In this talk / live-coding session we will have a practical look at how a reactive web-application is different from a "normal" one and how resilience, elasticity and responsiveness translate into code. We will start by having a quick theoretical introduction to asynchronous computation and then build, run and load-test a small reactive web-application built with the Play Framework, exploring a few key concepts such as Futures, Actors and Circuit Breakers along the way.