Security OT Engineer

Rate: £500 - £550 Inside IR35
Duration: 6 months
Location: South West (Bristol) - 2 days per week onsite

The Role:

We're hiring an experienced Security OT Engineer to support the protection and evolution of complex Operational Technology (OT) and industrial control system environments.

This role sits within a Security Operations function but is heavily engineering focused, combining hands on OT security tooling, detection engineering and incident response to strengthen resilience across critical infrastructure.

Key Responsibilities:

• Act as the OT security engineering SME, supporting both operational and project based activities
• Engineer, configure and optimise OT security platforms (e.g. OT NDR tools such as Claroty or equivalent)
• Develop and refine detection rules, alerting logic and monitoring coverage across OT and IT/OT convergence points
• Lead technical investigations and incident response for OT-related cyber events
• Analyse industrial network traffic to identify anomalies, threats and protocol misuse
• Integrate OT telemetry into SIEM and EDR platforms to enhance visibility and correlation
• Support secure by design initiatives for new OT systems, including segmentation and access control validation
• Assess vulnerabilities in OT systems and implement practical, risk-based remediation strategies
• Drive continuous improvement in OT security posture, tooling effectiveness and detection capability
• Maintain and enhance OT security documentation, playbooks and engineering standards

Experience Required:

• Proven experience in a Security OT Engineer / OT Cyber Security role
• Strong understanding of industrial control systems (ICS) - including SCADA, PLCs, DCS
• Hands-on experience with OT security tools (e.g. Claroty, Nozomi, Dragos or similar NDR platforms)
• Experience with SIEM, EDR and network traffic analysis
• Background in incident response, threat detection and security monitoring within OT or converged environments
• Understanding of network segmentation, secure remote access and OT architecture design

Desirable:

• Certifications such as GICSP, ISA/IEC 62443, Security+ or CEH
• Experience working in critical infrastructure or regulated environments
• Exposure to threat hunting and purple team activities within OT environments

Key Skills & Attributes:

• Strong engineering mindset with a focus on building and improving security capability
• Ability to balance security requirements with operational safety and uptime
• Analytical, detail-oriented and comfortable working with complex OT environments
• Confident communicator, able to engage across security, IT and engineering teams
• Proactive and solution-driven with a focus on continuous improvement

Reasonable Adjustments:

Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients.

If you need any help or adjustments during the recruitment process for any reason, please let us know when you apply or talk to the recruiters directly so we can support you.