CAES APD (CAES Advanced Program Development, formerly known as CAES Advanced Technology Engineering (CAES ATE), also known as Colorado Engineering Inc. (CEI)) is a company that develops and produces hardware, software, and system solution technologies. It offers radar and communications systems, boards and modules, and other products as well as system and subsystem modeling, systems requirements analysis and design, component development, system integration plans, frequency agnostic development capabilities, etc. The company caters to commercial, industrial, automotive, military, and other industries.