> She and I agree that everything past a senior engineer is political

At the big tech company I work at, we're often told that even even senior is primarily a non-technical designation. Technical expertise and independence is expected of the level below senior, and in order to make the jump to senior you need to demonstrate leadership and other for skills - influencing others, project management, coordinating between teams, etc. Principal is a level above that that is kind of the same but more.

All this to say: every company is different.