Title:
Senior HR Advisor
Senior HR Advisor - Sellafield PPP Programme
Location: Leatherhead (Head Office) with regular travel to Warrington & West Cumbria (Once a month and ad hoc as needed)Working pattern: Minimum 3 days per week in the office
Or
Location: Cumbria with regular travel to Warrington & Leatherhead (Once a month and ad hoc as needed)Working pattern: Minimum 3 days per week in the office
We're looking for a proactive, confident, and experienced HR Advisor to support the Sellafield PPP Programme-an innovative 20‑year partnership delivering major infrastructure projects essential to the safe management of nuclear material. This is a high‑profile, multi‑partner environment where effective people support is critical to success.
As part of our HR team, you'll provide hands-on generalist support across the Programme, working closely with HR leadership, managers, and project teams to deliver exceptional HR services. If you thrive in a fast-paced, structured and project‑driven environment, we'd love to hear from you.
About the Sellafield PPP Programme
Sellafield Ltd is undertaking a 20‑year, ~$6.5bn capital programme to deliver 17 major construction projects. Four project partners-covering Integration, Engineering & Design, Civil Construction and Process Construction-are working together as one integrated team to safely and efficiently deliver critical infrastructure.
This role is central to enabling high performance within a complex, multi-stakeholder landscape.
What You'll Be Doing
Strategic & Operational HR Support
+ Deliver people plans and HR initiatives alongside the Programme People Partner.
+ Act as a trusted advisor to managers, providing sound HR guidance with minimal supervision.
+ Use HR data and insights to support informed decision-making.
+ Champion employee experience, wellbeing and inclusion across the Programme.
Employee Relations
+ Provide first-line HR advice on disciplinary, grievance, performance, absence and conduct matters.
+ Independently lead ER cases and support complex investigations.
+ Guide managers through performance improvement and absence management.
+ Oversee leaver processes and monitor attrition trends.
Recruitment & Onboarding
+ Partner with recruiters and hiring managers to ensure smooth onboarding.
+ Deliver Programme and KBR inductions for new starters.
+ Support managers with probation management and outcomes.
Reward & Recognition
+ Apply reward, promotion and compensation principles consistently.
+ Process salary changes, organisational updates and maintain accurate HR data.
Employee Wellbeing, Culture & Development
+ Support identification of learning needs and development opportunities.
+ Assist with management of apprenticeships and levy activity.
+ Promote wellbeing, inclusion, engagement and company values.
What You'll Bring
Essential
+ Strong HR generalist background, ideally within a large, project-based or highly structured organisation.
+ Good working knowledge of UK employment law, HR policies and HR systems.
+ Experience managing or supporting ER cases with limited supervision.
+ Ability to interpret policies, coach managers and provide practical HR advice.
+ Excellent communication, stakeholder management and interpersonal skills.
+ High levels of integrity, accuracy, planning and problem-solving.
+ Confidence working independently in a fast-paced environment.
+ Strong IT skills (Microsoft Suit and HR platforms including Workday, SharePoint, Documentum).
+ Ability to obtain security clearance.
+ Due to the nature of our work and security requirements, KBR does not offer sponsorship. We can therefore only consider applicants with the right to live and work in the United Kingdom
Desirable
+ CIPD Level 5 (or working towards).
+ Experience with change programmes or HR improvement initiatives.
+ Experience in multi-stakeholder project environments.
+ Presentation or induction delivery experience.
+ Experience of Workday
Why Join Us?
This is a unique opportunity to play a pivotal role in a nationally significant programme while building your HR career in a complex and rewarding environment. You'll work closely with senior leaders, be trusted with autonomy and make a real impact on the employee experience across multiple project sites.
KBR Company Information
When you become part of the KBR team, your opportunities are endless. Through collaboration with our customers, we're defining tomorrow's challenges, then providing the solutions and services to overcome those challenges, always maintaining our commitment to total safety and reliability.
At KBR, we partner with government and industry clients to provide purposeful and comprehensive solutions with an emphasis on efficiency and safety. With a full portfolio of services, proprietary technologies and expertise, our employees are ready to handle projects and missions throughout their entire lifecycle, from planning and design to sustainability and maintenance. Whether at the bottom of the ocean or in outer space, our clients trust us to deliver the impossible on a daily basis.
Working at KBR means being rewarded for your contributions. In addition to competitive benefits and professional development, our people are empowered to use all their potential, creating meaningful change for themselves and our clients. We attract the best minds in the world because our expertise thrives on creativity, resourcefulness and collaboration. That is how we supply our clients with cutting-edge solutions and services.
As the needs of the world change, we're ready to respond and guide the way forward with strategic, sustainable, and technological advancements grounded in more than a century of practical application and execution.

KBR, Inc.

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