Jeroen De Dauw

Jeroen De Dauw
Software Craftsman


I have been working with MediaWiki, the software behind Wikipedia, since 2009. During these 10+ years I have worked for several companies across the globe, including Google and the Wikimedia Foundation. Between 2012 and 2019 I worked for Wikimedia Deutschland as software architect, primarily on the Wikidata project. I created over a dozen MediaWiki extensions, contributed to many more and am one of the maintainers of Semantic MediaWiki.

Wiki services

I'm founder and Technical Director of Professional Wiki, a wiki consulting and hosting company. We are MediaWiki professionals that strive to provide holistic, high quality and sustainable wiki services. These services include fully managed wiki hosting, software upgrades and custom development. Get in touch if you have any questions.

My MediaWiki projects

Semantic MediaWiki

Semantic MediaWiki

Maintainer since 2011. On 1500+ public wikis. 80+ releases. 70+ contributors. Contract work for several companies.

Maps extension for MediaWiki


Created in 2009. On 1000+ public wikis. 60+ releases. 40+ contributors. Contract work for several companies.

Wikidata / Wikibase

Wikidata / Wikibase

Core developer with most contributions since 2012. Wikidata has over 50 million data items.

Commercial projects

Community projects


I'm Technical Director of Professional.Wiki. Contact us for: