The article undertakes a phenomenological reconstruction of the career path, transcending the traditional existentialist opposition between authentic existence (Dasein) and impersonal social being (das Man). The aim of the research is to demonstrate that das Man functions not as an antithesis but as an ontologically primary foundation and an essential semantic resource for the subsequent development of authenticity. The methodology encompasses a hermeneutic analysis of M. Heidegger’s key concepts, their projection onto the classical model of career stages by D. Super, and the application of the phenomenological reduction method to the experience of professional socialization. As a result, a three-stage model is identified: 1) primary assimilation of the world through das Man (Exploration, Establishment); 2) a crisis of alienation as the discovery of the limits of the assimilated horizon (Maintenance); 3) secondary appropriation – the transformation of the material of das Man into a conscious Dasein project (Disengagement). It is concluded that authenticity is not an initial state but the result of a reflexive transformation of socially given structures, and that mature subjectivity represents the ability for authorial mastery of the initially alien language of professional roles and practices.