In this role, you will lead the technical assurance and delivery of cybersecurity activities across a programme of work involving legacy and modern OT systems, rail-specific technologies, and industrial control components. You will work closely with engineering and operational teams to embed cybersecurity across the lifecycle, ensuring alignment with UK rail regulations, industry standards, and best practices. ResponsibilitiesAct 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 opera