Job Description

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.

Amentum is a Lot 1 delivery partner within the Decommissioning and Nuclear Waste Partners (DNWP) Framework, a major Sellafield programme worth up to £4.6 billion and running for up to 15 years. The framework is focused on safely accelerating decommissioning, remediation and high‑hazard risk reduction across one of the most complex nuclear sites in the world.

Our nuclear team supports the front‑end design, engineering, technical leadership and delivery expertise required across the DNWP portfolio. We are looking for individuals with high‑value expertise from across regulated and comparable sectors to who can work collaboratively, embrace new challenges and contribute to the mission of safely and efficiently delivering Sellafield’s decommissioning and nuclear waste objectives.

About the Opportunity

As a Planner of Works (PoW) you will be responsible for the integration, maintenance and assurance of the construction programme in support of safe, compliant and efficient delivery of works on the Sellafield Site. The role ensures that construction activities are logically sequenced, risk informed, resource aligned, and compliant with Sellafield gated processes and site constraints.

You will report functionally into Project Management, work in close collaboration with Construction and Delivery teams and interface directly with Sellafield Ltd planning and assurance representatives as required.

The employee will be expected to contribute to the delivery of social value in line with the DNWP framework, supporting positive outcomes for local communities. Voluntary engagement is supported, with up to 16 hours per full‑time equivalent allocated.

Key Responsibilities:

• Maintain the construction programme in accordance with the approved scope, sequencing strategy and Sellafield gated process.

• Ensure programmes reflect constructability, access constraints, permits, safety case dependencies, and site logistics.

• Maintain the baseline programme, incorporating approved change where authorised.

• Integrate subcontractor and package level schedules into a coherent master programme.

• Support the Project / Delivery Manager in the production and maintenance of the Plan of Work.

• Maintain the master programme into near term plans, including Plan of the Week (PoTW).

• Validate that planned activities are achievable, fully scoped, and appropriately resourced.

• Identify and communicate programme risks, clashes, and constraints impacting planned works.

• Highlight critical path activities and key milestones to the project team.

• Collect progress data from site teams, Package Managers, and subcontractors.

• Produce look ahead schedules to support safe execution of works.

• Support assessment of change events and their impact on the programme.

• Assist in the development of mitigation and recovery plans where delays or constraints arise.

• Work with the Project Manager to test alternative sequences or delivery strategies.

• Support internal and client audits by providing programme evidence.

• Attend planning, progress, and coordination meetings as required.

Essential Skills & Experience:

• HNC or equivalent Level 4 qualification in discipline or construction.

• Significant experience within a construction role, working in a highly regulated and quality assured industry.

• Incorporated Engineer Status or Equivalent Professional Membership.

• Demonstrable experience in identifying and communicating programme risks, clashes, and constraints impacting planned works.

• Previous experience in production and maintenance of the Plan of Work and Plan of the Week.

• Demonstrable experience in assisting the development of mitigation and recovery plans where delays or constraints arise.

• Have previous experience in progress reporting and monitoring.

• Able to communicate information effectively at all levels and prepare clear and thorough reports and any other written information.

• Good stakeholder management skills.