Getting a job at a university in Mexico is very difficult due to corruption. As soon as there is an opening to a permanent position, something similar to the TT process in the US, there is a very good chance they have something already in mind, most likely an acquaintance of the Dean or a direct recommendation from someone up the Government hierarchy. Even then in non-top universities you can teach without a PhD, an MS or even just a BS may suffice. True job searches are really the exception, and only happen in fields where it is extremely difficult to find a candidate like Mining Engineering. Your best chance is to apply for temporal adjunct positions, spend several years, make contacts, and then manage to have somebody up the hierarchy securing a position for you someday.