When I go to my user page and click on one of the tags, I get a search result for all questions/answers I've written for that tag. But they're sorted "oldest first" by default.
The tab that's selected by default is "relevance", and I don't think, that the oldest questions are most relevant - are they?
I don't like that default very much, because if someone searches for the answers/questions of a user about a specific tag (which a potential employer might want to do for example), they primarily find their very first posts - which are often not as good as they could be...
So I would recommend to either reverse the sort order, or to set the "newest" tab as default.