Hey,I am Joe

I'm Josef Wilhelm, an app developer in Vienna, Austria. I build apps with Flutter and have shipped over 40 of them since 2019. My first app, Tag Me, reached 500 000 downloads. I also help teams bring AI agents like Claude Code, Codex or Cursor into their daily work.

Here are links to all my apps in Google Play and App Store

I'm in my mid thirties, live in Vienna, Austria. I fell in love with Flutter in March 2019 when I decided to program my first app (Tag Me). 500 000 downloads later I'm more in love than ever. More about me.

I post a lot on LinkedIn and X.

Josef Wilhelm

Work With Me


I take on select client projects. Ideal collaborations start with a clear vision - your idea, design, and feature requirements already mapped out.

Just send me an email or call me.

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Thoughts about Flutter, mobile development, and a lot about being self-employed.