In October we have released a completely new type of tasks in Codility Library that resembles the daily work of developers even better. We call them Project tasks.
Project Tasks have natural, multi file project structure, which replicates pretty closely things that developers do in the daily work (which means working with complex codebase and applying changes by adding/refactoring a lot of files with every change).
Project tasks will allow you to gain new insights when testing Mid/Senior Developers. You can read more about these tasks here.
If you'd like to give us feedback, contact us at firstname.lastname@example.org.