What do these guys do?? it says here that they are...

What do these guys do?? it says here that they are a software company but they have been emailing me with job opportunities. I received a call from a recruiter about an opening in San Francisco. The recruiter had asked for SS, birthday and other personal information during the initial call! Really shady! i dont think this company is legit. If they are then they have violated a lot during the phone call asking my visa status because my name is Latin! Scary phone call all in all!