For further details see here: http://www.socium.uni-bremen.de/ueber-das-socium/stellenausschreibungen/de/?block=215
My usual caveat applies: I am more and more worried about the sheer quantities of PhDs produceed, especially in the German system. Instead of permanent, stable positions, much of (excellent) research is financed by temporary projects implemented through PhDs and, to a lesser extent, PostDocs. This is not a sustainable model, even counting that some people use their PhDs for pursuing careers outside academia.