Cyber Security Operational Technology (OT) Specialist

Rullion Managed Services; Immingham; Hybrid; GBP 57,000 - 60,000; Full time

Job summary

A leading UK-based power generation company is searching for a Cyber Security Operational Technology Specialist to enhance security across OT networks. This role involves implementing security controls, managing incident responses, and ensuring compliance with risk management frameworks. Candidates should possess strong technical skills and relevant certifications. Competitive salary and benefits are offered in a dynamic environment focused on innovation and sustainability.

Benefits

Health and well-being support

Structured development pathways

Participation in innovation projects

Qualifications

• Experience implementing security controls within OT environments.
• Hands-on knowledge of OT technologies and protocols is essential.
• Experience working within incident response frameworks.

Responsibilities

• Lead implementation of new technical security controls across OT environments.
• Oversee incident response and remediation for detected cyber events.
• Champion collaboration across cyber, IT, and engineering teams.

Skills

Technical Security Skills

Risk Management

Incident Response

Vulnerability Management

Collaboration Skills

Education

Relevant Cyber Security Certifications

Tools

OT Technologies

OT Protocols

Job description

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.

The Role

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.

Key Responsibilities

• 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.

What We Are Looking For

• 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.

Why Join Us?

• 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.

Ready to Apply?

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.