I second your opinion (interned @ Athena, not Quartz) - compared to my current BigN experience everything was worse by a magnitude: the IDE, the source control, the review mechanism, the job scheduler and so on.
I'd expect with so many devs working on this the DevX will be ironed out
I assume you are open to hiring EU/EEA candidates too, correct? (ones who will need Aufenthaltsbewilligung)