This client is seeking a Senior Operational Technology (OT) Engineer / Technician to join our Engineering team in Lincoln. This is a hands-on, build-focused role supporting the modernisation and upgrade of Small Gas Turbines.This position is not a desk-based cyber security or IT compliance role. We are looking for someone who is comfortable physically building, configuring, and commissioning industrial hardware and HMI systems, while applying cybersecurity principles in real-world operational environments.If your experience is rooted in industrial control systems, OT environments, and practical hardware build and testing, we want to hear from you.The RoleWorking as part of the Engineering team, you will be responsible for the build, configuration, development, testing, and support of industrial Human Machine Interface (HMI) systems, covering both hardware and software. These systems form a critical part of Siemens Energy turbine upgrade projects and are deployed into live industrial environments worldwide.You will work closely with Project Execution and Field Service teams to ensure systems are built correctly, tested thoroughly, and commissioned successfully.Key ResponsibilitiesHands-on System Build & ConfigurationPhysically build, configure, and test standardized HMI systems on:Industrial PCsWindows-based servers and client endpointsInstall and configure engineering and HMI software, including:AVEVA InTouchFactoryTalk OptixSiemens WinCC / PCS 7OT Cybersecurity Implementation (Practical)Apply cybersecurity measures directly to OT systems, including:Windows OS hardeningEndpoint security solutionsApplication whitelistingSecure backup and recovery configurationsImplement security in line with industrial standards as part of the build, not just documentation or compliance activities.Industrial NetworkingConfigure and test industrial networking components, including:Industrial firewallsManaged switchesSecure OT network architecturesEngineering & Delivery SupportDevelop and maintain work instructions and build documentationCreate and maintain engineering information databasesSupport the Project Execution team to improve quality, consistency, and on-time deliveryDiagnose and resolve hardware and software issues identified during factory testingProvide technical support to Field Service teams during commissioning and site deploymentEssential Qualifications & ExperienceDegree-qualified or equivalent professional experience in:Control Systems EngineeringComputer ScienceAutomation EngineeringOperational Technology or related engineering disciplineProven, hands-on experience in Operational Technology (OT) environments, specifically:Physical build and configuration of industrial hardware systemsWindows OS installation, configuration, and hardening in industrial settingsExperience working directly with industrial HMI and control systems, such as:PCS 7AVEVA InTouchFactoryTalk OptixRockwell / Allen Bradley ControlLogixHighly Desirable ExperiencePractical experience with industrial cybersecurity standards, applied in live systems:IEC 62443NCSC Cyber Assessment Framework (CAF)EU Cyber Resilience ActFamiliarity with Sarda systems or similar industrial platformsExperience configuring and supporting industrial networksWorking knowledge of configuration and change management toolsA systems engineering mindset with a focus on continuous product improvementExperience supporting commissioning or field deployment activitiesWho This Role Is ForThis role is ideal for someone who:Has real-world OT engineering experience, not purely IT or governance-based cybersecurityEnjoys working hands-on with hardware, software, and industrial systemsUnderstands how cybersecurity is implemented practically in OT environmentsIs comfortable supporting systems from build through to commissioningCandidates whose experience is limited to desk-based IT, cyber compliance, or policy-focused roles without hands-on OT exposure are unlikely to be a fit for this position.