What kind of backgrounds do they have? CS or STEM degrees at ivy league or similar schools? Does people with liberal arts degrees and a finance MBA get those kinds of jobs? (Assuming they can program.)
CS/STEM. Need not be Ivy League but it certainly doesn't hurt-- though I know a team or two in the top tier that almost have a preference for non-ivy league :-)
To be a quantdev or quant, an MFE is far more useful than an MBA.