From day one, new hires are put to work. And they're given accelerated learning, mentorship and training programs that allow them to get promoted relatively quickly.

What's also nice? A culture where working as a team is highly valued. Take Bain's annual soccer tournament, where for the last 20 years, employees have flown all over the globe to participate in company-wide soccer games. While Bain pays to put everyone up, people are responsible for paying for their own airfare and giving up their own personal time to be there. It's a voluntary event, yet this year, 25% of the company worldwide attended.

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