A unique place to grow your career

At Sellafield Ltd, we are harnessing our expertise; bringing together world-class skills and innovative technology to solve complex nuclear, infrastructure, and engineering challenges. By joining Sellafield Ltd, you join an amazing team of people, from all walks of life, where you can thrive in a connected, considerate culture of innovation, collaboration, and community; and play a significant part in the UK’s sustainable nuclear future.

Are you a technically minded problem solver who enjoys seeing projects through from concept to completion? Do you thrive on ensuring systems perform as expected and are ready for safe operation?

We’re seeking Commissioning Test Engineers to play a vital role in the testing, validation, and commissioning of new systems, equipment, and facilities. Acting as the final assurance before assets enter service, you’ll help confirm that systems operate safely, reliably, and in accordance with their design requirements.

Working as part of multidisciplinary project teams, you’ll coordinate and execute testing activities, identify and resolve technical issues, and provide confidence that facilities are ready for operational use.

About the role

As a Commissioning Test Engineer, you will be responsible for planning, coordinating, and delivering commissioning and testing activities across a range of projects. Your work will ensure that equipment and systems are thoroughly tested, documented, and proven before handover to operations.

This is an excellent opportunity for someone with a strong technical background who enjoys problem-solving, collaboration, and delivering high-quality engineering outcomes.

Every successful project depends on confidence that systems will perform safely and reliably when they are needed most. As a Commissioning Test Engineer, you’ll provide that confidence by ensuring facilities and equipment are thoroughly tested, verified, and ready for operation.

Your work will directly contribute to safer operations, reduced risk, improved performance, and the successful delivery of major projects. This is an opportunity to make a tangible impact while developing your technical expertise within a collaborative and professional engineering environment.

As part of the application process, you will be asked to provide evidence of your qualifications. Attaching them at application stage will ensure a smooth process and prevent delays.

Key responsibilities

Testing and Validation
• Develop and prepare commissioning test plans and procedures.
• Coordinate, conduct, and oversee testing activities on systems and equipment.
• Analyse, review, and document test results.
• Verify that systems meet required performance, operational, and safety standards.
• Support the successful progression of systems through commissioning and handover stages.

Technical Problem Solving
• Identify faults, defects, or unexpected behaviours during testing.
• Investigate root causes and recommend effective corrective actions.
• Work with project and engineering teams to implement improvements and resolve technical issues.
• Contribute to the optimisation of systems and processes throughout the commissioning lifecycle.

Project Coordination and Stakeholder Engagement
• Coordinate the personnel, equipment, and resources required to deliver testing activities.
• Work closely with engineers, operations personnel, project teams, contractors, and other stakeholders.
• Provide technical advice and support throughout commissioning programmes.
• Review procedures and instructions to ensure they are practical, accurate, and fit for purpose.

Quality, Compliance and Continuous Improvement
• Maintain accurate commissioning records, reports, and documentation.
• Ensure all commissioning activities are completed in accordance with company standards, procedures, and regulatory requirements.
• Capture and share lessons learned to support continuous improvement.
• Promote high standards of safety, quality, and professional conduct.

Your Skills and Qualifications

We’re looking for someone who enjoys understanding how systems work and takes pride in ensuring they’re fit for purpose before entering service.
You’ll be someone who:
• Takes ownership of their work and delivers results to a high standard.
• Communicates confidently with a variety of technical and non-technical stakeholders. • Builds effective working relationships across multidisciplinary teams.
• Is organised, methodical, and detail-oriented.
• Enjoys troubleshooting and solving complex technical challenges.
• Produces clear, accurate, and professional technical documentation.
• Maintains a strong focus on safety, quality, and operational excellence.

Essential Qualifications and Experience
You should hold:
• A Level 3 qualification supported by significant relevant experience; or
• Incorporated Engineer (IEng) status; or
• HND or equivalent level 5 in relevant technical subject.

You should also have:
• Experience working within an engineering, technical, maintenance, commissioning, or operational environment.
• Strong analytical and problem-solving skills.
• The ability to work effectively both independently and as part of a team.
• Experience interpreting technical information and documentation.
• Good written and verbal communication skills.

Desirable Experience
• Experience in commissioning, testing, validation, or system acceptance activities.
• Experience supporting facility start-up, operational readiness, or system handover.
• Knowledge of troubleshooting methodologies and fault-finding techniques.
• Experience working within highly regulated or safety-critical environments.

Please attach evidence of your qualifications when submitting your application for this role.

Please note: As a minimum, SC security clearance is required for these roles with the possibility of DV clearance being required in some areas. The roles are full-time, part-time working is not available.

Why us?

At Sellafield Ltd, we are committed to supporting our employees in fulfilling their potential. With 100 years of work in front of us, we offer comprehensive training and development opportunities, enabling you to feel inspired in your role. Whatever area you join us in, you’ll find a genuinely exciting and rewarding career.

Making sure our employees feel supported is important to us. Therefore, to help you get the most out of life in and outside of work, we also offer a range of employee benefits:
• You will benefit from an annual bonus of up to 10% – 15%, made up of company and personal performance
• An attractive defined contribution pension scheme – the company will match up to 13.5% for a 7%
employee contribution!
• 30 days annual leave + bank holidays. Plus, the ability to purchase an extra 2.5 days per year.
• The ability to carry over 10 days annual leave each financial year
• Paid Sick Leave
• Family Friendly Policies – Visit our Rewards & Benefits page to read more
• Cycle to Work Scheme
• Lifestyle Benefits sasra.co.uk
• Learning & Development Opportunities https://careers.sellafieldsite.co.uk/work-with-us/learning-anddevelopment/
• Reward & Recognition Policies
• Welfare & Employee Assistance Programme
• Free Aviva Health App & Annual Health Check
• MyDiscounts – Employee Savings & Discounts
• MyBenefits – A Charity Giving Scheme
• Many, many more! Click this link to visit our Rewards & Benefits page:
https://careers.sellafieldsite.co.uk/work-with-us/rewards-and-benefits/

Additional Information

• The closing date for this vacancy is 9th November 2026

• In the event of a high number of responses to any advert, Sellafield Ltd reserves the right to close the advert early. Once closed, the advert will be removed from our website. We encourage you to submit your application as soon as possible to avoid disappointment.

• Please regularly check your Spam/Junk folders for news about this vacancy, correspondence could contain invitations to interview and other important updates.

• Qualifications
As part of the application process, you will be asked to provide evidence of your qualifications. Attaching them at application stage will ensure a smooth process and prevent delays.

• Right to Work in the UK
As part of our screening process, all candidates must demonstrate their right to work in the UK.
If you are not a UK national, you will be required to provide evidence of your immigration status. This is generated through the UK Government online service via the GOV.UK services below:
- A valid eVisa (digital immigration status) share code
https://www.gov.uk/evisa/view-evisa-get-share-code-prove-immigration-status
- A Right to Work share code
https://www.gov.uk/prove-right-to-work

Applicants who are not UK nationals must provide a valid Right to Work share code and evidence of their eVisa status at the point of application. Applications submitted without this information are not able to be progressed.

• Please be aware that this role is subject to achieving security clearance. This role requires higher level of National Security Vetting where applicants must typically have 5 or 10 years of continuous residency in the UK. Factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the level of clearance you’re able to achieve.

• Sellafield Ltd are recognised as a Disability Confident Employer (Level 3). Disability Confident employers offer an interview to disabled applicants that meet the minimum criteria for a vacancy. Sellafield Ltd define the minimum criteria as the ‘essential skills’ which are listed on the vacancy notice. Whilst completing your application form, you will be able to indicate if you wish to be considered under the disability confident scheme. If you would prefer to discuss this directly with us, please contact the GBS Recruitment team on recruitment@sellafieldcloud.co.uk