Sara Golemon has posted on her blog about some jobs at Yahoo! she's trying to fill within the company. You can view a full description in this post of her blog.

Senior PHP Engineer - This is the position I'm trying hardest to fill, it's about 80% PHP, 20% C/C++ and ALL about architecting one of THE busiest site on the internet. In fact, a cube just opened up right across the isle from me! You like me don't you? (Don't you? Please say yes, my ego can't take rejection).

She also lists another position possibly available.