Cyber Security Operational Technology (OT) Specialist

Job Title: Cyber Security Operational Technology (OT) Specialist

Location: Immingham, Travel to other sites as required

Salary: £57K - 60K

A leading UK-based power generation company is seeking a Cyber Security Operational Technology (OT) Specialist with experience of developing and implementing security enhancements across OT networks, ideally within the energy sector. The role will report into the Chief Information Security Officer (CISO) and will play a key role within an OT risk management framework which covers multiple generation and storage sites. The role can be based from Immingham or London offices. Regular travel to sites will be required.

Are you passionate about OT Cyber Security and ready to make a tangible impact across multiple UK energy generation and storage sites?

We're looking for a Cyber Security OT Specialist with strong first-line technical skills and a solid grounding in risk management frameworks, ideally with experience in the energy sector. This is a key role within our cyber risk function, supporting our sites' critical infrastructure and helping shape secure and resilient OT environments aligned with IEC62443 standards.

• Lead the implementation of new technical security controls across OT environments.
• Contribute to the assessment of OT network architecture, protocols, and change management processes.
• Lead incident response and remediation for cyber events detected by our OT SIEM systems.
• Actively support vulnerability management and ensure threat exposure is minimised.
• Provide hands-on leadership in data and asset management, including backup and removable media deployments.
• Apply and track security metrics to ensure the ongoing effectiveness of controls.
• Deliver awareness training and cyber security guidance across OT engineering teams.
• Champion collaboration across cyber, IT, and engineering teams-bridging gaps between tech, process, and people.

• The ability to work independently and manage multiple priorities.
• A strong desire to continuously learn, share knowledge, and adapt in a dynamic environment.
• A high regard for environmental, safety, and regulatory standards.
• A keen understanding of the Purdue Model, OT/DMZ/IT network segregation, and energy-sector-specific technologies.
• Demonstrable experience implementing security controls within OT environments.
• Hands-on knowledge of OT technologies and protocols, including experience managing configuration changes.
• Experience working within incident response frameworks-from coordination to containment and recovery.
• Familiarity with threat modelling and architectural reviews, particularly in critical national infrastructure.
• Relevant certifications or credentials in IEC62443 or cyber security frameworks applicable to OT environments.
• Understanding of the NCSC Cyber Assessment Framework (CAF) is highly desirable.

• Work for a company playing a crucial role in energy security and sustainability.
• Be part of an organisation investing in innovation, carbon capture, and hydrogen projects.
• Structured development pathways to support career growth.
• Competitive salary and benefits package, including health and well-being support.

If you're looking for a new challenge within a dynamic and forward-thinking organisation, we want to hear from you!

Apply today and help shape the future of power generation.

Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.