Work on a Game

Greetings, I've been an owner a couple years now of a game named Shaiya. I'm running my own server and I would like to upgrade it a bit. I basically want someone that has assembly knowledge and also is able to make a raid bigger. What I mean by that is. The current raid (as in party members) has capacity of 30 people. The developer will need to work with assembly and adjust it to 120 people instead of 30.