For many such a contract implies a step up the career ladder. However, closer inspection reveals that these contracts are quite often misused, imposing a flat rate of pay for all working hours including overtime, and avoiding regulations set in the collective agreements. It could be worth checking your contract to see if this is the case for you. This „Handbook for AT-Employees“ will help you find answers to the most important questions about your employment relationship, and where to find support should you need it.
Deutsche Version: Ratgeber für außertariflich BeschäftigteRatgeber für außertariflich Beschäftigte (PDF)