Building maintenance engineers, also known as building maintenance technicians or building mechanics, maintain the structure and systems of a building, such as plumbing, electrical, and air conditioning systems. They work in large buildings, schools, hospitals, and other organizations that have extensive facilities. In this role, you repair or replace equipment, perform regular checks on all systems running through the building, and ensure common areas are clean. Despite the name, this is not an engineering position as most people understand the term. Engineers usually design and build systems, while building maintenance personnel focus on maintaining systems that already exist in a building.