- as I'm pretty vocated to functional testing, how can I grow as an application testing specialist without getting too much in technical details(aka programming and white testing)and "remain" on the functional side?
You know, being critic, logic and curious is essential to a tester. But all those quality are not certified on a piece of paper.
And paper count (unluckily...)
So a certification, to me, is something essential to be considered a "real" professional in functional testing.
Just like a QTP certification (or something similar) is essential to be considered a "real" automation testing specialist.
If you search thses forums you'll find a bunch of discussion on certifications. From an overall view, most people think they are worthless, but some say they are better than nothing and can't hurt. I go with the latter. Bru's ISTQB Advanced Level Functional Tester is probably the best suggestion in your case.