We strongly recommend you host a bespoke PaaS in a single public cloud, using Amazon Web Services (AWS), Azure, or Google Cloud Platform (GCP). We have deep expertise in all three of those public clouds. Each is an effective foundation for a bespoke PaaS because they offer a tried-and-tested, on-demand, cloud computing platform, with a wide range of reliable cloud services that can be provisioned instantly and billed on a pay-per-use basis.