Based on the feedback that we've received, we've made some changes to the Candidate User Interface (CUI).
Our new CUI now resembles more closely standard IDEs that are used by programmers in their daily work. You can see how the new CUI looks like below:

Here are the key differences between the old and new CUI:
- there is now a file path tree in the middle of the screen - which allowed us to introduce Project Tasks
- custom test inputs are now a separate text file
- "Run Tests" button has been moved under the solution, away from "Submit Task" button in order to prevent accidental clicks