Try here:
https://news.ycombinator.com/item?id=44434575
There is a similar thread that goes up first business day of each month so there will be a new one in a few weeks, but the old one is probably still active. This will show the archive:
https://news.ycombinator.com/submitted?id=whoishiring
I guess you could try Microsoft's code hosting site (github.com) too, since they have some kind of scheme for devs announcing their availability. I don't use it so don't know the details though.