I came with a tourist visa. My permit expired june 19, 2006. I went to high school here in Houston and went back to Mexico to go to college.
The company can try to sponsor you. You job seems like one that a lot of americans can do, so it may be hard to get a labor cert. The process takes about 4-5 years and if you are not legal the whole time you need a law change before you could do the last of the 3 steps. You would not be legal until you could file the last step. If the law does not change you would not be able to get a green card through it.