RocketFuel

Jenkins is used for running tests before and after merge, for deploying changes and for running periodic tasks, similarly to cron. Jenkins

We're both steadily migrating our legacy code to ES6 and use Babel for our new Frontend projects. Babel

Gulp is used for writing transpiling, bundling, minification, watching and other tasks. gulp

Major part of our UI application uses Backbone models and views extensively. Though there's a plan to migrate to React and Redux. Backbone.js

Node.js is used both for our Frontend tooling and as a basis for some of our API endpoints. Node.js

Rails is used for some endpoints of our Frontend API. Though there are talks of deprecating it. Rails

Several of our applications and API servers are written using Ruby on Rails. Ruby is also used for various infrastructure tools. Ruby

New Relic is used both to monitor availability and to find potential candidates for optimization. New Relic