The article presents an analysis of domestic research devoted to the problem of the development of transfessionalism for engineering specialists. The acceleration of scientific and technological progress, the introduction of innovative technologies lead to a process of constant need to increase professional knowledge, the development of new competencies, often from completely different professional fields. Therefore, it is important to understand the mechanism that ensures the development of transfessional — occupational mobility as a significant personal characteristic that ensures the projective management of one’s professional development and transformation of the professional environment. Occupational mobility acts as a mechanism of transition from the level of a professional (a specialist with competencies within one profession) to the level of a transprofessional (a specialist with competencies in a number of related professions), and subsequently — a transfessional (an expert of a supra-professional level synthesizing competencies of completely different professions in his professional activity) The article discusses the theoretical aspects of understanding the phenomenon of professional mobility and its essential characteristics. Considerable attention is paid to research aimed at studying the psychological prerequisites for the development of occupational mobility, and prospects for further study of this phenomenon are outlined.