So far I know, You don't have to search a job. They are employers themselves. They create EB2 or H1B category job themselves with in their companies. If they can not, they will refer you to another company who will. they have kind of network around the country. They open job with certain conditions, take interviews and reject everyone except you. that is how you gonna fit in EB2 category and apply for your GC and get it with in a year or so.  

If you are trying to get into real job and salary, they will get one for you. but they charge around 10-20% our of your salary. if it is only the matter of GC - method and costs are different. if you have no work experience and no strong academic background, they will put you on a training for few months and make your resume worth of 3 years or more. they make it reasonable but you have to do good on your interview to be selected. thats the tough part.

most of these companies are related to technical field. If you are STEM student, it would be easier for them to work with you.

I do not have companies informationo handy. I may update in few days if i get the info from friends. some of my friends did this and they are already accepted for H1B and EB2 category. good for them.

good luck !!

BB