Building apps for the newest mobile devices using all the latest features and capabilities is sexy. But you know what's sexier? Building apps for (literally) billions of people. Most internet users aren't on blazing fast networks and don't have the latest flagship phones. This will become even more prominent as more people get access to the web. If you want these people to use your apps, you need to be able to give them an awesome experience. Let's take a deep dive into what it takes to optimize your android app for bad networks and single-core devices with less than half a GB of memory and see how you can start giving your next billion users a great experience starting today.