This is crazy! Comparing Florenica Antara's photo from her TopTal page (http://www.toptal.com/resume/florencia-antara) to the one they posted you can see that they did use the more glamorous image (or she provided that one to be used). So what! Using glammed up photos is standard professional practice. The photo they used is not sexy or exploitative any way.
One argument against it (as pallandt mentions) is that such people are outliers, i.e. it's probabilistically unlikely to have a female developer dressed in that outfit. Apart from the fact that this hypothesis is scientifically untested (there may be some truth to it), how does it make it any different than, say, the other practice of using "she" to refer to a common coder (the chance of a randomly picked programmer to be female is much smaller than male). No one I know complains about that!
One argument against it (as pallandt mentions) is that such people are outliers, i.e. it's probabilistically unlikely to have a female developer dressed in that outfit. Apart from the fact that this hypothesis is scientifically untested (there may be some truth to it), how does it make it any different than, say, the other practice of using "she" to refer to a common coder (the chance of a randomly picked programmer to be female is much smaller than male). No one I know complains about that!