Job Description

OT Cyber Security Analyst
Culham, Oxfordshire (2 days onsite per week)
50/hour Umbrella 36.43/hour PAYE
Contract until 18th December 2026
Active SC Clearance Required (or lapsed within last 12 months)

A government backed organisation is hiring an OT Cyber Security Analyst with industry experience in Oil & Gas or Chemical. You must a strong background in SIEM & SOC integration coupled with OT security frameworks IEC 62443, NIST CSF, CAF, ISO 27001 to support the protection and continuous improvement of Operational Technology (OT) environments across critical infrastructure and industrial systems.

This is an exciting opportunity to join a highly secure and technically advanced environment working on large-scale, mission-critical infrastructure programmes.

The Role
You will play a key role in implementing, operating, and improving OT cyber security controls across complex ICS and critical infrastructure environments. The role combines hands-on security engineering with governance, policy creation, monitoring, and operational support.
Working closely with engineering teams, SOC providers, and managed service partners, you will help ensure OT systems remain secure, compliant, and aligned to industry frameworks such as IEC 62443, NIST CSF, CAF, and ISO 27001.

Key Responsibilities

• Implement and maintain OT security controls across industrial environments
• Support OT network segmentation and secure remote access solutions
• Integrate OT environments into SIEM/SOC platforms
• Develop and tune OT threat detection rules
• Conduct OT security assessments, gap analysis, and remediation planning
• Support OT incident response and investigation activities
• Collaborate with engineering and operations teams to implement secure changes
• Produce governance documentation, standards, and reporting artefacts
• Track OT security maturity and continuous improvement initiatives

Essential Experience

• Previous experience within OT/ICS or critical infrastructure environments
• Background within sectors such as oil & gas, rail, utilities, manufacturing, or chemical processing
• Strong understanding of OT security frameworks including IEC 62443, NIST CSF, CAF, and ISO 27001
• Experience implementing OT security strategies, controls, and standards
• Knowledge of industrial networks, segmentation, and OT protocols
• Experience working with engineering and operational technology teams
• Strong documentation and stakeholder communication skills
• Familiarity with SIEM/SOC integration within OT environments
• Active SC Clearance (or lapsed within the last 12 months)
• Maximum 2 week notice period

Desirable

• OT asset discovery and monitoring tool experience
• Exposure to NIS regulations / UK CAF compliance
• Experience with ITSM and service delivery processes

One stage interview process, via MS Teams.