The Leibniz-Institute for Astrophysics Potsdam (AIP) invites applications for a Postdoctoral Research Position (m/f/d) in Plasma-Astrophysics for a project on cosmic ray transport in galaxies and clusters. The postdoc project will develop code, conduct particle-in-cell simulations of cosmic ray transport and plasma instabilities, and analyze them in the light of cosmic ray feedback. Previous experience in running particle-in-cell simulations and a strong background in plasma physics is a plus. Funding for this position is provided by the European Research Council (ERC) through the PICOGGAL project Mind the Gap: from Plasma Kinetics to Cosmological Galaxy Formation.