With over 50 years'​ experience and almost ,000 employees, Zellis provides payroll, HR and managed services to UK and Ireland based companies with over 500 employees. We are the largest business of this nature in the UK counting a third of the FTSE 100 as customers, serving over 5 million of our customers'​ employees and processing in excess of 60 million payslips a year.We are also the people behind ResourceLink, the award winning Payroll and HR software.