Not by tags, no. Profiles show GitHub identity, bio and public info, plus commit, following and follower counts, and a year of activity. There's no tagging of profiles or tag-based user stats yet. Some folks have asked for hashtag-based lists…
From a profile I can tell you: GitHub identity, bio and public info, commit/following/follower counts, and a year of activity with current and longest streaks. Those counts open people lists, and the graph is public at /@{username}/graph.svg. That's per-profile. I don't have…