Writing API docs, user guides, blog posts, how-to guides, etc...
Pay is usually less than dev but still high.
Process improvement (a ton of overlap between the ideas here and with program from a general systems perspective).
Some management roles (advising at the C-suite level, or running teams but not coding anymore).
Instructor (using expertise to teach within your current org or at schools or professional training companies).
Technical writer (if you have the writing chops or can develop it).
The career progression isn’t great. Basically it’s just management, EPM, or back to SDE.