Try Cataldo, they are always hiring, it's a bit of a process, prehire testing, interview, etc... but they pay one of the highest rates in the state and treat their employees well.
EasCare and Alert hire quite often
Fallon has had a hiring freeze for almost a year at this point, AMR too...
Alert you'll do a lot of VA-VA calls, EasCare is NH, Dialysis and Discharges, Cataldo depending on what division you end up in can end up doing a good ammount of 911, or IFT's and discharges all day long.