I hope I actually sit down and go through this because this seems like an excellent resource. I took a grad level (they just let us take them as undergrad) compilers course in college and it was the most fun I've had at Uni. It was all SML building a functional language that supported a solid type system with ADTs and parametric polymorphism and it was so interesting to see that it wasn't as complicated as it seemed to implement (although time consuming to iron out bugs).

My prof developed a production SML compiler that's fairly widely used, so he was the best resource I could have asked for. Such a humble guy as well. The thing that was most interesting to me was the use of ADTs on the implementation end. I couldn't imagine how much more tedious it would be dealing with the many types of trees a compiler deals with without them.

The class's impact on my overall career isn't direct, as I don't work near the compiler space at all (unfortunately), but there were so many good type level concepts I got out of that course. Plus, it was just a blast. Late nights with a bunch of tmux panes ironing out bugs to rack up test coverage - such fond memories :)

I highly recommend playing with compiler implementation for anyone that's unfamiliar. There are a lot of good introductory resources out there and they're just such a fascinating part of our industry. A beautiful cross roads between CS theory and practical application.