> At a 20-person venture-funded company, there isn't much choice of work to do, and there isn't much room to move or grow

This is kind of the opposite of what I've seen reported around here.

Small startups, they say, are exactly where you should work for a while in order to grow and develop a lot of new skills, which are then valuable elsewhere.

Meanwhile a number of people at large companies report being bored at work.