The article presents results of the analyses of aims, motivations and meanings of social communicative competency and expert knowledge of junior scientists and professionals in scientific occupations for sustainability. The contribution identifies relations and influences which affect people and their possibilities to reach top positions from the perspective of gender. This reveals gender differences between professionals and junior scientists which can affect their further career. It refers to the relationship between expert knowledge and relationship-orientation and between private and public: Professionals instrumentally raise the issue of sociality in an attempt to expert knowledge. Junior scientists transfer relationship-management in the focus of their working contexts. They construct a specific relationship between employment and privacy which is self-selected and powerful in contrast to the professionals who focus on employability.