eserv (legally Energy Services International Ltd) is a British software and engineering company headquartered in Aberdeen, Scotland. It develops and operates AS-TEG, a cloud-based digital twin platform designed to support engineering-intensive workflows across complex industrial assets such as FPSOs, oil rigs, refineries, and power plants. Primarily serving the energy sector, Eserv’s platform offers a range of advanced features including remote virtual walkthroughs, dimensional control, clash detection, asset inspection, and seamless integration through REST APIs.