Professional MediaWiki Development

Collaborate with us on your next software project.
Enjoy a stress-free experience and a reliable product.

MediaWiki

Semantic MediaWiki

Wikibase

MediaWiki Development Services

MediaWiki Extension Development Our MediaWiki developers create or enhance extensions for your specific needs.
MediaWiki Integration Our consultants integrate your MediaWiki with other software. Authentication, import, export, web hooks, APIs, we have got you covered.
MediaWiki Skinning Make your wiki look unique with a custom theme. Our developers create a new MediaWiki skin or configure an existing one such as our very own Chameleon.
MediaWiki Import Tooling Import data from other systems into MediaWiki. Our developers create import tooling, possibly based on Semantic MediaWiki or Wikibase.
MediaWiki API Development Make data stored in your wiki accessible by external systems. Our developers create high-performing and compliant web APIs for your wiki.

Your Benefits

High standards

Proven track record

Iterative processes

Play it safe We have a long and proven track record of successful projects starting in 2009. We are well respected within the MediaWiki community.
Work with real experts We have a unique combination of deep MediaWiki and deep software development expertise. You don't have to take our word for it, our track record and public code repositories speak for themselves.
Get your desired results quickly We practice iterative development and work with our clients to ensure we create the best solutions for their use cases.
Enjoy quality software We deliver sustainable software with high internal and external quality. We follow clean code practices, create automated tests and develop with continuous integration.
Bug-free - guaranteed! Bugs are our responsibility. We are committed to delivering quality work. If any bugs do slip through, we fix them free of charge.

Our team has developed software for

About Professional Wiki

years of experience

260+

clients helped

40+

extensions created

48000+

code changes

Professional Wiki GmbH is a Berlin-based company with an international team that serves international clients.

We are MediaWiki veterans with expertise that includes MediaWiki hosting and MediaWiki software development.

Professional Wiki has made significant contributions to MediaWiki, Semantic MediaWiki and Wikibase. We also created over 40 MediaWiki extensions and write a lot of MediaWiki documentation.

We are a customer-focused agile company. We value professionalism, quality and sustainability. Learn more about Professional Wiki.

Join our team.

GitHub

YouTube

Twitter

Get Started

Customer Testimonials

We highly recommend Professional Wiki for any project in the Mediawiki/Wikibase space.
IP Squared and Digital Werktuig, for Automated Values and Wikibase EDTF

Professional Wiki provided Rhizome with competent and timely custom development work. Making use of all the tools that are available to open source developers today, the team built extensions that follow modern software design guidelines, are easy to install, configure, and maintain, and include good documentation and automated testing. Quite unique in the Mediawiki space!
Dragan Espenschied, Preservation Director at Rhizome

We wished to display SPARQL query results in our Wikibase and commissioned Professional Wiki to develop a solution. They created a flexible extension that is just what we needed.
Dr. Tim Conrad, Professor at Freie Universität Berlin

Jeroen is one of the most productive and passionate developers that I know. Without Jeroen, Wikidata would not have such a rich range of functions and would be built on a less flexible, lower-quality codebase and architecture. Jeroen has in-depth knowledge and broad experience about clean code and software architectures. I have always appreciated his professional attitude, collegial and reliable manner. He is an absolute win for any team and project!
Abraham Taherivand, Executive Director at Wikimedia Deutschland, for Wikidata and Wikibase

Recent MediaWiki Extensions

Public MediaWiki extensions that we recently created for our clients.

Page Approvals

Created in 2024 for a major multinational corporation

Increase trust in your knowledge base via approval workflows for wiki pages.

Source code Documentation

Wikibase Export

Created in 2022 for Universität Mannheim

Wikibase Export adds a user-friendly and customizable export interface to Wikibase.

Source code Documentation Demo wiki Demo video

Automated Values

Created in 2022 for the Luxembourg Ministry of Culture

Wikibase extension that allows defining rules to automatically set labels or aliases based on Statement values.

Source code Documentation Demo wiki Demo video

External Content

Created in 2022 for Pega Systems

Allows embedding and rendering markdown files into wiki pages. Has special integration with GitHub and Bitbucket.

Source code Documentation Demo video

Wikibase RDF

Created in 2022 for the Wikibase Stakeholder Group

Wikibase extension that allows defining RDF mappings for Wikibase Entities.

Source code Documentation Demo wiki

Wikibase EDTF

Created in 2021 for the Luxembourg Ministry of Culture

Wikibase extension for the Extended Date/Time Format (EDTF) Specification that is specifically designed to process more complex dates and times.

Source code Documentation Demo wiki Demo video Library source

Network

Created in 2020 for KDZ - Zentrum für Verwaltungsforschung

Extension for visualizing connections between wiki pages via an interactive network graph.

Source code Documentation Demo video

Our MediaWiki Projects

We created over 40 MediaWiki extensions and contributed to over 100. Here are some highlights:

Semantic MediaWiki

Semantic MediaWiki (SMW) is a free, open-source extension to MediaWiki that lets you store and query data within the wiki's pages.

Work with the best Semantic MediaWiki developers in the world. We created large parts of SMW, are its maintainers, and also provide Semantic MediaWiki hosting.

Wikibase

Wikibase is a free, open-source software platform for creating knowledge bases. It powers Wikidata and is primarily developed by Wikimedia Deutschland.

Work with the best Wikibase developers. We created arge parts of Wikibase itself, developed various extensions for our clients, and provide Wikibase hosting.

Maps

Created in 2009 during Google Summer of Code

Google Maps and Leaflet integration for MediaWiki. Embed dynamic and highly customizable maps into your wiki. Features a visual map editor and integration with Semantic MediaWiki.

Source code Documentation Demo wiki Demo video

We maintain Chameleon, the most popular mobile and responsive MediaWiki skin. Chameleon is highly customizable, often used by companies to brand their corporate wikis in line with their corporate identity.

Source code Documentation Example wikis

ProWiki

Launched in 2022

We created the most modern MediaWiki hosting product on the market. Create your wiki by filling out a simple form and manage it via a user-friendly wiki administration interface.

We developed ProWiki with the same rigor that we apply to projects for our clients. While it is not open source, our creation and operation of the platform demonstrates our expertise.

Website Blog

Our History

2009

Our Humble Beginnings

Our founders attend their first SMWCon. Jeroen creates the Maps extension.
2010-2018

We Level Up

We become maintainers of Semantic MediaWiki. Jeroen creates Wikibase and Wikidata, and is promoted to Software Architect at Wikimedia Deutschland. Karsten launches WikiHoster.net.
January 2019

Founding of Professional Wiki

We start collaborating formally to deliver next-level MediaWiki services.
May 2022

ProWiki Launches

We launch ProWiki, the most modern and user-friendly MediaWiki hosting platform.

Learn more about Professional Wiki.

Get Started

Software Development FAQ

We develop both. It is up to our clients to decide whether the work we do for them is open-source and which license should be used for the software. In the case of open-source projects, they decide to which degree the software should be made available via documentation and demos. They can also choose how they are attirbuted, if at all.

We take great care to prevent bugs through extensive automated testing, peer review, and code analysis tools. Bugs are our responsibility, which is why our standard software development contracts include a warranty clause that covers fixing defects discovered within several months after delivery, free of charge.

We cannot transfer our multi-decade software development and MediaWiki experience in the course of one day.