Tobias Lütke, CEO and co-founder of Shopify, is the #68 contributor to Rails.
Shopify is one of the largest Rails sites. In 2017, a Shopify engineer gave a presentation at RailsConf called 5 Years of Rails Scaling to 80,000 RPS, where RPS stands for “requests per second.” They employ over 4,000 people, although their GitHub organization only has 208 people, so probably it’s not 4,000 developers.
Either way, it’s impossible to mention Shopify without acknowledging its role in enabling white supremacy by providing its online storefront services to the fascist propaganda outlet Breitbart. Tobias has defended this decision on free speech grounds, an argument which is naive at best, but there’s no denying that Tobias has done a ton for Rails. Tobias is also certainly not the only brilliant Rails developer at Shopify, which continues pioneering Rails scaling work every year.
Tobias is an alumnus of the Rails core team and was active from 2004 to 2010. He racked up 131 commits during that time. The majority happened between 2005 and 2008. As you might expect for a significant and early contributor, Tobias’s contributions were all over the stack; however, not counting changelogs, his most frequently-edited files were mostly about ActiveRecord associations, and likewise, when you take out stopwords, the most frequently-used word in his commits was “associations.”
Notwithstanding my reservations about Shopify’s ethics, Tobias is a brilliant businessman and programmer, and one of the most significant early Rails contributors.