Company Description Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions. Job Description The People Business Partner is a senior HR professional responsible for delivering pragmatic, high-quality people solutions across the full employee lifecycle. Acting as a trusted advisor to senior leaders, you will translate business priorities, people data and insight into clear, actionable people plans that enable performance, engagement and organisational effectiveness. This is a broad generalist role operating within a complex, matrixed and fast-paced environment. You will work confidently and independently at senior level, building credibility quickly and using sound judgement, commercial insight and data to influence decisions, challenge constructively and drive measurable outcomes. You will also manage your own Employee Relations caseload, providing pragmatic advice across a range of employee matters and applying UK employment law appropriately and commercially. Based on a hybrid working model with regular presence required in our London office (minimum 2 days per week), the role also involves travel to other Assystem sites. Key areas of responsibility * Partner with senior and operational leaders to develop and deliver people plans aligned to business priorities, building trusted relationships while confidently influencing and challenging. * Manage your own Employee Relations caseload, providing pragmatic advice and applying UK employment law to achieve fair, consistent and commercially appropriate outcomes. * Support organisational change, workforce planning, utilisation and capacity activity, translating business requirements into clear people actions. * Use people data and KPIs to identify trends, risks and opportunities, turning insight into targeted action and measurable outcomes. * Navigate complex organisational structures, governance and competing stakeholder priorities to drive decisions and deliver effective outcomes. * Contribute to policy development, process improvement and strategic people initiatives across the wider People function. * Embrace AI and technology-enabled ways of working to improve efficiency, insight and the quality of People solutions. You will work closely with the Business Unit Director (dotted line to the Senior People Manager) and collaborate with the wider People Team to deliver a consistent, high-quality HR service. Qualifications Your Profile * CIPD member, with a Level 7 qualification preferred. Candidates qualified to Level 5 with strong relevant experience will also be considered. * Proven experience as a senior HR or People Business Partner within a large, complex and matrixed organisation, ideally within an operational environment. * Strong generalist HR experience, with the confidence to independently manage an Employee Relations caseload and good practical knowledge of UK employment law. * A credible and confident partner who can build relationships quickly, influence and constructively challenge senior stakeholders, and navigate competing priorities. * Experience translating business challenges into people plans and initiatives, with clear evidence of personal contribution and measurable business impact. * Strong analytical capability, including using people data and insight to inform decisions, alongside practical experience of organisational change and workforce planning. * A clear and impactful communicator who is digitally confident, curious and comfortable using AI and technology to enhance ways of working. Experience within an international environment and French language capability would be advantageous. Additional Information Why Join the Community of Switchers? Join one of the top three largest nuclear engineering companies globally and be a part of a dynamic team driving energy transition. At Assystem, we offer a multicultural environment, career progression opportunities, and the chance to work on industry-leading projects that make a real difference in the world. Please be aware that many roles at Assystem are subject to both security and export control restrictions. These restrictions mean that factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the roles you are eligible to perform within the organisation. All applicants must as a minimum achieve Baseline Personnel Security Standard. Many roles also require higher levels of National Security Vetting where applicants must typically have 5 to 10 years of continuous residency in the UK depending on the vetting level required for the role, to allow for meaningful security vetting checks. NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process. We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.