding of design considerations with emphasis on operational safety and the availability/security of operating environments. Working knowledge and hands-on experience in a variety of operating systems and Operational Technology environments. Experience of security engineering and associated solutions (Endpoint Protection, IDS/IPS, Firewalls, etc.) for IT and OT environments. Working knowledge and understanding of networking technologies including architectures, key components, and common IT/OT protocols. Certifications – Cybersecurity & Infrastructure Security Agency (CISA) Industrial Control Systems (ICS) Training, AttackIQ – MITRE ATT&CK, SANS Global Industrial Cyber Security Professional (GICSP), Certified Information Systems Security Professional (CISSP). Standards, frameworks, and regulatory experience including – EU NIS Directive, ISA/IEC 62443 Series / ISO 27000 Series, MITRE ATT&CK, NIST Cyber Security Framework (CSF), NCSC CAF, Office for Nuclear Regulation (ONR) Security Assessment Principles, Technical Assessment Guides, and supplementary guidance. Responsibilities: Develop security requirements, architecture, and design for complex OT systems. Develop cyber security assessment approaches. Specify and implement a robust security risk management process. Support accreditation activities with the client and regulating authorities. Conduct security reviews and risk assessments in accordance with IEC 62443. Provide technical assistance to business development. Maintain familiarity with legislation and regulations of relevance. Build and maintain relationships with internal and external stakeholders. Technologies: Support Security More: At Amentum, we are excited to offer an opportunity to join our growing team of Cyber Security professionals, working across a diverse client portfolio in Critical National Infrastructure, National Security, Defence, and the Nuclear market sectors. We foster a collaborative environment and support your career development through various training opportunities, all while maintaining a strong team culture. Our employees enjoy a competitive benefits package, including free medical cover, family-friendly benefits, and opportunities to engage in community support. We are committed to safety, integrity, inclusion, and diversity, and we strive to create a workplace where every individual can succeed. last updated 11 week of 2026