Big bank is not the same as a small/mid sized trading firm. Banks have regulations they need to meet, and typically do things by the book. I'm not an expert he

Big bank is not the same as a small/mid sized trading firm. Banks have regulations they need to meet, and typically do things by the book. I'm not an expert here. Part of what I said is based on the 6 different people I've met who have worked in the industry. I'm just saying if you have $400+ million to lose and you rely on the IT infrastructure allows you to make that money then you can spend a few million on top notch people and processes to prevent this kind of thing. I worked at a relatively large media company, and every deployment has a go/no-go meeting where knowledgable professionals asked probing questions, you defended your decisions. I've love to know what they did in Knight Capital. The idea of re-using an existing variable for code that was out of use strikes me as a terrible idea.