We have a current opportunity for a HR Administrator on a temporary basis. The position will be based in Abingdon. For further information about this position please apply. Role Title: HR Administrator Contract : Minimum 6 months Overall Purpose: The role provides critical operational support across the employee lifecycle, with particular responsibility for delivering accurate, timely, and compliant payroll and people processes. It requires the application of professional judgment, initiative, and specialised knowledge to resolve employee queries, maintain data integrity, and ensure seamless end-to-end process execution. Operating within a structured, detail-focused framework, the role manages multiple interrelated processes to a high standard of accuracy and consistency. It is designed to deliver service excellence by responding to the needs of employees and stakeholders with urgency and professionalism, while also driving process improvements. The role works collaboratively across functional teams to deliver integrated, organisation wide solutions. It also requires effective prioritisation of competing demands, ensuring the delivery of high quality outcomes within defined deadlines. Accountabilities: Manage the end-to-end payroll administration process within the ERP system, ensuring precise input and maintenance of employee data to enable correct and timely monthly payments and pension forecasts. Apply a thorough understanding of payroll-related compliance requirements, ensuring processes align with internal governance, statutory obligations, and HMRC regulations Use knowledge and their judgment in responding to complex payroll and HR-related queries via the People Service helpdesk, applying in-depth knowledge and discretion to resolve issues independently Support line managers and employees with the interpretation and application of HR policies, demonstrating initiative in resolving issues while escalating sensitive or nontypical cases appropriately. Deliver engaging and informative onboarding sessions for new employees, introducing key People policies, systems, benefits, and pensions, and serving as their first point of contact during the initial employment phase Manage the relocation support process in line with public sector and UKAEA policy, including assessment of claims, issuing formal acceptance letters, and calculating relocation recoveries for leavers in liaison with Finance Proactively identify opportunities for process simplification, workflow enhancements, and better employee-facing guidance materials to improve operational effectiveness Ensure all data handling complies with GDPR, managing document storage within SharePoint with a focus on secure, timely and auditable information practices Act as the operational interface between UKAEA and outsourced pension providers in respect of quote requests Specific Qualifications/Experience: Proven experience in payroll, HR operations, or shared services within a medium-to-large organisation. Working knowledge of employment and payroll legislation including statutory leave, pensions, and GDPR. Experience using ERP systems Additional Duties: High level of accuracy and attention to detail in high-volume administrative environments. Strong interpersonal and communication skills; able to clearly explain complex policies and calculations. Excellent IT literacy including Microsoft Excel, HRIS systems, and digital document management platforms. Resilient, proactive, and able to work to deadlines in a highly regulated environment. Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants