The more senior you go the less it matters. At senior positions your architectural understanding matters more. If it's a junior position then all depends on the

The more senior you go the less it matters. At senior positions your architectural understanding matters more. If it's a junior position then all depends on their willingness to train you. Basically if they want someone to crank out code tomorrow, they probably won't hire you. If they just happen to use ROR and want you to architect the cloud backend of their technology then they shouldn't care so much. But all in all it never hurts to try! :-)