I have a shipping product I worked on for 12 years and that is used all over the industry. I have a public mailing list you can search where I answered questions from developers about the product during that entire time. I have a profile on some well-known programming web sites (like Stack Overflow, etc.). I have a degree from a well-known university and actually have at least 1 paper listed on Google Scholar. I still have had to do stupid whiteboard programming exercises of 1st year data structure and algorithm nonsense.