Anyway, back to topic..
The MOE always do a lot of advertising.. giving impression that they need teachers.. In reality, I guess, they have no lack of candidates.. Coz I'm aware of many professionals who attempt a mid career switch to teaching but not accepted by MOE.
By some automation selection program or something like that, Almost all applicants will be granted an interview, so long as they hold a degree. But going to the interview is different story. No sure what they're looking for actually. My friends with strong passion for teaching and have many years teaching experience as private tutor were also not accepted.
Maybe it's different in the field of arts..