[kisielk]

In our case our company is in an industry (biotech) that traditionally doesn't seem to attract a lot of developers. Most of the developers I know in my network are either game or web app developers.

When we have openings they're usually reluctant to apply because the positions normally benefit from a solid math or sciences background, or they'd rather be working on more general-purpose software than that used for drug R&D.

That's mostly why we use job posting sites and we've actually managed to find solid team members via StackOverflow and some local job posting sites.