Do you have proven experience as a Principal or Senior Heating, Ventilation & Air Conditioning Engineer? Do you thrive in a multidisciplinary environment where your HVAC expertise directly shapes nuclear and industrial innovation? Are you looking for a new assignment with a company that values technical leadership, real responsibility, and meaningful impact? If so, this could be the opportunity for you! The Opportunity An opportunity is available for a highly experienced Principal/Senior HVAC Engineer to support a major nuclear project. The assignment will be based in Stockton-on-Tees and hybrid working is available based around a working week of 40 hours. Rate will be dependent on experience due to the potential for candidates of different levels of seniority to apply. The role will support the HVAC Capability team in all aspects of HVAC and Building Services, preferably with knowledge and experience in nuclear standards and processes, specifically the delivery of the design of HVAC Systems or modification to existing HVAC Systems. Your duties and responsibilities: * Ability to be client facing and demonstrate confidence as a subject matter expert, hence able to support all stakeholders. * Manage a small team of engineer/designers * Design of Ventilation systems from basic principles and an understanding of containment philosophy * Production of HVAC system design deliverables, specifying heat rejection plant (eg. air / water coo...