Senior/Lead Commissioning Engineer 75k - 85k UK based travel Responsibilities: Lead the commissioning and testing of high-voltage systems, ensuring all works are completed safely, efficiently, and in compliance with client and industry standards. Act as the technical authority on HV testing and commissioning activities - providing expert guidance on complex protection, control, and HV equipment systems. Plan, execute, and document pre-commissioning and commissioning phases for substations, transformers, switchgear, and protection systems. Oversee system energisation and handover, ensuring the delivery of a fully tested, operational, and compliant installation ready for client acceptance. Conduct and interpret advanced HV testing, including: Primary and secondary injection testing of protection relays Contact resistance (Ductor) and insulation resistance tests AC dielectric withstand tests CT/VT ratio, polarity, and burden checks End-to-end scheme verification and functional testing Transformer ratio, winding resistance, and polarity tests Provide technical input during FAT, SAT, and site commissioning - identifying design or installation issues early and implementing robust corrective actions. Ensure all test results, commissioning schedules, and handover documentation are accurately maintained, signed off, and issued in accordance with project requirements. Champion safety excellence on site by maintaining and enforcing rig...