HR Administrator

Skip to main contentBack to all jobsHR AdministratorLondonFull-timePermanent employeeApply for this jobAbout the jobThe HR Administrator is the operational backbone of the Flatpay UK People team. This is a high-volume, detail-critical role with onboarding at its core — coordinating up to 100 new starters each month, from logistics and accommodation through to HRIS setup and contract administration. You will work closely with the Head of HR and HR Advisor, executing the day-to-day administration that keeps the People function accurate and running at pace. The role suits someone who takes genuine pride in getting the detail right, manages competing priorities without dropping the ball, and understands that in a scaling business, clean HR admin is the foundation everything else is built on.What you'll doOnboarding CoordinationCoordinate end-to-end onboarding logistics for up to 100 new starters per month, including accommodation booking, catering, and travel arrangements for multi-day cohort programmes.Create and configure new starter profiles on Personio ahead of day one, ensuring all data is accurate, complete, and compliant before the employee arrives.Collect and verify pre-employment documentation — right to work, signed contracts, and new hire information.Act as the day-of point of contact for new cohorts, ensuring a smooth, well-organised, and welcoming first-day experience. HR Administration & RecordsMaintain accurate, up-to-date employee records in Personio across the full employee lifecycle, from contract issue through to offboarding.Draft and issue contract variation letters for role changes, promotions, salary adjustments, and department transfers, ensuring all changes are reflected in the HRIS on the same day they are confirmed.Process leavers in Personio, coordinating with payroll to ensure accurate final pay and completing all associated administrative steps on time. First-Line Employee QueriesServe as the first point of contact for standard employee queries, providing clear, accurate answers grounded in the Employee Handbook — covering areas such as annual leave, sickness reporting, expenses, and working hours.Direct any complex, sensitive, or ER-related queries to the HR Advisor or Head of HR promptly, without attempting to resolve matters outside this scope.Maintain a consistent, professional, and helpful tone in all employee communications, reflecting the standards of the People team. General HR OperationsSupport the HR team with administrative tasks across the employee lifecycle as required, including filing, correspondence, and system updates.Keep onboarding trackers, administrative documentation, and people data accurate and current at all times.Contribute to a People function that runs efficiently, accurately, and at pace with business growth.Who you areExceptionally organised with strong attention to detail — able to manage a high volume of tasks simultaneously.Clear, professional communicator — written and verbal, with the confidence to give employees straightforward, accurate answers on policy and process.Comfortable working to tight deadlines in a fast-moving, high-growth environment.Background & Requirements1–2 years of administrative experience in a fast-paced environment; experience in HR is an advantage but not required.Demonstrably organised and detail-focused — able to give examples of managing high-volume, time-sensitive tasks accurately.Confident using systems and technology; prior experience with an HRIS (e.g. Personio, HiBob, or similar) is a plus but not essential.Right to work in the UK (visa sponsorship is not available for this role).Why Flatpay?At Flatpay, how we work matters as much as what we achieve. Happy Humans — We bring energy to our work and create teams people enjoy being part of.No Assholes — We perform at a high level while treating colleagues and customers with respect.It’s Our Business, Own It — Everyone takes responsibility and manages their work like it’s their own...