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.