This document summarizes mobile testing practices at Gilt. It describes how Gilt started with an informal mobile testing process when the app was simple, but as features and the codebase grew, more structure was needed. Gilt introduced continuous integration, code conventions, and began writing tests to help scale testing and reduce issues. They chose Appium for mobile test automation since it uses the same Selenium infrastructure they had in place and allows testing on both iOS and Android without needing to compile a separate SDK. Page object modeling and explicit waits were implemented to make tests more reliable and representative of the app's state. While challenges remain around overlays and accessibility, writing tests has helped testing scale and reduced pressure on QA as the mobile business grows.