Senior EC&I Engineer

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive.

Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all. We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent. In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

About The Opportunity

Amentum is the Design and Engineering partner for Sellafield under the PPP (Programme and Project Partners). This is a 20-year arrangement to deliver ~£7bn of major projects. We are looking to recruit high value expertise from across regulated and comparable sectors to work in a collaborative environment. PPP is delivering major projects, site wide improvements and provision of supporting services.

The Projec t

The SIXEP Continuity Plant, being delivered by the Programme and Project Partners (PPP) at Sellafield, will ensure the site's existing Site Ion Exchange Effluent Plant (SIXEP) facility can continue its vital work for decades to come. The newbuild SCP facility will play a vital part in Sellafield's purpose to create a clean and safe environment for future generations.

The Role

SCP now has an exciting opportunity to recruit a Senior EC&I Engineer to join the team in Westlakes, Cumbria.

As a Senior EC&I Engineer your responsibilities could include:

• Leading EC&I design activities across multiple project phases including detailed design, procurement, manufacture, installation, and commissioning.
• Managing and developing the EC&I design configuration baseline in response to evolving project requirements, ensuring robust change control.
• Producing, reviewing, and approving EC&I design deliverables to programme deadlines and ensuring compliance with all relevant standards, codes, legislation, and client engineering requirements.
• Providing technical oversight of the EC&I supply chain, including resolution of complex Technical Queries, design assurance reviews, approval of supplier deliverables, and support to Factory Acceptance Testing and Site Acceptance Testing.
• Coordinating EC&I system integration with multidisciplinary engineering teams through BIM, interface management and formal design reviews.
• Supporting development of junior engineers and providing technical guidance across the EC&I discipline.
• Ensuring the EC&I design intent is fully aligned with nuclear and conventional safety requirements, and that all functional, performance, and safety-critical requirements are met through appropriate Validation and Verification processes.
• Contributing to project planning, risk assessments, design substantiation, and assurance activities.

As a Senior EC&I Engineer you will have:

• BEng/MEng degree in a relevant discipline, or demonstrable equivalent experience with an HNC/HND. - Chartered or Incorporated Engineer status (or working towards chartership).
• Significant experience delivering EC&I design within complex, highly regulated industries; nuclear sector experience is highly desirable.
• Demonstrable technical responsibility in producing and validating EC&I design deliverables and substantiation documents.
• Strong understanding of relevant UK legislation, design codes, and industry good practice for EC&I engineering.
• Proficiency with relevant CAE and modelling tools (e.g., Autodesk AutoCAD, BIM/3D modelling platforms). - Proven ability to mentor junior engineers and contribute to competency development within the discipline.

Our Culture

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.

We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.