Armin Ronacher (born 10 May 1989) is an Austrian open source software programmer and the creator of the Flask web framework for Python.

[8] After an elaborate April fool's joke where he bundled his libraries in a one-file microframework[9] he decided to create the Flask web framework.

It went on to become one of the two most popular web development frameworks (next to Django) for Python and the associated libraries found a new home under the "Pallets"[10] community.

He also created the Lektor CMS and contributed to a large list of Open Source applications and libraries.

He worked for Plurk, for Fireteam (a game network infrastructure company owned by Splash Damage),[11] and most recently for the Sentry crash reporting tool.