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As someone in the industry, the reason why there is no 'detailed description of what a quant trader does' is because it's such an open-ended problem: just consistently make money while managing risks. We buy low and sell high and there are infinite signals (of varying quality and complexity) that we find/use to determine if a level is high or low. We also answer questions of how much to buy/sell, what risks are we actually exposed to with our position, is there a good way to hedge that lowers our variance substantially without much cost? There isn't a single 'right' answer and we're given a high degree of freedom of what we can do as long as we can logically justify our decisions.