It is a definition; the transition between the logotype and normal text has an implicit [:}, NASAFORCE: technologists inside the systems that power American spaceflight, aeronautics, and scientific discovery.

Though its an odd choice that they run it in with the paragraph of normal text rather than making that a heading. Of course, with a four day hiring window its a website that exists as pro forma evidence that there was a public website about the hiring effort, the people actually intended to be hired were almost certainly notified in advance out of band, so there probably wasn't a whole lot of effort put into this.