This thesis seeks to reveal and analyze the process of deregulation of the work of social workers through the phenomenon of contracting by auction, a bidding modality practiced by the State. This is research that retrieves and deepens the initial findings of my master s thesis, entitled Societal Transformations of the work of the social worker in the order of capital: an analysis of the field of action of the CFESS/CRESS 7th Region. To this end, we present the fundamentals and objectives of the use of the legal instrument that instructs the bidding and bidding procedure and its direction for the hiring of these workers, taking for analysis the period from 2010 to 2020. We start from the understanding that the current stage of capitalist development and the consequent societal transformations have significant repercussions for the scope of work as human praxis. In this socio- historical process there is an intensification of the forms of expropriation of the workforce that are expressed, notably, through the practices of flexibility, precariousness and intensification of the forms of use and exploitation of the workforce. In this way, contracting by auction is an expression of this process. Guided by these assumptions, this thesis seeks answers to the following problem: what are the repercussions of hiring by public auction for the work of social workers in the context of counter-reforms of labor law in Brazil? What are the political responses of the CFESS/CRESS Group to tackle the situation of increasing the precariousness of the work of social workers? To understand this phenomenon and its innovation in the job market of social workers, we conducted interviews with members of the Federal Council for Social Work (CFESS) and with a retired judge from the Superior Labor Court (TST) and researcher at Cesit / Unicamp. In addition, we resumed interviews with the Regional Council of Social Service of Rio de Janeiro (CRESS 7th Region) during the research for the master s degree. In order to examine the total number of contracts per auction in Brazil, we explored a bidding search platform in the national territory (Licita Já), using the terms auction and social worker. In a complementary way, we look at official documentary sources, as well as newspapers and magazines, in addition to accessing secondary data from research institutes and having carried out a theoretical and bibliographic review on the topic. We recovered the centrality of work as the guiding thread for the analysis of this thesis, which sought, in its development, to deepen the concepts of accumulation by plunder, social insecurity and flexibility, relating them to the work of the social worker. We found that as a salaried worker, social workers are also subject to these processes, which affect their conditions and contractual working relationships and the possibilities for carrying out the current Professional Ethical-Political Project. The mode of contracting by auction and the form of labor relationship are contrary to what was pursued, in terms of working conditions, throughout the development and maturity of the Brazilian Social Service, which is the defense of contractual strength through public tender, and, notably, the statutory bond. We observed that this reframing attempt, which we call atypical work, significantly undermines the work of the social worker, has a greater incidence in Brazilian municipalities and affects public policies on social assistance and health. The centrality of this study understands that such strict injunctions are a distortion of the right to regulated and protected work and, therefore, a constraint to the labor standards and the professional project of the Brazilian Social Work.