Developer-collaboration company behind the github.com platform (source hosting, pull requests, issues, Actions). Runs a large, ~10-year-old Ruby on Rails codebase. Employs Erwin Kroon on the Issues platform team; also cited as the workplace of John Hawthorne, who is deeply involved in Sorbet adoption and performance work there. The team is gradually introducing Sorbet to make refactoring safer, enable splitting up the deployment and improve performance.