Mieszko Grzeszczuk
Mieszko Grzeszczuk voted up Jann Nikka's answer
So i'm going to be getting a job, I need help with one thing, am I allowed to use my preferred name on a job application or legal name (also how do I make it so the managers or the people working there call me and know me by my preferred name?)

I always followed Happy's advice.

And as I introduce myself.  First and last name. If its ok people call me _______. Thank you.

Mieszko Grzeszczuk
Mieszko Grzeszczuk voted up HappyTo BeHereTo's answer
So i'm going to be getting a job, I need help with one thing, am I allowed to use my preferred name on a job application or legal name (also how do I make it so the managers or the people working there call me and know me by my preferred name?)

Good for you! I always wrote my legal name on the forms.

First Name:  HappyTwo  Last Name:  BeHereTwo

If a place for your preferred name isn't provided, you can write it parenthetically.

First Name:  HappyTwo (Happy)  Last Name:  BeHereTwo

or just verbally introduce yourself that way. 

Good luck!!!