Senior Payroll Transition Specialist 6 Months initial contract Basildon, UK (On-site, 5 days per week) £550-600 per day (Inside IR35) My client, in the Fintech industry are hiring a hands-on Payroll Transition Specialist to support major payroll transformation activity across EMEA. In this role you'll lead end-to-end payroll transitions across Germany, Belgium, and the Netherlands, including a key migration from ADP Streamline to ADP Celergo in Germany. This is a delivery role - you'll be in the detail, working directly with payroll teams and vendors to ensure successful testing, transition, and go-live. Key Responsibilities Lead payroll vendor/platform transitions end-to-end Own payroll testing (strategy, scripts, execution, defect resolution) Support UAT, data validation, and parallel runs Drive accurate, reconciled payrolls through to go-live Create clear SOPs and ensure knowledge transfer Train teams on new systems and processes Act as payroll SME across Payroll, HR, Finance, and vendors Key Requirements Proven experience delivering payroll transitions / implementations Strong ADP Celergo experience Germany payroll expertise (essential) Experience with payroll testing, parallel runs, and reconciliations Ability to operate hands-on in fast-paced environments Desirable: Belgium / Netherlands payroll experience Outsourced payroll / vendor management experience German or Dutch language skills Ideally you will have some of the below specific experience to be a suitable match for this engagement High-impact transformation work across multiple countries Full ownership of payroll transition delivery Visible role working closely with key stakeholders Disclaimer: This vacancy is being advertised by either Advanced Resource Managers Limited, Advanced Resource Managers IT Limited or Advanced Resource Managers Engineering Limited ("ARM"). ARM is a specialist talent acquisition and management consultancy. We provide technical contingency recruitment and a portfolio of more complex resource solutions. Our specialist recruitment divisions cover the entire technical arena, including some of the most economically and strategically important industries in the UK and the world today. We will never send your CV without your permission. Where the role is marked as Outside IR35 in the advertisement this is subject to receipt of a final Status Determination Statement from the end Client and may be subject to change.