I applied in-person. The process took 4 weeks. I interviewed at Copamex (Coyame Del Sotol) in Nov 2011
Interview
First you shold sen your curriculum, is better if you can obtain not only the e-mail official but also the personal e-mail. If the company is interesting on you, they will contact you to have a interview, where the will explain details obout the job, on that point you also will have test about your IQ and abilities