I wondered if this was legit, but Google's cached version from 2 weeks ago also mentions the programs, and I'm not sure if the name "XKeyscore" was publicly known back then. If so, kinda nuts that a handfull of top secret codenames made their way to a Blogger job posting website.
It's interesting to see what kinds of skills they were looking for.
Additionally, if you Google the phone number listed as the contact for Athena, you come up with a whole slew of job listings for seemingly related jobs. It seems a lot of subsidiaries with generic looking web fronts use that phone number.