Группыbeards, developer documentation, mdn, sf-monument, summit2013, sumo, web development, amo
За него поручился
Burak Yiğit Kaya
He's been an avid contributor for quite a long time (probably has more patches than I do). He's also worked on SuMo with Ricky Rosario and on Kuma last year as a part of GSoC project.