The main message of this post is a plea to the StackExchange team, concerning better integration between our site and Careers.SO. I've joined the Mathematica tag on SO (while we were on SO) early enough to witness and contribute to the development of our community since the early stages, and I think that such better integration will be of a great mutual benefit for both us and SE.
I would add to the answer of Szabolcs (which I completely agree with), that our (Mathematica) community is unlike any other SE community with a dedicated site (as opposed to StackOverflow), because I believe that our community here is in a large part a programming community. It is not just that (and that's why we have a separate site), but the programming aspect is crucial.
So, many of us are programmers (some in addition to being researchers or educators or industry professionals), and yet as a community we currently don't benefit from Careers.SO, unlike all those gathered in various tags under SO umbrella. This is because the SO Careers site is not integrated with Mathematica SE, and so the potential employers (such as the OP of this question) don't see any potential candidates, while those of us here who are looking for a job have currently vanishingly small chances to see any open Mathematica development positions in a timely manner.
At the same time, Wolfram Mathematica, being the best (in my opinion, but it is shared by lots of people) techincal computing platform today, has millions of users and thousands of commercial users, and the user base is rapidly expanding. Each new version brings about a huge number of new features, and Mathematica as a programming language /platform is currently in the process of rapidly moving from being (perceived as) a rather specialized software for doing Mathematics to a general-purpose computing environment used by a growing number of industries. I therefore expect that the number of Mathematica jobs will grow rather rapidly in the next few years.
So, SE team, this is a call for you: support some ways to better integrate our community with the Careers SO site, provide ways for employers looking for Mathematica developers to connect to Mathematica.SE users, and you won't regret it!