Wayfair Inc. has 37,173 kinds of coffee mugs for sale. Factor in different colors, sizes or materials, and the range of options rises above 70,000. It’s Jim Miller’s job to help shoppers find the mug they want—along with a set of espresso cups, a waffle iron or other products they didn’t know they wanted.
In the past five years, the company’s success rate has jumped 50%, measured by the number of clicks it takes for a customer to add an item to their carts and how often they buy those items, among other variables, according…
