Recovering from startups, I turned towards football (soccer) analytics for something fun to do with programming/machine learning skills. I eventually got hired to spend a Summer helping out with recruitment at a football club in Europe, and the first player we signed (from a basically unknown team) became a fan favourite, and then got his first national call-up, and he went on to win a major international trophy. Can't really take credit for his achievements, but that final was the most satisfying moment of my career to date.