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