Thanks guys for your answer, is very clear now.
@inane.imp I forgot the hazard a career :-), and thanks for answering my questions one by one. @Chronic, maybe as I came from the wargame I have the idea that hacker is a career (a specific profile in several troops), but you are right, as mention in my previous comment, during the creation of character many professions can have the hacker skill and other have access to hacker devices too as other skill related to hacking. finally, I’ll look for supplements to have more hacker divices options.