We created a Node.js web app from scratch within 9 weeks that now serves 10.81 million visitors each month*. We used the latest and greatest incarnation of JavaScript – ECMAScript 2015, a.k.a. ES6 – for the backend and frontend alike. We spent late nights coding in gleeful frenzy, stepped into pitfalls, moaned about WTFs, scaled the dizzy heights of asynchronicity. This is our story.