> Chemical engineers must, on average, complete 15 hours of technically focused continuing education courses each year. State requirements vary, and some also require courses on ethics, state engineering laws, or professional behavior. Acceptable formats include online courses, live webinars, seminars, and college courses.
So while the PE doesn't have a personal portfolio, they do have a professional one, the tests that they've passed to reach that and the continuing education completion certificates.
The "do things at home" is a way to get a similar type of value as the PE has for continuing education... but not as any formal way of stating it because software development hasn't come up with a good way to do licensure.
So, for all those other technical, scientific, medical, and yes, business fields (the 'C' part of a CPA) which do have licensure, this is a solved problem.
Continuing education is a bit of a joke. So you attend a conference once a year, maybe watch some webinars. In general, PEs mean you've gotten an undergrad degree, passed a couple of GRE-type tests and have worked in the industry for a few years.