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 looking for a HR People Operations Partner to provide a high quality and effective HR Generalist service to the Amentum site delivery team based at Sellafield, covering all areas of HR delivery including, employee relations, industrial relations (with support from Industrial Relations Manager), trade union engagement, onboarding, performance management and pastoral care.
The HR People Operations Partner provides first line HR advice to Amentum managers and staff based on the Sellafield site.
Key Responsibilities:
Work with Amentum managers advising and coaching on all Amentum HR issues including workforce planning, disciplinary and grievance, performance management, absence management, compensation and benefits, mobilisation and demobilisation etc.
Building and retaining an understanding of the project people policies and processes and how they interact with the Amentum HR policies and processes.
Responsible for communication to Amentum staff of Amentum HR policies, procedures & processes. Facilitate understanding and use of Amentum HR policies and processes.
Develop efficient and effective working relationships with the Sellafield projects management and their teams, including joint venture partners where they exist.
Build and maintain relationship with Amentum Industrial Relations Manager to ensure compliance with National Working Agreements for craft workforce.
Develop and maintain effective working relationships with Trade Union officials/stewards and reps including attendance at regular meetings.
Regular attendance is required at the Sellafield site to ensure effective working relationships with Supervisors/ People Leaders along with face-to-face support for Craft employees based on site.
Attendance at base office location may be required from time to time also.
Requirements
Experience of supporting a diverse team, preferably in a large infrastructure Project or Programme Environment.
Capable of handling simultaneous requests for support.
Experience of working in a HR role, advising on people issues in a multi-disciplinary and unionised environment, including a significant Craft workforce.
Ability to develop and maintain effective working relationships with trade unions.
This is a hybrid role with regular attendance required to the Sellafield site.
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.
Compensation Details:
GBP
The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.
Benefits Overview:
Our health and welfare benefits are designed to support you and your priorities. Offerings include:
Health, dental, and vision insurance
Paid time off and holidays
Retirement benefits (including 401(k) matching)
Educational reimbursement
Parental leave
Employee stock purchase plan
Tax-saving options
Disability and life insurance
Pet insurance
Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.
Original Posting:
04/23/2026 - Until Filled
Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.
Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.
