A visit to Groupon’s Chicago headquarters yielded some interesting insights into the company’s approach to software development, and how it scouts and hires talent. Among the brief tour around the building, this CIO.com writer finds out that Groupon has about 800 software development employees, with about 300 of them in Chicagoland. “But that’s a hard number to pin down, as we grow by an average of 150 people a week,” said Julie Mossler, Groupon’s director of communications. Groupon looks to hire software developers who are passive, meaning they’re happy where they are but might be happier at the daily-deals giant. (CIO.com)