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Wardstone

2+ employeesSeed raised
Satellites for Missile Defense

Satellites for Missile Defense

YC F25

About the Company

Wardstone is building the next generation of space-based missile defense. We design and deploy autonomous orbital interceptors capable of defeating hypersonic and ballistic threats, a capability the U.S. and its allies urgently need but that no one has yet delivered.

At Wardstone, you will build hardware that gets tested constantly and pushed to its limits, from US Air Force assisted ground experiments to supersonic ground launched platforms to future orbital prototypes. You’ll work on systems that combine advanced sensing, guidance, high-energy physics, and spaceflight in ways few organizations on Earth attempt.

We are a small, elite engineering team moving fast to solve problems of national importance. Every engineer has massive ownership, rapid iteration cycles, and a direct impact on the direction of the company and the defense of millions of people.

If you want to work at the intersection of space, autonomy, and national security, you should join Wardstone.

Tech Stack

Our first product, Hailstorm, integrates multiple advanced technologies:

  • VLEO satellite interceptors with high maneuverability and rapid response times.
  • Infrared sensing and real-time perception, enabling autonomous target detection and tracking.
  • High-impulse propulsion and high-energy dispersal systems capable of generating millisecond-scale accelerations.
  • Advanced guidance, navigation, and control (GNC) for midcourse correction and terminal homing.
  • Physics-driven simulation environments modeling orbital mechanics, missile trajectories, thermal loads, and pellet-cloud dynamics.
  • Kinetic particle-cloud intercept architecture that provides a cost-effective, scalable alternative to traditional hit-to-kill missile systems.

Founders

Sebastian Fischer
Sebastian Fischer

I am the cofounder & CEO of Wardstone, a space defense company building satellites to defend the U.S. and its allies from hypersonic and ballistic missiles. I have 10+ years of engineering and product experience in satellites, drones, and self-driving cars. I held leadership roles at Amazon Prime Air and Cruise Self-Driving and previously worked at Lockheed Martin and NASA on Planetary Spacecraft. I studied Aerospace Engineering at MIT and did a dual MS/MBA degree at Harvard.

Tobias Fischer
Tobias Fischer

I am the cofounder of Wardstone, where I lead the technical development of next-generation defense spacecraft. Previously I worked at Astranis, building, launching, and operating geostationary communication satellites. I hold a bachelor's in mechanical engineering from Cornell University. At Cornell, I was the Chief Spacecraft Engineer for a lunar CubeSat mission that demonstrated novel electric propulsion and navigation systems.

Ready to start your space career at Wardstone?

Shipping like we're funded. We're not. No affiliation.

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