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

Have you had Commissioning Engineer experience?

Energy Power Programmes are delivering client critical works to some of our major UK and European Projects. 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.

Amentum are currently recruiting a Commissioning Engineer (Software Developer). The primary purpose of this role is to develop, configure, test, and troubleshoot software that supports I&C system commissioning activities across HPC’s reactor units. This includes developing robust, scalable software solutions using Python, JavaScript, and PostgreSQL.

The Software Developer contributes throughout the development lifecycle—from requirement gathering and technical design to implementation, testing, deployment, and ongoing optimisation. Key responsibilities will be:

• Design technical solutions to support I&C commissioning engineers, simplifying the use and interpretation of I&C data.
• Improve and maintain web-based applications.
• Implement backend logic, data processing workflows, and automation solutions using Python.
• Build responsive, user-friendly frontend components and interactive features using JavaScript (with Angular JS Framework).
• Design, manage, and optimise relational databases in PostgreSQL.
• Write performant SQL queries, stored procedures, and data migration scripts.
• Ensure data integrity and security across environments.
• Ensure software quality by testing and writing documentation.
• Conduct unit testing, integration testing, and assist in user acceptance testing.
• Write technical specifications and installation procedures and assist in writing user manuals.
• Debug, troubleshoot, and resolve software defects across the stack.
• Deploy and maintain these tools and collaborate with cybersecurity team.
• Ensuring high standards of security, performance, and scalability across all developed solutions.
• Contribute to the continuous improvement of development practices and code quality standards.

Knowledge, Skills, Qualifications & Experience

• Proven experience developing web applications.
• Strong proficiency in Python and at least one major Python framework (FastAPI, Flask, Django).
• Strong knowledge of JavaScript and common front-end libraries (ideally Angular).
• Solid understanding of SQL database : modelling, query optimisation, and performance tuning.
• Decision making ability for resolution of issues.
• Proactive, adaptable, and eager to learn new technologies.
• The ability to innovate, think laterally and implement processes.

Desirable

• Degree in software development.
• Experience with containerisation technologies such as Docker.
• Familiarity with cloud platforms (AWS, Azure, GCP) or on premises hosting environments

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 www.vercida.com 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.