Senior Mechanical Designer - PFDO Project (Sellafield) Contract | £35-£42/hour (Inside IR35) Warrington | Hybrid - 3 days on site / 2 days remote Sector: Nuclear | PFDO Programme Are you an experienced Senior Mechanical Designer looking to contribute to one of Sellafield's high-profile decommissioning projects? This is a hands-on role supporting the PFDO (Post-Fuel Decommissioning Operations) project, delivering high-quality mechanical designs and technical drawings for safety-critical systems. You'll work within a collaborative engineering team, supporting design development, technical documentation, and integration with wider project disciplines. The role offers a hybrid working arrangement, with three days per week in Warrington for team collaboration and site engagement. Key Responsibilities Develop and produce mechanical designs, layouts, and technical drawings for PFDO systems Review and update existing designs to meet project requirements and standards Ensure designs comply with Sellafield design processes, safety requirements, and engineering standards Collaborate with multi-discipline teams, including CE&I, structural, and project engineering colleagues Support the preparation of technical documentation, specifications, and design packages Mentor and provide guidance to junior designers where required Requirements Proven experience as a Mechanical Designer within nuclear or highly regulated sectors Strong knowledge of mechanical design principles, CAD tools (e.g., AutoCAD, SolidWorks, or MicroStation) Understanding of nuclear design standards, site procedures, and safety requirements Ability to produce clear, accurate, and compliant technical drawings and documentation Good communication and collaboration skills SC clearance preferred or the ability to obtain Why Join? Competitive £35-£42/hour (Inside IR35) Hybrid working - balance of 3 days in Warrington and 2 days remote Work on a nationally significant nuclear decommissioning programme Opportunity to influence mechanical design solutions in a complex, safety-critical environment Join an experienced, collaborative team with strong technical leadership Apply now to bring your mechanical design expertise to the PFDO project at Sellafield and contribute to one of the UK's most important nuclear programmes