Senior Operational Technology; OT Security Consultant

About the Opportunity

Amentum is looking for Cyber Security Professionals to support our Nuclear market portfolio, delivering security services across Critical National Infrastructure, National Security, Defence and Nuclear sectors.

Initially nuclear‑focused, you will also have opportunities to work across multiple sectors, under a hybrid arrangement, and will report to the Head of Nuclear.

• 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.

• 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.
• 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.
• 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 of networking technologies, architectures, key components, and common IT/OT protocols.
• Certifications in CISA, Industrial Control Systems (ICS), AttackIQ – MITRE ATT'CK, GICSP, CISSP.
• Experience with standards, frameworks, and regulatory requirements such as EU NIS Directive, ISA/IEC 62443, ISO 27000, MITRE ATT'CK, NIST CSF, NCSC CAF, Office for Nuclear Regulation (ONR) Security Assessment Principles, Technical Assessment Guides.

• Competitive package to retain and attract top talent.
• UK employees receive free single medical cover and digital GP service.
• Family‑friendly benefits including enhanced parental leave pay and free membership of employee assistance and parental programmes.
• Reimbursement towards relevant professional development and memberships.
• Collectively programme: matched‑funding, paid volunteering time and charitable donations.

Amentum is an Equal Opportunity Employer and welcomes applications from individuals of diverse backgrounds, including those who may not meet all listed requirements.