I have been active since 2006 and my home wiki is Persian Wikipedia where I'm sysop, bureaucrat, oversight and check user but you can find me in other wikis too. As a software engineer in Wikimedia Germany, I'm also a developer of Wikidata.
In my volunteer capacity, I've been doing lots of small technical things like maintaining Wikimedia Meet, co-maintaining codesearch, building tools for CheckUsers and improving database schema design and consistency of mediawiki core, and improving the software behind mailing lists. I'm also chair of Code of Conduct Committee in technical spaces.
(I try to keep track of them in mw:User:Ladsgroup/Volunteer stuff)
I'm also global interface editor, meaning I'll be editing your wiki's interface to prevent it from breaking.
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gmail.com (volunteer stuff)