Right. All my best code (and worst, of course) is owned by my employer and former employers, and is usually exclusively licensed to their customers.

I tend not to code in my off hours any more, because I have different interests now, that require the expenditure of leisure time to enjoy. If I do, it is to solve an immediate need or as a side-project to make money directly, rather than to maybe get another job in the future.

If you want my portfolio, I want to browse your defects database and code repository before we interview.