Sellafield Group Director

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.

About the Opportunity

The Group Director provides strategic and operational leadership for the whole Sellafield Account ensuring delivery excellence, customer satisfaction, and sustainable business growth. This role oversees all operational performance, governance, people development, and senior client engagement to ensure Amentum’s strategic objectives are met. The role will work across multiple contracts, focusing on portfolio-wide improvements, efficiency gains and value creation.

You'll be accountable for driving efficiency, embedding a culture of innovation and inclusion, and ensuring that all the projects and frameworks within the portfolio have the systems, processes, and leadership needed to deliver consistent high performance. The Group Director will contribute to strategic decision-making, collaborate cross-functionally, and play a key role in shaping the organisation’s growth, mission, and culture.

This role will help the organization realize its ambition to become a trusted partner and advisor, co-creating solutions with our key client that align with both our mutual and shared strategic objectives. The role ensures that we operate as an integrated and innovative delivery partner, fostering a culture of continuous improvement and maximizing value for the client and the organisation alike.

Scope & Impact

Business-wide accountability for all Amentum activity at Sellafield.

Executive-level influence with Sellafield Ltd, NDA, regulators, and Amentum leadership.

Ownership of long-term account value, risk profile, and reputation.

Key Responsibilities

Strategic Portfolio Leadership : Oversee a portfolio of projects and frameworks, identifying and implementing opportunities to deliver more efficiently and create additional billable value, maximising gross margin.

Client Relationship Management : Build and maintain deep, trust-based relationships with senior Sellafield Executives, aligning our services with client strategic objectives and ensuring a no-surprises, open-communication culture.

Co-Created Value Propositions : Develop value propositions based on solutions co-created with our key client, ensuring alignment with both mutual and shared strategic objectives to drive additional value for both parties.

Portfolio Optimization : Implement portfolio-wide initiatives, such as master resource scheduling, digital delivery, supply chain engagement, and staff development, to drive operational efficiencies and innovation.

Best Practice & Consistency : Establish and implement best practices across the portfolio, aligning with strategic goals in areas like environmental sustainability, social impact, and digital innovation.

Threat and Opportunity Management : Lead a structured process to review portfolio-wide risks and opportunities, ensuring alignment from top-down and bottom-up communications with individual framework teams.

Performance Reporting : Prepare regular reports and presentations for senior leadership, updating on improvement actions, benefits realisation, and a balanced scorecard of meaningful metrics.

Team Leadership & Development : Lead, align, and performance-manage Portfolio Directors, Programme Directors, and Contract Leads as a cohesive senior leadership team, ensuring clarity of accountability, collaboration across Divisions, and succession depth.

Compliance & Governance : Ensure transparent, ethical operations and adherence to corporate governance, risk, and compliance standards.

Health, Safety & Wellbeing : Promote the highest standards of safety, wellbeing, and ethical responsibility across all operations. Set clear expectations for nuclear safety culture, security, and regulatory engagement at enterprise level, reinforcing Amentum standards across all contributing teams and partners.

Partnerships : Own and govern Joint Venture and strategic partnership arrangements associated with the Sellafield account, including chairing or appointing Chairs, SROs, and senior accountable roles where required.

Financial Management : Deliver strong performance across revenue, margin, cost management, and cash flow to achieve year-on-year growth.

Here's What You'll Need

Qualifications & Experience

Degree in Business, Management, Finance, or related field; advanced degree ( MBA) preferred.

Significant senior leadership experience within complex, project-driven organisations.

Proven track record of growing revenue and profitability through strong customer delivery.

Experience managing large cross-functional teams and embedding governance frameworks.

Financial acumen and experience in strategic planning and delivery.

Demonstrated success in building enduring client and stakeholder relationships.

Key Competencies & Skills

Networking & Relationship Building : Excellent ability to engage and manage internal and external stakeholders, including senior clients and framework leaders.

Influential Leadership : Strong presence and the ability to influence decision-making across diverse teams, cutting through individual agendas to drive a "best for Amentum” mindset.

Collaboration & Communication : Naturally collaborative, with strong communication skills to foster an environment of open dialogue.

Commercial Creativity : Proven ability to think commercially and creatively, identifying new opportunities for delivering value and improving financial performance.

Change & Portfolio Management : Expertise in transformational change, portfolio management, and the ability to oversee multiple complex projects across different frameworks.

Outcome-Focused : Focus on delivering tangible outcomes, including efficiency gains, cost savings, and enhanced margins for the client.

Key Performance Indicators (KPIs).

Cost Efficiencies : Achieving measurable cost savings through operational efficiencies and streamlined processes.

Margin Growth : Increasing portfolio gross margins by at least 3% (with a 5% stretch target), through delivering additional value and innovative solutions.

Client Satisfaction : Strengthening the client relationship and maintaining high levels of satisfaction through aligned strategic objectives and trusted partnership.

Behaviours

Relationship‑Focused : Builds strong, trust‑based relationships that enable effective collaboration and long‑term organisational success.

A Live Listener : Actively listens to understand and uses insights to drive better decisions and stronger alignment.

Empathetic : Leads with emotional intelligence, creating a supportive and inclusive environment where people thrive.

Curious : Seeks to understand people, systems, and trends, continuously learning to improve leadership and outcomes.

Adaptable : Navigates change with agility and composure, adjusting approach while maintaining clarity of direction.

Resilient : Maintains focus and performance under pressure, turning challenges into opportunities for growth.

Authentic : Acts with integrity and transparency, building trust through consistent values‑driven leadership.

Innovative : Challenges the status quo and translates creative ideas into impactful solutions.

Limitless Mentality : Thinks beyond constraints, inspiring bold ambition and a culture of possibility.

Strategic : Connects insights into a clear long‑term vision, guiding decisions that shape sustainable success.

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 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.