James Pearce and Al Sutton talked about two very different solutions used to overcome the problems inherent in building large mobile applications. For iOS and web developers, Facebook added Buck, Babel, Chrome Tools, Flow, and Clang to the open source Atom editor running in Chromium to create Nuclide as a scalable alternative to XCode. The open source nature of IntelliJ allows Facebook to contribute to that project to optimise the IDE for Facebook, allowing Android engineers to continue to use the tool they are familiar with as Android Studio.