I contracted for 6 months for a hedge fund where I essentially proved that technical analysis is hogwash. The owner had some significant of money (think $100 MM) in this game, paid some $2MM for developers to develop a platform to test his trader's ideas. When I arrived at the scene it was completely nonfunctional, took 2 months at a $5000 / month rate to put it up and running and another 4 to make it obvious that TA is just them "traders" guys ripping him off. Guy kept saying "but we made a lot of money in the 2010-2020 interval" (met those "traders" in 2010). Based on my analysis, when accidentally due to a Fibonacci crossing with an Elliot Wave the "algorithms" would buy and then due to accidental inputting 50% instead of 5 or 500 for stoploss (by a 10 years old seasoned "commodities" trader who was still shockingly surprised to see their prices get backadjusted like stock splits when I talket to her), it would hold. Hence making some money in the bull market. But not anymore and reason I'm kicking myself in the balls is letting go so fast on a sucker. In my defence I only knew on how unbelievably much he spent on the crap system after he fired me (and the whole European team) for making the crap system work and tell the uncomfortable truth. Kept the Indian palm-readers though. Well, lesson learned.