Contract Opportunity: Principal Mechanical Engineer Location: North West (Hybrid - minimum 2 days per week in the office) Contract Length: 12 months (with strong likelihood of extension) Rate: £60 per hour (Outside IR35) Hours: 4-day week (Monday to Thursday, 10-hour days) We're seeking a highly experienced Principal Mechanical Engineer to take a leading role in delivering complex, safety-critical projects within the nuclear sector. This is an opportunity to drive technical excellence, mentor a talented engineering team, and contribute to major design programmes in a supportive and forward-thinking environment. Key Responsibilities: Provide technical leadership and oversight across all stages of mechanical design, from concept through to detailed design and delivery. Develop, review, and approve high-quality engineering documentation including specifications, calculations, drawings, and design justifications. Ensure designs comply with all relevant standards and legislation, including CE marking and the Machinery Directive. Lead and facilitate design reviews, HAZOPs, and risk assessments, ensuring design integrity and compliance. Oversee and support the work of Senior and Mechanical Engineers, providing mentorship and technical guidance. Liaise closely with project managers, safety specialists, and key stakeholders to ensure timely and effective technical delivery. Act as a key point of contact for techni...