Castelion

Castelion is a Torrance, CAu2013based defense tech startup focused on modern defense manufacturing and next-generation aerospace systems. Specializing in avionics manufacturing, aviation equipment manufacturing, and advanced defense production, Castelion develops high-performance, mission-ready technologies built for speed, precision, and reliability. Our team combines cutting-edge engineering with agile manufacturing processes to deliver scalable solutions that support national security and modern aerospace innovation. From concept to production, Castelion is redefining how advanced defense systems are designed, built, and deployed.