Castellum is a defense-focused technology company that delivers services to the U.S. federal government across several technical domains. Its core capabilities span Cybersecurity, Software Development, Systems Engineering, and Information/Intelligence Analysis. The company also works in Electronic Warfare, AI/ML, Data Analytics, Digital Modernization, and C5ISR.
Based in Vienna, Virginia, Castellum has grown in part through acquisitions, purchasing seven companies in its first four years of operation. The firm holds a record backlog of $273.3 million and reported revenue of $52.9 million in 2025. Notable contract awards include a $103.3 million Special Missions support services contract and a $66.2 million contract for logistics and cyber support services.
Castellum's work is concentrated in the defense and federal government sectors, with a stated commitment to national security and supporting warfighters.
