Senior Cyber Security Consultant / Senior OT Consultant
Contract and Perm opportunities
* 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.