Google

The benefits are great, the culture is great, and the technical challenges can only be found at a handful of places on earth.

There's a very deep org tree, and half of the people between you and the top are not managers first. There's also an annoying culture of entitlement, especially among some of the people who were recruited straight out of college and take the perks for granted, but it's easy to avoid.

More training for low-level managers.

It's clear that the training works, but there are many things that experienced managers do to help their reports that don't occur to someone who just stepped up because their group got large enough to need a split and additional managers.