Modern applications have gotten to the point that they are often too large to manage. These builds will be painfully long, so iterations on the code are not something developers want to do, and the speed of development drastically decreases. To help build developer happiness, the idea of isolated development and demo applications has come up again and again. In this presentation, learn how to take a single feature you are working on and run it in a sandbox environment. In this talk, see some examples of development-level applications that can be reduced to a demonstration app for clarity, ease of testing, and of course, help with IDE sync time and build requirements. All development and demo apps are, of course, utilizing the best practices of Kotlin inside Gradle.