This document discusses a true SaaS HR solution called V4 Cloud. It provides payroll and HR management services to customers in various sectors like education, healthcare, manufacturing, and banking. The solution handles multiple employment relationships, automatic wage deductions, leave calculations, annual tax settlements, and Excel integration. It uses a single optimized data processor and metadata to interpret configurations, interfaces, reports and access rights for all customers on a single instance hosted in the cloud or on-premise. The technology has been in use since 2005 and now manages payrolls for over 10% of organizations in Czech and Slovak markets.