Senior EC&I Design Engineer

Senior / Principal CE&I Design Engineer - Silos MSSS SEP1&2 Sellafield Site (3 days/week on plant) | West Cumbria Design Office | Monthly Warrington visit Up to £80/hour (Inside IR35) | SC Clearance required | An opportunity has arisen for a Senior or Principal CE&I Design Engineer to join the Silos MSSS SEP1&2 CE&I design team, supporting one of the UK's most complex and safety-critical nuclear environments at Sellafield. This role is central to providing front-line, site-based design support to Commissioning teams, ensuring that detailed CE&I designs and changes are delivered, reviewed, and verified to meet stringent functional and business requirements. You will play a key role in shaping safe, compliant, and buildable engineering solutions-while delivery and commissioning execution is handled by dedicated site teams. Key Responsibilities Provide site-based CE&I design support to commissioning activities on MSSS plant (SEP1 & SEP2) Deliver and/or check detailed CE&I designs and modifications Support and guide delivery of engineering outputs across multidisciplinary teams Ensure compliance with relevant external standards, including: PES-based control systems Process instrumentation standards Work closely with commissioning and site delivery teams to resolve technical issues in real time Contribute to design assurance and technical governance Mentor and support early career engineers where appropriate Essential Requirements Minimum HND in a relevant engineering discipline Incorporated Engineer (IEng) status (minimum) Current SC Clearance Minimum 5 years' experience as a CE&I Senior Design Engineer Proven experience in: External multidisciplinary projects Site-based front-line design support to commissioning teams Delivery and checking of detailed CE&I designs/changes Strong understanding of: PES-based control systems Process instrumentation Strong communication, problem-solving, and stakeholder engagement skills Willingness to support and mentor junior engineers Desirable Experience 7+ years' experience in CE&I senior design roles Experience across Sellafield Ltd or similar regulated nuclear environments Familiarity with internal SL engineering standards Exposure to complex, multi-stakeholder infrastructure projects Working Pattern Minimum 3 days per week on the MSSS plant at Sellafield When off-plant: West Cumbria-based design office Approx. 1 day per month at Hinton House, Warrington Hinton House Warrington 37 hours over a 4.5-day working week Why Apply? This is a high-impact role within a nationally significant nuclear programme, offering the chance to directly influence safe design delivery in a live commissioning environment. Ideal for engineers who enjoy being close to the plant, solving real-time technical challenges, and shaping design outcomes at execution level