I'm a translation admin on Meta, Wikidata and Commons, and also a sysop in MediaWiki.org and Meta-Wiki (also in Meta I have flags "Interface admin" and "Central notice admin"). During a period from 2014-10-11 to 2016-11-15, I was also a Global Sysop for technical support small Wikipedias.
I was a member of the Arbitration Committee in the Russian edition of Wikipedia (firstly, since Dec. 2005 to Dec. 2006, and then a few more times, e.g. in 2019/20). I am also a member of Wikimedia RU (local Wikimedia chapter in Russian Federation).