Job title: Principal Mechanical Engineer – PNED Location: Barrow-in-Furness. We offer a range of hybrid and flexible working arrangements – please speak to your recruiter about the options for this role Salary: £45,628 – £57,500 dependent on experience What you’ll be doing: * Collaborate closely with the build organisation, providing engineering support to ensure the final product aligns with original design intent * Demonstrate a strong understanding of key requirements and critical dimensions related to major structural components * Lead the assessment and implementation of design changes impacting primary structural elements, whether driven by emergent issues, continuous improvement, or process updates * Support, or where appropriate, serve as the engineering representative within test and authorisation groups * Develop specialised knowledge of the unique build sequence of the Reactor Compartment Unit and deliver ongoing engineering support throughout construction * Represent the engineering function during the planning and execution of major construction milestones within the Reactor Compartment Unit’s scope * Investigate and present robust technical solutions to challenges encountered during the construction of the Naval Reactor Plant * Provide well-reasoned technical recommendations to key stakeholders, including Rolls-Royce and the Ministry of Defence, to support or constructively challenge existing requirements Your skills and experiences: Essential: * Degree-level qualification in Engineering, preferably with a focus on Mechanical or Structural disciplines * Proficient in interpreting mechanical drawings, with a solid understanding of geometric dimensioning and tolerancing (GD&T) * Familiarity with welding engineering principles and non-destructive examination (NDE) techniques * Strong technical report writing skills, with experience in producing clear justifications for design changes Desirable: * Understanding of stress, fatigue, and thermal analysis principles in engineering applications * Awareness of nuclear radiation shielding requirements and best practices * Prior experience working within a nuclear plant environment * Knowledge of the nuclear industry, including familiarity with regulatory bodies and compliance standards Benefits: You’ll receive benefits including a competitive pension scheme, enhanced annual leave incentive and a Company contributed Share Incentive Plan. You’ll also have access to additional benefits such as flexible working, an employee assistance programme, Cycle2work and employee discounts – you may also be eligible for an annual incentive. The Platform Nuclear Engineering Department team: As a Principal Mechanical Engineer – PNED, you will play a critical role in supporting the design, build, and test phases of the Naval Reactor Plant (NRP) across multiple programmes, ensuring alignments with the original design intent. This includes leading the resolution of complex technical issues encountered during construction and testing, with a focus on developing robust engineering solutions and maintaining the integrity of the supporting safety case. You will provide expert guidance to internal teams including Engineering Delivery, Test & Commissioning, Operations, and Project Management. Additionally, you will represent the business in collaboration with key external stakeholders, including the Ministry of Defence (MoD) and Rolls-Royce Power, ensuring effective coordination across the wider enterprise. We offer relocation support across all Submarine roles, subject to meeting eligibility criteria