Why is a Senior iOS engineer (Andy) on a "Intermediate: 1.1X" multiplier? - you can't be Senior and be intermediate in my book. Seems he needs his multiplier upped to the proper level. $107k is low for a iOS Dev in the Bay Area.
So an ios dev who spent the last 10 years elbow-deep in the innards of some database code or something would arguably be "senior" but not "experienced".
Just one way this could fall out, I don't know how buffer defines the terms.