Tan, Andreas: - Andreas Tan is a technology fellow in Deloitte's SAP practice. He is the chief architect with the focus on global as a service and digital transformational programs across a variety of industries leveraging SAP S/4HANA, SAP Billing and Revenue Innovation Management, and other technologies. He has more than 25 years of hands-on experience in implementing complex large-scale projects and designing business transformations to create a new economy model: the "subscription economy."