I looked at their Enterprise Agreement on the FWC site and this is the latest info I could find, for domestic cabin crew (there's a separate agreement for widebody international). Minimum salary for F/T is as follows:
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I didn't scour it further to see if there's any inflation indexation. There is also an additional $6 per hour (approx) per flying duty hour, and overtime etc, so I'm not sure what an actual average salary would be.
There's another enterprise agreement for "Team Jetstar" which appears to be some kind of labour hire company they've set up, presumably in order to erode pay and conditions compared to existing staff, so you'd definitely want to find out for certain under which agreement the job is being offered.