Hello Kostia,
You have two options when developing an interface to be delivered in the mobile application. You can write in our Caliper SDK and Tecton which will deliver HTML5 content in our native mobile application. This is an easier and quicker way to deliver workflows and interactions in our Desktop and Mobile applications. The second option is to write Native mobile application using our Mobile SDK. While this is a little bigger effort, it allows for use of native components that aren't already exposed in our native application. Almost all net new workflows our customers and third parties develop are written in the Caliper SDK. We only have a few partners that have needed native development. Hope this helps.