Apps that combine React Native with a native code become more popular every day. Large companies (including Facebook), deploys functionalities of their products written with React Native on a daily basis. In order to do it conveniently, developers are required to understand the architecture of navigation in React Native and compare it to a pure native approach. This presentation is a perfect opportunity to gather some high-level overview of these topics, and it's a must-have to develop your first "brownfield" app.