Principal ECandI Engineer - Major Regulated Projects (Nuclear Sector) Overview A leading global engineering consultancy is seeking a highly experienced Principal ECandI Engineer to support a portfolio of major nuclear projects (MR projects). This is a senior technical role suited to someone who thrives in complex, highly regulated environments and enjoys driving engineering excellence across multidisciplinary teams.Key Responsibilities Lead the delivery of ECandI engineering design, analysis, and documentation across major nuclear projects.Provide technical authority and oversight for ECandI systems, ensuring compliance with industry standards, regulatory requirements, and project specifications.Develop and review design packages, including calculations, schematics, block diagrams, cable routing, safety systems, and control philosophies.Act as a subject-matter expert for nuclear safety-related ECandI systems, supporting HAZOPs, design reviews, and safety case development.Collaborate closely with project managers, systems engineers, and other discipline leads to ensure integrated, high-quality engineering solutions.Mentor and guide junior and mid-level engineers, promoting best practice and technical development within the team.Engage with clients, stakeholders, and regulatory bodies to present designs, resolve technical queries, and support project delivery.Contribute to continuous improvement initiatives, innovation, and the development of engineering standards and processe