I've worked here for 3 years and there are a lot of women working here, but predominantly in support roles. Generally I believe they are treated fairly but management is male-dominated and not diverse, which makes it tougher for women to "network" with them and get time with them.
Younger men in support roles often challenge/push back on the women they work for in a way that they do not with the men they work for, and management isn't particularly open to hearing this feeedback.
I've worked at Goldman Sachs for close to 12 years in a revenue producing role. I think there are incredible opportunities for women ( and men ) to excel. If you don't have the goods, you won't be successful on Wall Street, no matter if you're male or female.
I worked here over 15 years. The pay is good but the hours are steep, i.e. you pay a price. Everybody is smart so be prepared for a stiff competition. Atmosphere is collegial with men socializing without women, so you need to have confidence to speak out.
They have pretty good programs for working moms such as on site lactation center, on site backup daycare, flex work arrangements and etc. however people are very demanding and work gets quite stressful so often that you can't really have work-life balance. It's constantly skewed to work if you want to be successful in this company. If you try to have work-life balance here, you will have bard time keeping up with the work load. I manage to leave the office "early" at six o'clock but end up either working my blackberry constantly or log into work at night.