Salary: £95,000 - 145,000 per year Requirements: Demonstrable experience in similar roles or transferable skills within a similar role. Familiarity with IEC 62443 and awareness of IEC 62351 for securing power-system communications (e.g., IEC 61850). Certified Information Systems Security Professional (CISSP) and SANS Global Industrial Cyber Security Professional (GICSP) would be a plus. Ability to travel to client sites as required. Cyber Security work experience with a significant focus on Operational Technology. 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. Understanding of cyber resilience plans and re-opener submissions under Ofgem price controls. 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. Standards, frameworks, and regulatory experience including NCSC CAF, EU NIS Directive, ISA/IEC 62443 Series, ISO 27000 Series, NIST Cyber Security Framework (CSF), 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 NCSC CAF, IEC 62443, etc. 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 inspire and empower our team to deliver their best work, promoting growth and success in a supportive and diverse environment. We offer a competitive package, including free single medical cover, enhanced parental leave pay, and membership of employee assistance programs. Our team of Cyber Security professionals works on a wide range of projects across Critical National Infrastructure, National Security, Defence, and the Nuclear market sectors. With a focus on developing solutions that address client challenges, we foster strong relationships and encourage collaboration. This role supports a hybrid working arrangement and provides training opportunities tailored to individual career aspirations. last updated 11 week of 2026