Short answer: the T&C's are crap. Have seen them myself when applying for this 717/319 PIC gig.
Forget it. Start, typical italian(even that they are spanish), on some crap part time contract(8 months) on lousy pay.
Of course you start on 717(such a useful rating) because they upgrade all their current drivers to 319. Then a couple of years 717 till eventually you might fly the not so shiny 319 eventually as well.
All in all a bad deal, I went to RYR instead.
Good luck. Good chances to get hired thought, they seem really(really, really) needy(got invited immediately after sending my CV for the week after which made me investigate).