The “Referendariat” is a qualification for a career as academic librarian in the civil service. Generally, the Herzog August Bibliothek Wolfenbüttel offers one position each year. The “Referendariat” in Lower Saxony lasts two years and consists of one year training-on-the-job and a second academic year. The administrative authority for the “Referendariat” at academic libraries in Lower Saxony is the Centre of Education and Advanced Training (Zentrum für Aus- und Fortbildung) at the Gottfried Wilhelm Leibniz Bibliothek Hannover.
You’ll find detailed information about application requirements and the training program in Lower Saxony here (only available in German).