You’ll find few complainers at this ad-tech firm, whose software aims to boost digital advertising campaigns: 95% of the company’s staff say they’re proud to tell others they work there, and just as many report feeling like part of a “family” or “team.” More than half — 53% — of Centro workers are women, who also hold 50% of the company’s management positions. All employees are also encouraged to take a 3-week sabbatical every four years. Read the Great Place to Work review.