Rapid urbanization and globalization change the old forms of social life. A modern city is presented as a space defined by routine behavioral rules. Institutional and technological changes cause increased instability and uncertainty for the megalopolis inhabitant, this is accompanied by changes in usual forms of employment in the direction of "flexibility" and therefore precarization. Precarity has become a significant feature of our society. This paper focuses on the problem of precariatization from an erosion of professional identity in conditions of frequent job changes and internalization of tacit knowledge.Tacit knowledge serves as a transmission mechanism between professional identity and position of precarity on the labor market. On the one hand, the lack of professional identity is a barrier for tacit knowledge and incorporation into a professional network. In turn, a precarit has not tacit and specialized knowledge to become an unsuccessful position. Every time he must start all over again, becoming a novice. Continuous career change does not allow to use a explicit skills and become a professional in a certain field, and as a result create a professional identity. Person flashed as a tile set in a kaleidoscope of situational techniques. And he is deprived of personal integrity in the case of non-permanent employment.