[jeltz]

To be fair it depends a bit on the context. I present myself sometimes as a database expert and other times a Ruby/C Developer. And I would argue that I, as a minor PostgreSQL contributor who follows the mailing lists, am more knowledgeable than most about databases and especially PostgreSQL.

Edit: Admittedly while I have done a lot of DBA stuff and server operations on top of my software development, hardware and networking are not my strong points so if the company could afford it I would want a more traditional server/networking guy on my team (and at a previous job I did exactly that). And I agree their job posting seem to have a very heavy focus on development experience.