In political sociology, identifying the social spaces, interpersonal networks, and specific temporalities of political socialization is a challenge. Certainly, some of the groundwork is laid by the diachronic distinction between primary and secondary socialization, via the role of interpersonal networks and institutions of reference: family, school, peers, couple, friends. However, the place given to work in this perspective has remained insufficient: for a long time, the study of work was subsumed by the analysis of socioprofessional categories and class voting, and work itself was consequently relegated to the background, probably owing to a renewed interest in primary socialization and commitments outside work. Furthermore, it is methodologically difficult to find stable quantitative correlations explaining the relations between work and politics. As a result, levels of educational attainment, employment status, and autonomy at work have been taken as less significant variables than the “values” and “skills” attached to a professional activity. This contribution therefore proposes to consider the professional sphere as an “elementary framework,” continuing from work that analyzes the role of “the everyday and the instituted” in individuals’ ordinary relations to politics. It aims to understand the processes by which individuals who are members of the same professional group—in this case, engineers—“subscribe to this or that vision of politics, the authorities, the state,”…