OT Cyber Security Analyst

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 initiativesEssential 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 periodDesirable

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
Only candidates based in UK and eligible to work in UK are allowed