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I did a job on vWorker which was implementing a trading algorithm. The guy had a system, was using it to trade and had a paid service for people to buy it from him and had a paid subscription video channel of videos of him trading the previous day.

When I used what he thought were signals he was following (exponential smoothing, direction finding and spread detection iirc) it generated plenty of "false" trades.

It ended up he refused to pay because "obviously" my code was applying the rules wrong, not his rules didn't work.

I eventually got 50% of the fee and learned quite a lot in the process of why trading algos will struggle to work when faced with real random walks.

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