I will be owning the Source of code once it will be developed.

The system should consists of three elements:

1) Client web application (js, jQuery, vis.js)

2) Server(node.js)

3) Android application (Kotlin)

According to the requirements, the web application must be able to create and edit the course markup graph and get the JSON-generated template, and the Android application must display and store courses on the resulting template. This means the following:

Web application:

1) Create, delete, and edit vertices in a graph and create links between them

2) Transmit the generated data to the server

3) Generate JSON file using the created markup

Android app:

1) Display lecture material and assignments

2) Get information about whether the current topic is available, and if not, what topics it depends on

3) To find out if the task is correct and to be able to solve the task again

4) Have the ability to pass adaptive simulators, and mark tasks as "simple" or "difficult

5) View course progress

6) Also, the Android application must have the ability to register and authorize on the Stepik platform.

Cheers