Severin Hacker.

I’m the co-founder and CTO of Duolingo. I'm on Twitter and LinkedIn.

I also invest in early-stage1 tech2 startups3 in Pittsburgh. If you believe you have what it takes, send me an email: angel at

  1. pre series B ↩︎

  2. your technology should be your secret sauce ↩︎

  3. no small businesses, startup = growth ↩︎