What language is this coded in (btc sportsbook/casino)

[TipTopBet]

What language is this coded in?

By example,

Directbet.eu
Nitrogensports.eu

I am looking for a freelancer who can work for me, to code a website like this. But first i need to know what it's made in, so i know what kinda web designer i need to look for.

What kinda skills does he need, to make something like this?

Thanks in advance