Projects

• NeoWiki – structured data and collaborative knowledge graphs for MediaWiki; open source, in early access (code)
• ProWiki – fully managed MediaWiki hosting, in Germany
• Admin Panel – a panel for configuring a wiki without code or SSH: one-click extensions, users and customization
• AI Assistant – an AI chatbot for MediaWiki that answers from your wiki’s content, with source citations

Since 2019 I build MediaWiki and Wikibase extensions at Professional Wiki, mostly funded by clients and published as open source. There are many more on its GitHub.

• Wikibase Export – 2023, for Universität Mannheim
• Wikibase RDF – 2022, for the Wikibase Stakeholder Group
• Automated Values – 2022, for the Luxembourg Ministry of Culture
• External Content – 2021, for an enterprise software company
• Wikibase EDTF – 2021, for the Luxembourg Ministry of Culture
• GND – 2021, for the German National Library
• Wikibase Local Media – 2020, for Rhizome
• Network – 2020, for KDZ
• Semantic Wikibase – 2020, connects Wikibase and Semantic MediaWiki
• Modern Timeline – 2019, for KDZ

I was one of the original developers of Wikidata at Wikimedia Deutschland, from the start of development in 2012 until 2019, most of that time as software architect. I’ve created more of Wikibase’s capabilities than anyone else, including much of its data layer and these libraries. My talk Wikibase, the Software behind Wikidata (2014) gives an overview. Professional Wiki offers Wikibase services.

• Wikibase DataModel – the canonical PHP implementation of the data model at the heart of Wikibase
• Wikibase DataModel Serialization – serialization and deserialization of Wikibase DataModel objects
• Wikibase Internal Serialization – the same, for the formats used on the Wikimedia cluster
• Wikibase DataModel Services – services around Wikibase DataModel
• JsonDumpReader – reads and iterates through the entities in a Wikibase JSON dump
• Wikibase TermStore – looks up terms by ID and IDs by term (archived)
• QueryR EntityStore and QueryR TermStore – persistence and lookup of Wikibase entities and terms

At Wikimedia Deutschland I also led the rewrite of the fundraising application, which became my reference for implementing the Clean Architecture.

Presentation

What people say

Roles as at the time of writing.

I’ve contributed to Semantic MediaWiki since 2009 and maintained it since 2011, including as release manager. Professional Wiki now maintains it and much of its ecosystem, and offers Semantic MediaWiki services. I created Maps in 2009, and it’s still maintained.

• Semantic MediaWiki – maintainer since 2011
• Maps – creator, 2009
• Semantic Result Formats – maintainer since 2011
• SubPageList – creator, 2010
• Semantic Watchlist – 2011, for the IEEE
• Semantic Image Input – 2011, for WhoInspired
• Spark – 2011
• Validator – 2009, parameter handling for extensions (archived)

Presentations

Note that the slides are generally not designed for after-talk usage. However, they are useful when watching the recording of a talk.

I’ve worked with MediaWiki, the software behind Wikipedia, since 2009, and I’m one of the developers credited in its copyright notice. Before Professional Wiki, I built these extensions for clients and the community, and contributed to dozens more (see my mediawiki.org user page).

• Push – 2010, for Texas Instruments
• Live Translate – 2010, for Texas Instruments
• Survey – 2011, for the IEEE
• Contest – 2011, for the Wikimedia Foundation
• Education Program – 2012, for the Wikimedia Foundation
• Nuke – significant contributions in 2012
• GitHub – 2013
• ParserHooks – 2013

All of these are on Packagist.

• Diff – representing, computing and applying diffs between structured data; used by Wikipedia
• DataValues Geo – parsing, formatting and representing coordinates; used by Wikipedia
• EDTF – Extended Date/Time Format, 2021, for the Luxembourg Ministry of Culture
• ParamProcessor – declarative parameter processing; from 2010, with the legacy code to match
• File Fetcher – an object-oriented file_get_contents alternative, with adapters and decorators
• PsrLogTestDoubles – test doubles for the PSR-3 logger interface
• Simple Cache – a minimal caching interface with basic implementations
• Euro – a value object for a positive amount of euro
• Serialization – interfaces for serialization and deserialization services
• Batching Iterator – an iterator that fetches values in batches
• Message Reporter – an interface for reporting text messages
• PostRequestSender – a PostRequestSender interface with test doubles

• ReplicatoR – 2014–2015, a command-line tool that replicates Wikibase entities, mainly from Wikidata, for the QueryR REST API
• Skynet – 2010, solves the travelling salesman problem with GALib, in C#
• GALib – 2010, a genetic algorithm library in C#
• BN+ Converter Pro – 2007–2010, text conversion utilities in VB.Net
• BN+ Brute Force Hash Attacker – 2008–2010, in VB.Net
• BN+ Library – 2008–2010, a .Net utilities library
• Art of Defence SE4 – 2008–2010, a Command & Conquer: Generals map

Supreme Commander maps

I maintain several survival maps (custom scenarios written in Lua) for Supreme Commander Forged Alliance Forever. These maps were created long ago by other people, and I have been gradually cleaning up their code and adding features.