[brianwawok]

Maybe. But it is a legit chance someone wants a software engineer but doesn't want to teach an entire stack to someome.

If you coded in C for your business and two identicAL in every way people applied.. one only knew ruby and one only knew C.. which do you hire?

[mseebach]

If you ended up in that situation, obviously pick the candidate more familiar with your stack, but that's a hypothetical, hiring in this business is not generally characterised by a glut of qualified candidates.