About BAE Systems Electronic Systems BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services. SPECIFIC RESPONSIBILITIES: Maintains, adjusts, repairs, installs, tests and operates all types of air conditioners, chillers, steam absorption units, environmental chambers, heating systems, hydraulic systems, vacuum pumps, pneumatic and DDC controls and component parts for each of the above systems.