During the last ten years, the industry of temporary work agencies in Quebec has undergone an important growth; the number of employees transiting through an agency has gradually increased. The majority of these employees (42%) are young people under 30. What categories of young people transit by temporary work agencies and what is the role of these agencies in their career trajectory? This is the question the present article answers by analyzing 40 interviews conducted among young people of the Quebec region who had transited by an agency of temporary work during a two-year period prior to the interviews.