As long as you hung around long enough to figure out how to work with difficult people, and learn how your design decisions and code actually run in production (ie: you got to fix your own bugs) then you probably didn't miss much. I worked with one person who had an impressive string of senior roles at big companies, but my personal experience was that they implemented a dumpster fire using the latest hot new thing, and quit after it blew up production a few times.
