[lastofus]

Something with a vibrant community built up around it is most impressive to me. It shows a degree of communication and management, not to mention marketing.

Otherwise, most github repos are not that impressive as I have no idea how long it took to write (did it take a few months to write something most devs could write in a few days?), or if the candidate even wrote it at all.

[lj3]

> It shows a degree of communication and management, not to mention marketing.

Which is important when hiring a programmer who won't be managing anybody or marketing anything.

[lastofus]

The question was what I find most impressive in a portfolio, not what I require in a candidate. "Soft skills" on top of good engineering is extremely impressive.