Senior OT Consultant

SR2 - Socially Responsible Recruitment; Sheffield; Hybrid; GBP 75,000 - 85,000; Full time

Job summary

A leading defence and national security organisation in Sheffield is looking for a Senior Cyber Security Consultant/Senior OT Consultant. The ideal candidate will have active DV clearance and a solid background in Operational Technology cyber security. They will lead security deliverables on significant defence programmes, conduct risk assessments, and mentor junior consultants. The position offers hybrid working, with a salary range of £75,000 - £85,000, or a contract day rate of £600-£750.

Qualifications

• Must have Active DV clearance.
• Practical experience with IEC 62443 deliverables.
• Experience in regulated or critical national infrastructure environments.

Responsibilities

• Lead OT cyber security deliverables on a major nuclear/defence programme.
• Conduct OT security risk assessments on equipment and systems.
• Mentor junior consultants and support quality assurance.

Skills

Operational Technology (OT) cyber security background

Risk assessment and threat analysis

Mentoring junior team members

Job description

Senior Cyber Security Consultant/Senior OT Consultant
Location: Sheffield
Working Pattern: Hybrid – up to 3 days a week onsite
Clearance: DV Clearance Essential
Employment Type: Permanent or Contract
Salary (perm): £75,000 - £85,000
Day rate (contract): £600-£750
IR35 status: Inside

About the Organisation

A leading defence and national security organisation is seeking a Senior Operational Technology (OT) Consultant/Senior Cyber Security Consultant to support a major new facility build within the defence nuclear sector. You'll join a small cyber/OT team with Principals and Junior Consultants. The role exists to take workload from Principal Consultants while also mentoring juniors and delivering hands‑on technical work.

Key Responsibilities

• Lead OT cyber security deliverables on a major nuclear/defence programme.
• Conduct OT security risk assessments on equipment, systems and industrial environments.
• Coordinate with project teams and vendors to gather technical information and validate system details.
• Deliver security compliance activities and technical implementation aligned to standards such as IEC 62443.
• Produce security documentation, risk records and technical guidance.
• Mentor junior consultants and support quality assurance across their work.
• Contribute to secure design, architecture and control implementation in OT/ICS environments.

Essential Experience

• You must have Active DV clearance – we cannot put you through this if you do not already have it
• Strong Operational Technology (OT) cyber security background
• Practical experience delivering components of IEC 62443 (certificate not necessary)
• Experience with risk assessments, threat analysis and security control implementation
• Ability to engage with vendors and engineering teams to source and verify technical information
• Experience working in highly regulated or critical national infrastructure environments
• Comfortable mentoring junior team members

Desirable Experience

• Defence, nuclear or wider CNI sector experience
• Knowledge of NCSC, NIST CSF, or ISO 27001
• Understanding of ICS/SCADA, PLCs, and industrial protocols

Please apply with a copy of your CV and Emma from SR2 will reach out to potential candidates regarding next steps.