Hi, my name is David Klionsky.
I built Duolingo's first iOS app.
I led the team that made Tinycards, a free flashcard app for students.
I made @DailyBillBot, a bot that tweets random bills recently introduced to Congress.
I made a calculator that breaks down how your tax dollars might have been spent.
I love to write puzzles and abridge movie plots.
I made an interactive explanation of how the Enigma machine works.