Abstract: A cloud platform for managing Software as a Service (SaaS) resources is provided herein. The platform includes: a mediator server connected to computing resources, arranged to provide software developers a platform to develop SaaS applications, operable on the computing resources, wherein the SaaS applications and customer data are stored logically and physically independent of the computing resources, and data of SaaS application and the customer data are logically and physically separated. SaaS platform allows developers to provide software solutions via the mediator server directly to customers, and ensures data availability and data security. Access policy of users and developers to SaaS applications is centrally supervised and capable of integrating with other applications on the site of the customer. Upgrades to SaaS applications are performed in a predefined order of customers. Further, the SaaS platform facilitates selection and replacement of data storage provider.