Zulily.com generated $1,800 its first day on the web in 2009, says CEO Darrell Cavens. During its 2014 fiscal year that daily average reached roughly $3.29 million, based on its yearly guidance. Zulily made its mark as a flash-sale retailer of kidswear, but outgrew that niche much as a toddler outgrows clothes; now sales in other product categories, including women’s apparel, home and pets, account for 67% of sales. A November 2013 IPO raised $253 million, giving the web-only retailer cash for expansion. “The edge of the brand stretches further,” Cavens says. How to keep pace with growth is what keeps him up at night, he says. Zulily is hiring at a frantic pace—about two dozen people weekly—and will open a third fulfillment center in 2015, increasing square footage by 55%.

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