Castellum is a technology services company that provides cybersecurity, IT, software development, and systems engineering solutions primarily to U.S. federal government agencies and departments, particularly the Department of Defense and intelligence community. The company serves five market areas—Digital Solutions, C4ISR and Cyber & Space, Engineering Services, IT Services, and Mission Support—delivering capabilities ranging from intelligence analysis and data analytics to electronic warfare, information operations, platform modernization, and secure IT infrastructure. Revenue is generated through various government contract types including firm fixed price, cost-plus, time and materials, and indefinite delivery arrangements, with growth pursued through both organic expansion and strategic acquisitions that expand service capabilities, customer reach, and technological differentiation.