OT Security Engineer

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.