Hi, I'm David Klionsky.

I'm a software engineer focused on education and building apps that people love.

I'm currently working on PlayScout, an app for helping families find great playgrounds.

Previously, I was employee #12 at Duolingo and the founding engineer for Duolingo for iOS, which Apple named its iPhone App of the Year in 2013.

Tinycards, which I started and led, was Duolingo's first educational app beyond language learning — and one of Apple's Top 10 Apps of 2016.

I also built and co-led Duolingo ABC, making early literacy accessible to families everywhere.