Expleo Group

OT Cybersecurity Engineer

Expleo Group

full-time

Posted on:

Location Type: Hybrid

Location: Bristol • United Kingdom

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Tech Stack

Cyber Security

About the role

  • Act as the cybersecurity technical lead within a key UK rail sector client engagement, focusing on protecting operational technology (OT) and safety-critical systems.
  • Provide hands-on technical leadership to guide the secure delivery of client-specific systems and solutions, ensuring alignment with project requirements, sector standards, and regulatory obligations.
  • Collaborate with client engineering and programme teams to integrate cybersecurity into system design, deployment, and ongoing operations.
  • Define cybersecurity requirements within the client’s environment, including rail-specific systems, legacy OT, and modern industrial platforms.
  • Support developing and delivering security risk assessments, threat models, and control frameworks following the relevant standards.
  • Contribute to the production and review of assurance artefacts, including security cases, risk registers, control implementation evidence, and compliance documentation.
  • Provide expertise on OT protocols, SCADA systems, field devices, and network architecture relevant to the client’s operational landscape.
  • Engage regularly with client stakeholders, suppliers, and technical teams to ensure effective collaboration and secure outcomes across the delivery lifecycle.
  • Mentor and support other team members embedded within the client account, ensuring technical consistency and alignment to Expleo’s delivery standards.
  • Participate in knowledge sharing and capability development activities within the Cybersecurity Practice, contributing insights from the client engagement.

Requirements

  • A degree (or equivalent experience) in Cybersecurity, Systems Engineering, Electrical/Electronic Engineering, or a related technical discipline.
  • Recognised cybersecurity certifications: CISSP, CISM, CISA, GICSP, SABSA, or equivalent.
  • Technical certifications or training aligned to OT security: IEC 62443, GIAC GRID/GICSP, SCADA/ICS security, or vendor-specific OT platforms.
  • Familiarity with rail sector security and safety standards is highly desirable.
  • Understanding of relevant UK regulatory frameworks, including NIS/NIS2 Regulations and UK CNI expectations.
  • Additional certifications or practical experience in Secure by Design, systems assurance, or control systems architecture are advantageous.
  • Evidence of continued professional development aligned with OT security trends, critical infrastructure resilience, and systems assurance practices.
Benefits
  • Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges
  • We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
  • Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
  • Competitive company benefits
  • Always working as one team, our people are not afraid to think big and challenge the status quo
  • As a Disability Confident Committed Employer we have committed to: Ensure our recruitment process is inclusive and accessible Communicating and promoting vacancies Offering an interview to disabled people who meet the minimum criteria for the job Anticipating and providing reasonable adjustments as required Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people
  • “We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”. We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
cybersecurityoperational technologysecurity risk assessmentsthreat modelscontrol frameworksOT protocolsSCADA systemsnetwork architecturesystems assurancecontrol systems architecture
Soft Skills
technical leadershipcollaborationmentoringknowledge sharingstakeholder engagement
Certifications
CISSPCISMCISAGICSPSABSAIEC 62443GIAC GRIDSCADA/ICS security