Senior OT Consultant

SR2 REC LTD; Sheffield; On-site; GBP 75,000 - 85,000; Full time

Job summary

A leading defence and national security organisation is seeking a Senior Cyber Security Consultant to lead OT cyber security deliverables for a nuclear programme. This role requires DV clearance, strong experience in OT security, and the ability to mentor junior consultants. Key responsibilities include conducting risk assessments and ensuring compliance with standards like IEC 62443. The position offers a hybrid working pattern of up to three days on-site in Sheffield with a salary range of £75,000 - £85,000 for permanent roles.

Qualifications

• Must have Active DV clearance.
• Experience working in highly regulated environments.
• Comfortable mentoring junior team members.

Responsibilities

• Lead OT cyber security deliverables on a nuclear programme.
• Conduct OT security risk assessments on systems and environments.
• Deliver security compliance activities aligned to standards like IEC 62443.
• Produce security documentation and technical guidance.

Skills

Operational Technology (OT) cyber security background

Risk assessments

Threat analysis

Security control implementation

Mentoring junior team members

Job description

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 / IC4 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 IC4 / 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.