What language cPanel/WHM panel server is done?

I am planning to make an application like cPanel/WHM in perl since i never worked out my own server in perl, and i was thinking of a few points that i wanted some advices/help:

• cpanel and whm work on ports 2082/3 and 2086/7 to server their panel i was wondering in what language is their server done or if there is a nice module for perl to hold a webserver like that ?

• from what i know cpanel/whm run as root what should i keep in mind while making my own server to handle my panel while it runs as root ?

• if you know of any open source USING PERL that is on this route i would like to take a look at it.

If you have any other advices related please feel free to drop your comment.

Best regards;