The Balance of Plant Commissioning Engineer will work on the NNB HPC project at Hinkley Point C, Sizewell C, and other sites. In the early stages you will contribute to detailed planning and preparation, including reviewing contractor‑produced commissioning documentation. You will then execute commissioning tests, conduct surveillance on contractor‑led activities, analyze results, and justify the readiness of HPC units for commercial operation. The role also involves delivering test specifications and safety documentation, performing site testing, resolving problems, ensuring timely delivery of deliverables, and supporting contract partners in review and acceptance activities.