Commissioning Engineer (Mech or Process)

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.

Energy Programmes is one of our newest Business Units and has been formed with the vision to support positive change and help shape the future of Nuclear Power. Our embedded teams are delivering support to Hinkley Point C (New build power station in the South West), Sizewell C (located in the South East), helping develop technologies in SMR (Small modular Reactor) capability and working towards building Poland's first Energy Power station.

Working in both client facing and internal roles we are delivering major programme and project management capabilities throughout the project lifecycle. We are driving to deliver safe, high quality and to time solutions by thinking innovatively and working collaboratively.

• Ownership of 2-3 radwaste systems, become an SME for those systems
• Develop commissioning documentation relating to commissioning testing and system validation activities
• Contribute to design reviews to ensure layout of plant items and systems are in a manner that allows ease of commissioning
• Assist in the detailed planning of commissioning activities and take ownership of a commissioning test program
• Take part in the execution of site commissioning activities to achieve successful and safe commissioning of HPC systems
• Analyse commissioning results and provide reports summarising the outcome of commissioning
• Ensure that the commissioning process adheres to nuclear, environmental, and industrial safety regulatory requirements, incorporating international best practices in safety and technical excellence
• Build successful collaborative relationships with project delivery team, site engineering, MEH and the plant operational organisation

• Degree qualified or equivalent such as HNC and/or relevant experience in a relevant engineering discipline
• Experience as a mechanical and or process commissioning engineer
• Experience of working in a highly regulated industry such as nuclear generation, utilities, oil & gas, or other heavy/manufacturing industries
• Baseline Knowledge of the EPR design or other PWR/ Power station designs
• Good technical background in process systems tests, including flushing, pump, and valve testing, etc
• Demonstrable history of working within safety and quality cultures
• Strong communication skills and the ability to convey complex information to others
• Knowledge of Radioactive Waste systems or fuel route processes
• Experience in commissioning, maintenance and/or operations of Nuclear Island and specifically Radwaste systems

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.