[kingcub]

It's a hybrid of programmer, trader, and quant. The article doesn't mention this, but they know how to program and how to trade. They come up with, code, and write the algorithms. At a prop firm it is usually used by a desk of clerks / traders at that point, who tweak dials on the software depending on market conditions. It's a lot more than just writing code. Going the startup route requires adding on the businessman, sales, negotiating hats as well as taking management of the desk and the traders / clerks. It's a not a trivial step by any degree, however compared to the value the trade developers are adding to the trade versus how they are being compensated, some how been willing to take on that extra burden to get a chance at a better deal.