TeamCity is a continuous integration and delivery server from JetBrains. A central server schedules builds, which run on build agents on Linux, Windows or macOS machines, either directly or in Docker containers. Organisations can run TeamCity on their own infrastructure as an on-premises installation, or use TeamCity Cloud, a managed service in which JetBrains hosts the server on AWS and provides build agents.
According to Wikipedia, JetBrains s.r.o. is a Czech private limited company founded in Prague in 2000, and it has never raised external capital. The group's headquarters are listed in Amsterdam, with offices in Europe, the United States and China. TeamCity Cloud runs on AWS, but the region is not stated on the pages reviewed. For a European organisation, the on-premises option keeps build pipelines, source code and secrets on infrastructure it controls, while the cloud option depends on the provider's data processing terms.