Industrial Relations Advisor

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

We are seeking a confident and experienced Industrial Relations Advisor to support the delivery of effective Industrial and Employee Relations across Sellafield's operational and project environments.

This is a role for someone who enjoys being at the heart of the business, building relationships, resolving issues, and working closely with managers, trade unions, contractors and Joint Venture partners. You'll be a visible presence across the site, providing practical advice and support that helps maintain a positive industrial relations climate in a highly regulated and unionised environment.

This is not a strategic HR role. We are looking for a proactive, credible practitioner who can roll their sleeves up, engage with stakeholders at all levels, and deliver outcomes.

Roles & Responsibilities:

• Providing day-to-day Industrial Relations and Employee Relations support across Operations and Project delivery organisations within our craft delivery.
• Building and maintaining effective working relationships with recognised Trade Union representatives.
• Supporting managers with disciplinary, grievance, conduct, attendance and capability matters for our NAECI and CIJC employees.
• Attending and supporting consultation meetings, hearings and employee engagement forums.
• Working collaboratively across with Joint Ventures and Major Projects, with other contractor organisations to manage workforce issues and maintain productive working relationships.
• Providing practical advice on the application of site agreements, policies and procedures.
• Supporting organisational change, project mobilisation and workforce interventions where industrial relations considerations are critical.
• Identifying emerging workforce issues and resolving concerns before they escalate.

Qualifications & Experience:

• Previous experience working within the Sellafield environment ideally including a sound knowledge of NAECI and CIJC.
• Strong knowledge and practical experience of Industrial Relations and Employee Relations.
• Experience working within a highly unionised environment and engaging directly with Trade Union representatives.
• Experience supporting operational teams and/or major project delivery organisations.
• Strong communication, influencing and relationship-building skills.
• Ability to work effectively across multiple stakeholders, including contractors, Joint Ventures and supply chain partners.
• A pragmatic, resilient and solutions-focused approach.

What success looks like

You'll be known as a trusted advisor who can successfully operate across complex stakeholder groups, build credibility with unions and management alike, and help create a stable and productive industrial relations environment that supports both operational delivery and major project success.

Who this role will suit

We're looking for a doer-someone who is confident, approachable and comfortable having honest conversations in challenging situations. You'll enjoy being visible, building relationships across the workforce, and working in a fast-paced environment where no two days are the same.

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