Ask HN: Devs who don't use GitHub, what do you use to share your portfolio?
Something like Dribbble or Behance for developers..
I put code on GitHub on the off chance someone else will find it useful or informative. Between the user base, platform usability, and the fact that I use git anyway, it's convenient for that. But "portfolio" isn't really a consideration.
If, for some reason, you want a portfolio anyway: my recommendation would be private website + GitHub. Preferably, in the form of writing an article demonstrating why a given project on GitHub is novel or interesting or useful. If you go that way, any off-the-shelf blogging tool should work (e.g. Jekyll / Octopress + GitHub Pages), and it will tend to be more useful to the community as large (which increases the odds of other devs explicitly being interested in working with you).
It appears you have a good skillset--I hope everything works out.
Or, to reference an old magazine cover, is it more of a "View of the World from 9th Avenue" thing? FWIW, all of my code is on Bitbucket.