T-Systems Singapore | 26,535 followers on LinkedIn. Let's Power Higher Performance | With around 28,000 employees worldwide and annual revenues of EUR 4.0 billion (2021), T-Systems is one of the leading providers of digital services. The Deutsche Telekom subsidiary is headquartered in Germany and has a presence in Europe as well as in selected core markets and strategic production locations. T-Systems can provide a global production and supply chain to companies operating worldwide.