When I was looking at other people's github accounts during recruitment, I didn't care what the code is for. People have different interests - games, web frameworks, fun research, anything... As far as I was concerned, all that mattered was: does it look usable, does it follow any conventions/patterns, is it made to be used by others. I didn't care how advanced it is, how many features it has, most likely won't even try to run it - I just care whether the author cares.

For example if someone published a library that they expected to be used, there's a whole spectrum of quality. On one end there's a dump of messy code that's not even indented properly with a single commit "Done". On the other there's a project with a proper license, documentation, version tags, "how to use", potentially some travis-ci integration and other source code scanners.

Examples:

- throwaway project I don't care about: https://bitbucket.org/viraptor/cmv_encoder/src

- (mostly my) proper project I care about a lot: https://github.com/openstack/anchor

So I guess my advice is - just do something you actually care about. If it's only for people in your field - great!