The DevKit source code is publicly available in this GitHub repository. Everyone is welcome to fork the repository and investigate how the DevKit works under the covers.
If you find a bug or have suggestions/improvements about the DevKit, feel free to open an issue in the GitHub repository.
In case you want to change the code yourself you can send a pull request including a brief description of what the code does. Before submitting the pull request make sure you execute Maven at the root directory of the project and that it runs ok.