YC Summer 2026 (S26) founder

Matija Milenovic

Founder of Hop Aero, Rocket cargo delivery to contested environments

Company

Matija Milenovic is listed as a founder of Hop Aero. Hop Aero is building rocket cargo vehicles that deliver to contested environments hundreds of miles away in minutes. Our rockets fly point-to-point into the most austere locations at hypersonic speeds. Hop Aero's goal is to provide the U.S. and allies the asymmetric advantage that deters a future major conflict.

Founder traction evidence

Public posts and activity attributed directly to this founder.

  1. X

    Introducing Rook by @Hop_Aero (YC S26): an autonomous hypersonic cargo rocket that delivers 550 lbs up to 450 miles in ~15 minutes.

    Introducing Rook by @Hop_Aero (YC S26): an autonomous hypersonic cargo rocket that delivers 550 lbs up to 450 miles in ~15 minutes. It launches from a standard 40-foot shipping container and lands on unprepared surfaces—no runways or fixed infrastructure required.

  2. X

    Just hosted Congressman Hern @repkevinhern at our test site.

    Just hosted Congressman Hern @repkevinhern at our test site. Thanks for stopping by! @jacobBalaj @Hop_Aero

  3. LinkedIn

    Matija Milenovic post about Hop Aero

    Matija Milenovic announced Hop Aero (YC S26) is part of Y Combinator.

  4. X

    A cool way to start your Monday: meet @paulg (founder of @ycombinator) and talk about rockets.

    A cool way to start your Monday: meet @paulg (founder of @ycombinator) and talk about rockets. @jacobBalaj @Hop_Aero

  5. X

    Meet Rook: a rocket that delivers an autonomous 21st century D-Day straight into contested environments.

    Meet Rook: a rocket that delivers an autonomous 21st century D-Day straight into contested environments. We spent our time in the @ycombinator batch heads down building. Excited to share what @Hop_Aero has been up to.

  6. LinkedIn

    This is the perfect example of who we are.

    This is the perfect example of who we are. Hop Aero (YC S26) executes no matter what. Yesterday afternoon we realised we were missing a long-lead component that would've delayed testing by at least 2 weeks. Our Founding System Engineer Tyson was on a plane within an hour and...

  7. X

    Thanks for having me! @Jason @twistartups

    Thanks for having me! @Jason @twistartups

  8. X

    We'll be dropping some more cool footage soon 👀 @Hop_Aero

    We'll be dropping some more cool footage soon 👀 @Hop_Aero