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.