The mechanism of improving the efficiency of human resources management at IT-companies updates the implementation of innovative management tools in the processes of hiring, developing, and evaluating their employees. The goal of the work is to deepen the theoretical and conceptual foundations of the effectiveness of HR management at IT-companies in the social and labor context and to develop scientific and applied recommendations regarding the mechanism of its enhancement in the conditions of formation of a new economy. Measures outlined in the paper to apply the competency approach, to introduce the talent management algorithm on a systematic basis, and to develop the system of key performance indicators should be considered as a component of scientific and practical recommendations for improving the efficiency of human resources management in IT enterprises in the social and labor dimension. In order to improve the efficiency of human resources management at IT enterprises, it is necessary to develop and introduce a perfect mechanism as a systemic integrity of economic, social, and organizational processes of creating preconditions for innovative development of the enterprise as a benefit for the employer and decent work as a benefit for the employees. The scientific platform of the theoretical and applied construct of such a mechanism should be the managerial paradigm of harmonization of social and labor relations, and its internal architectonics should be formed in compliance with the values of corporate social responsibility and contain innovative tools in the format of the goals and results management system in contrast to the functions management system. On the basis of understanding of the essence and regulatory consolidation of competencies as the ability of a person to perform a certain type of activity, the model of functional and behavioral competencies of the IT project manager is developed, the trajectory of development of talents in the field of computer programming is given, the methodological basis of construction and the algorithm of development of the key system are developed and performance indicators are implemented.