Hardware Designed for Production at Scale
Castelion delivers the capabilities America needs to preserve peace through credible, non-nuclear deterrence. We build at the scale national security demands – optimizing every system for cost, manufacturability, and rapid deployment.
Hardware Rich.
Rapid Test and Iteration.
Designed for Scaled Manufacturing.
Affordable Hypersonic Weapons, Built Fast
At Castelion, speed and cost aren’t tradeoffs – they’re requirements. We vertically integrate core technologies to move faster, reduce risk, and control cost at scale. Every system is designed for manufacturability from day one, enabling rapid iteration and high-volume production. In today’s threat environment, speed matters. Affordability matters. We’re building with both.
Protecting Democracy
Our mission is rooted in the belief that freedom must be actively protected – through technological strength, strategic clarity, and national resolve. By restoring America’s ability to out-innovate and out-produce its rivals, we help ensure that the free world remains secure for generations to come.
Hardware Rich
Rapid Testing
Iterative Design
America Needs You!
Ready to get your hands on real hardware, own critical projects, and make your work count? Explore our open roles and help shape the future of defense.
Featured Positions
Choose your next adventure with Castelion.
Castelion News
Castelion Breaks Ground on Project Ranger, Advancing Scaled Hypersonic Manufacturing in New Mexico
Castelion today announced the launch of Project Ranger, a 1,000-acre hypersonic manufacturing campus in Sandoval County, designed to support high-cadence production of hypersonic strike systems. This new 1,000-acre manufacturing campus will invest more than $220 million, create 300+ high-paying jobs, and generate over $650 million in economic impact for New Mexico.
Castelion Closes $350 Million Series B to Mass Produce U.S. Hypersonic Weapons
Castelion, a cutting-edge defense technology company working to restore America’s conventional deterrence capability, announced today it raised $350 million in Series B financing, positioning the company to directly advance a top Pentagon modernization priority: hypersonic munitions production at scale.
The Series B round was led by Altimeter Capital and Lightspeed Venture Partners, with participation from Lavrock Ventures, Andreessen Horowitz, General Catalyst, First In, Space VC, Cantos, BlueYard, Avenir, Champion Hill, and Interlagos.
Castelion Announces Project Ranger, New Mexico’s Newest Hypersonic Manufacturing Campus
Castelion announced today that it selected Sandoval County, New Mexico, as the site for Project Ranger, a 1000-acre solid rocket motor manufacturing campus dedicated to next-generation hypersonic systems. The initiative is projected to create 300 high-quality jobs and generate over $650 million in economic output over the next decade.
Castelion plans to invest more than $100 million in Project Ranger’s development, with additional capital to follow. Project Ranger will produce solid rocket motors, conduct static tests, and assemble components to produce finished rounds, reinforcing New Mexico’s position at the forefront of defense innovation.