In the summer of 2012, the San Francisco tech start-up Gild offered a job to 26-year-old Jade Dominguez. Dominguez didn’t have a college degree — and he hadn’t even applied for a job with the company. Why did Gild make him an offer? The company harnesses big data to look for the Internet’s most qualified workers, rather than relying on resumes, outdated credentials, or a human resources department. As it turns out, big data thought Dominguez was the best man for the job.