Uber

It's not like Uber is some sort of charity, but we still feel like we're affecting the world with what we do here. In a city like San Francisco, where it was nearly impossible to find a taxi cab in the past, democratizing the transportation landscape is incredibly exciting and fulfilling.

The great news is the work environment is also game-changing. Everyone is working hard, towards a purpose that goes past twice-monthly paychecks.

There are growing pains, absolutely. With a seemingly never-ending customer base that grows by the hour, keeping our systems up to date and working correctly is a challenge. When new initiatives are pushed through, the workload can be a bit taxing.

Keep hiring engineers. The teams you've created are working wonders, but there's a potential for people to get overworked. Otherwise, keep doing what you do. The culture is great, and clearly this is a service people are excited to use.