Mechanical Commissioning Technician – Major UK Infrastructure Project Location: Cumbria Contract: 4 months (Likely extension thereafter) Rate: Negotiable (DOE) Sector: Nuclear Decommissioning & Clean Energy A nationally significant environmental engineering programme is seeking a Mechanical Commissioning Technician to join the team delivering one of the UK’s most complex and important infrastructure projects. This long-term decommissioning initiative will ensure the safe processing and storage of legacy materials, supporting environmental protection for decades to come. Working closely with the Commissioning Engineer, you will play a hands-on role in preparing, testing, and bringing mechanical systems into operation. This includes process systems, vessels, pumps, and associated plant equipment. Key Responsibilities: Maintain safety as the highest priority, following nuclear, radiological, conventional, and environmental safety procedures. Carry out mechanical commissioning and testing activities across all project stages. Support the preparation of commissioning test documentation. Assist in implementing and tracking First-Off Builds (FOBs) and Technical Queries (TQs). Perform testing activities for third-party witnessing. Apply and remove Temporary Commissioning Aids as required. Record commissioning data in line with project requirements. Use completions management systems to track commissioning progress and handovers. Collaborate with multidisciplinary engineering teams and contribute to design reviews.Skills & Experience Required: Time-served or equivalent qualification in a mechanical discipline (e.g., piping, process equipment, or similar). ONC or equivalent (or working towards qualification). Proven experience in project commissioning within mechanical systems. IOSH Working Safely (or equivalent). Relevant trade card. Proficiency with Microsoft Office Suite. Ability to meet client security requirements (BPSS, P4 pass).This role offers the chance to be part of a landmark UK infrastructure programme, applying your mechanical expertise in a challenging and rewarding environment. If you are interested and keen to find out more, please apply now with your updated CV and reach out to Tom Johnson at Certain Advantage