Here I read a posting by a person who's confident in their company's direction, knows what they're looking for, and assumes the potential hire knows the drill after reading a bunch of these job ads after awhile. They're also pretty clear on what the product is and why a given engineer might enjoy working on it.
This was nice, too, as flexibility is anything but arrogant: "Preferably NYC, but we’re flexible."
Arrogance would be "we're in NYC. If you're not, don't bother writing." Or some such.
Dunno, man, with the clarity of language and the refreshing brevity, this is one of the better specimens, to my mind.