OT Security Engineer

Senior OT Security EngineerSalary: Up to £75,000 + Bonus + 10% Pension A leading engineering and technology organisation within the energy sector is seeking a Senior OT Security Engineer to support the delivery of secure, resilient solutions across critical infrastructure projects. This role plays a key part in strengthening the security of systems that underpin the UK's energy network, contributing to a more intelligent and sustainable future. Key ResponsibilitiesProvide expert cybersecurity guidance to project teams across engineering, development and service delivery, ensuring secure-by-design solutions.Design and implement robust security architectures for both software and hardware components, in line with customer and regulatory expectations.Develop and maintain cybersecurity frameworks and models for new and existing systems, aligned with recognised standards such as IEC 62443 and IEC 62351.Identify and implement improvements to cybersecurity processes, enhancing both protection levels and operational efficiency.Produce and oversee Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) documentation, leading security validation activities.Support and mentor project teams throughout the full lifecycle, offering specialist advice on product and system security.Deliver internal training sessions to raise awareness and capability in cybersecurity practices.Track, assess and communicate security risks, issues and mitigation plans to stakeholders and leadership teams.Ensure adherence to corporate policies, compliance requirements and best practices for handling sensitive information.Promote a strong safety-first culture, supporting initiatives that prioritise safe and responsible working environments.Skills & ExperienceProfessional cybersecurity certification completed or underway, e.g. CISSP or IEC 62443-related credentials.Practical experience within Operational Technology (OT) environments or Industrial Control Systems (ICS).Familiarity with industry standards including IEC 62443 and IEC 62351.Understanding of substation automation, protection technologies and communication protocols such as IEC 61850.Awareness of regulatory frameworks such as NIS2 and associated security level requirements.Knowledge of industrial network topologies, e.g. PRP and HSR.Experience with security technologies including firewalls, intrusion detection systems, VPNs and encryption protocols.Strong communication skills, with the ability to engage both technical and non-technical stakeholders.