I have just completed this.

http://www.workerscheduling.com/

My part is not the web or design, but the very logic and the programming of the engine behind the scene.

With our older, now pre-modern version we have just managed to schedule a bigger international dance week event. Much better than it was possible before by human intellect power. Despite, that (some) humans are surprisingly good at this.

In short:

https://protokol2020.wordpress.com/2014/03/08/woshi-ii/