Ask HN: Examples of well-designed highly-configurable user account UIs?

I am currently creating a notification aggregation service where users have a bunch of configuration options which determine which notifications they will receive. I am struggling to keep the UI clean and intuitive as I have to cram so much in.

Does anyone know any examples of highly-configurable user accounts in some website where the UI is still simple and intuitive? Free or paid, I can sub for a month to check them out. Thanks.