*edit* There is indeed a place already... I just couldn't find it easily. It's the Communities Jobs Corner... accessible here:
https://community.progress.com/job_corner/
I'm in discussions with the powers that be about job postings in the communities area. I haven't received official confirmation yet, but I expect that it's going to be frowned on. I will be pushing for some kind of an alternative and will update you all in here.