Nepomuk serves as a cross application semantic storage backend. It aims at collecting data from various sources - file indexing, the web, applications, etc, and linking them all together to form a cohesive map of data.
To know more about Nepomuk from a user's point of view, head over to the Nepomuk page on UserBase.
Link to the junior jobs?
IRC: #nepomuk-kde on Freenode
Mailing List: firstname.lastname@example.org