>> As a database specialist not only will you work on the database, but also the application's usage of the database. As a result a significant amount of experience with both Ruby and PostgreSQL is a strict requirement.

This is a mistake. The number of DBAs who are good with postgres is very small compared to something like mysql. The truly talented pool for such a position is too small to expect them to also be a developer. The very mention of terms like "ruby" and "programming" should be removed from that job post. It's not a realistic expectation.