Holger Weiß
Co-founder Of Instant Messaging Service at Gultsch & Weiß GbR
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolHolger Weiß is a Berlin-based engineer and co-founder of an XMPP-based instant messaging service with 19 years of experience in Linux/Unix ops, distributed systems and protocol design. He is an Erlang/OTP specialist and regular contributor to ejabberd, having implemented critical features like XEP-0198 stream management and push notifications and authoring the eturnal TURN server. Holger blends hands-on system administration at Freie Universität Berlin with product-facing work building and maintaining highly reliable messaging infrastructure. His open-source contributions show a pragmatic focus on stability and interoperability—fixing memory bugs, hardening monitoring plugins, and adding server-side logging modules. Unusually for someone with this deep technical profile, he holds a Diplom in Sociology, reflecting a broader interest in human-centered aspects of communication systems.
19 years of coding experience
Diplom, Sociology, Sehr gut, Diplom, Sociology, Sehr gut at Freie Universität Berlin
English, German
Stackoverflow
21reputation
3kreached
2answers
0questions
Github Skills (29)
debug10
xmpp10
erlang10
messaging10
back-end-development10
session-management10
scripting10
nagios10
memory-management10
network-monitoring10
c1110
perl10
c1710
tcp-protocol10
script10
Programming languages (27)
Github contributions (5)
monitoring-plugins/monitoring-plugins
May 2009 - Oct 2021
A suite of Monitoring Plugins (formerly known as nagios-plugins)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 reviews, 370 commits, 24 PRs in 12 years 6 months
Contributions summary:Holger Weiss primarily contributed to the codebase by synchronizing the project with the latest Gnulib code. They also addressed several bugs related to memory allocation issues, particularly in the context of threshold data and database interactions. Furthermore, they implemented new functionality for the `check_ntp_peer` plugin, enabling the checking of the number of usable time sources.
monitoringmonitoring-pluginspluginautoconfc
processone/ejabberd-contrib
Apr 2014 - Nov 2019
Growing and curated ejabberd contributions repository - PR or ask to join !
Role in this project:Back-end Developer
Back-end DeveloperContributions:223 commits, 15 PRs, 144 pushes in 5 years 7 months
Contributions summary:Holger primarily contributed to the ejabberd-contrib repository by modifying and adding modules related to server-side functionality. Their work involved removing debug calls and updating function calls within the `mod_s2s_log` module. They also fixed output issues in the `mod_muc_admin` module and added a new module, `mod_message_log`, to write message stanzas to a log file. Further contributions included updating build scripts and core header files related to ejabberd.
golangejabberdjoingrowingask
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