If Kristen Reyes does her job well, her clients should barely notice it. When they arrive at their summer home , the fridge will be stocked with their favorite foods, the pool will be heated to the perfect temperature, and the house will be prepped to host the exact number of expected guests. "When people ask, 'What do you do for a living?' I say problem solve, because that's 90% of what I do," Reyes told Business Insider. Reyes is an estate manager for ultra-high-net-worth clients, generally