I suggest you check that occupation list in your immigration package and pick up ONE for yourself. If you say last year you were Software Engineer and this year you are a computer programmer, you may screw up things. Your talk and you paper work should be consistent. Pick up a suitable occupation and defend for yourself. I myself was a physicist and all of my referees said Jabber is a world-class physicist (I didn't mention I know programming). If you were a mechanical engineer
two years ago, an instructor last year, and
a Java programmer this year, your case is
defficult to defend. Everything of you should be consistent. Otherwise, it is hard for you to explain why you changd your career... In one words, don't pull a herring in the street.
Is my voice too harsh? :-) :-)