Security research
#2 VDP Security Researcher Germany — HackerOne Q1/2026
Public evidence
Primary sources and surviving public artifacts for the central career points. First-person biographical claims remain identifiable and are not presented as third-party confirmation.
Source ledger
Kleinanzeigen.de
Lead/Sole Engineer for Kleinanzeigen.de, 2014–2019. Rebuilt and operated the FreeBSD platform end to end in Go, before its sale to eBay. First-person biographical claim.
2342 Holding
Founder & Owner of 2342 Holding.
Liftweb
Liftweb committer since January 2012, still listed by the project today.
Foursquare Rogue and Lift
Surviving artifacts for the Rogue MongoDB DSL integration and Liftweb work.
Own infrastructure
Own rack infrastructure since 2005. The historical progression from leodom.net through qs-housing.net to anycast.io, together with its early infrastructure context, is traceable through archive and RIPE sources.
Talks
Public event pages, slides and recordings.
Owned profiles and companies
First-party technical publishing, code and company context.