[nottorp]

Just mapping the whole codebase without a specific goal in mind seems counterproductive to me.

Instead, I get myself a couple specific tiny bugfixes/features to do first. Just finding out where those are, one by one, tells you a lot and may not be as simple as it sounds.

I was once hired to help with polishing a code base for imminent shipping. I fixed one bug. The fix was one line, but not trivial at all. Took me a whole week of reading code. The customer was extatic. There were like 12-15 years worth of layers of code to read.