I would like to nominate WMDE-leszek for +2 in mediawiki/ repositories.
Code reviews: https://gerrit.wikimedia.org/r/#/q/label:Code-Review%252Cuser%253DWMDE-leszek
Merged patches: https://gerrit.wikimedia.org/r/#/q/owner:%22WMDE-leszek+%253Cleszek.manicki%2540wikimedia.de%253E%22+status:merged
Leszek has been working with mediawiki since 2016, has worked on mediawiki features and extensions that are deployed to all / most WMF projects, including RevisionSlider and Wikibase. He has worked on refactorings in core (mainly around Watched items). I have no doubts.