Goldman Sachs Desk Strats (Equity Prime Service)?

Have an upcoming interview for the Desk Strats/Quant Engineer at GS security->equity->PrimeServices division. Given the diverse responsibilities of GS strats, does anyone knows what kind of work they do and what kind of quant skills this role will likely requires? It seems that Prime Service means Prime Brokerage Service for institution clients. Does it mean the strats in that group focus more on software development (eg. Developing trading platforms) or math modeling (e.g. analytics, risk/cost analysis)? They told me the 1st round of interview will involve coding/algorithm questions, but I am not sure if the equity group typically put emphasis on probability/stats questions as many common quant interviews require? Any information or comments would be greatly appreciated. Thanks.