Developer job at Sellafield Full Time

Blend personal growth and professional development with purposeful work

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.

The challenges we face are amongst the most complex anywhere in the world. We are using advanced technologies to shape, create and advance the world’s nuclear decommissioning knowledge and capability. That’s why our work is driven by people with a passion for problem-solving and innovation.

About the role

Developers are responsible for designing, developing, and implementing innovative software solutions (both on-prem and cloud) that meet our strategic business needs. Role-holders require strong technical expertise, an ability to work effectively in teams, and a commitment to continuous improvement to deliver secure and scalable solutions that help Sellafield Ltd realise its digital ambition.

Key responsibilities

• Support the delivery of digital products across ISO/ICT and Sellafield Ltd by developing software components and writing clean, secure, and well-tested code, to provide quality solutions.
• Proactively manage service components in line with key performance indicators (KPIs), supporting service availability and capacity management as well as the identification and resolution of service faults.
• Optimise development processes by analysing existing workflows, identifying improvements, and supporting their implementation.
• Design, review, and support the quality assurance of software solutions to ensure they effectively mitigate security threats.
• Apply modern development technique and standards to the delivery of all software solutions and encourage adherence to them among other developers.
• Use a variety of prototyping methods, sharing best practice and supporting other developers in their application, while considering the strategic end-to-end design of services.
• Design systems in line with architectural principles, policies and organisational standards. This may also include supporting their implementation and procurement.
• Support systems integration by defining the integration build, coordinating build activities across systems, and participating in testing.
• Support engagement with the Digital Exploitation team to understand customer needs and translate them into user stories. This includes identifying appropriate tools and methods to prioritise user stories and clearly articulating the distinction between user needs and desires.

Your Skills and Qualifications:

• A degree or equivalent experience in a relevant field, such as Computer Science.
• Proven experience or acumen as a Developer.
• Strong understanding of agile software development methodologies.
• Proficient with Test Strategies, Test Frameworks, and Test Automation.
• Excellent problem solving and analytical skills.
• Strong interpersonal skills, demonstrating ability to work in teams and collaborate effectively.

Skills Considered Desirable:

• Able to lead and mentor junior developers.
• Experience working in a highly regulated environment.
• Understanding of Sellafield Ltd, including its operations and ICT estate or equivalent.

Why us?

At Sellafield Ltd, we are committed to supporting our employees in fulfilling their potential. With having 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%, 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. There is also the ability to purchase 2.5 additional days.
• 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-and-development/
• 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 Sunday 14th June 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.

• 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.

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

• 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.