Why did you pick Toptal? From those numbers, their technical people are grossly underpaid. $85k/year for their Director of Engineering? That's laughable.

Toptal gets away with massively underpaying Sr Devs by hiring them from relatively cheap countries where that money goes a long way.

A US-based Sr Dev contractor working remotely, making 75/hr, is being massively ripped off if they're capable of working with any even remotely commercially viable technology.

I think the numbers on Glassdoor are representing actual Toptal employees, not their contractors.

Could be, but if so their employees are insanely underpaid