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 and diverse 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 

The Decommissioning Alliance (TDA) is a strategic partnership, operating within the DNWP framework and delivering critical decommissioning work at Sellafield, including the UK’s most challenging Legacy Ponds facilities. As a key partner within DNWP, TDA contributes to Sellafield Ltd.’s mission while ensuring communities, supply chains, and stakeholders benefit from meaningful, measurable Social Value outcomes.

Due to continued growth, an opportunity has arisen for a Senior Planning Engineer to join the TDA planning team. This is an exciting opportunity to become part of an established team working on a long-term framework at Sellafield. This role offers the chance to work in a dynamic and forward-thinking environment to deliver projects of national importance. The successful candidate will work closely with Project Managers, multi-disciplinary project teams, and the Client on a diverse portfolio of challenging projects. 

Key Responsibilities 

• Develop, update and maintain full lifecycle project schedules in Primavera P6, ensuring accuracy and alignment with project objectives and delivery targets. 

• Update and maintain Programme-level tactical/delivery plans. 

• Work closely with Project Managers to support project forecasting, progress reporting, and scenario planning for change requests. 

• Generate resource profiles to support the efficient deployment of project resources. 

• Produce and interpret earned value management (EVM) metrics (including performance analysis and variance reporting), critical path analysis and float erosion outputs. 

• Ensure programmes comply with NEC 3/4 contract requirements and utilise CEMAR for contract management activities. 

• Attend regular progress meetings to capture schedule updates and to provide clear insight on programme performance and critical path impacts. 

• Mentoring and development of junior members of the planning team. 

Here's What You'll Need: 

• Good experience in a project planning role within engineering, construction, or nuclear sectors. 

• Strong working knowledge of Primavera P6 and other planning methodologies. 

• Proficient in creating detailed costed & resourced schedules, progress updates, and performance analytics. 

• Strong experience of planning projects on Fixed Price and/or Target Cost NEC Contracts. 

• Experience of producing and maintaining risked, P50/P80 underpinning schedules. 

• A positive can-do attitude, excellent communication and collaboration skills with the ability to work effectively across diverse project teams. 

• Must hold appropriate Security Clearance and be able to obtain Sellafield clearance. 

Desirable Skills 

• Experience of working on projects on Sellafield site. 

• Experience with IWM (Integrated Work Management) is desirable. 

Our Culture

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.  

We aim to embed inclusion in everything we do. We know that if we are inclusive, we’re more connected, and we’re more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you’re pregnant or on family leave. This is reflected in our wide range of Global Employee Networks.

We partner with VERCIDA to help us attract and retain diverse talent. 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.

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