The study of students' personality traits is a fundamental element of psychodiagnostics and is of high practical value; potentially, the individual characteristics of adolescents have a certain influence on their choice of future profession. The study of this aspect is a multi-component process, but with the use of digital tools can become more effective and efficient. The scientific significance of the article is related to the study of the relationship between personal characteristics and professional development of students, supplementing modern pedagogy with relevant ideas, practical - with the optimization of the practice of psychodiagnosis of children by means of digital technologies. The aim of the study is to analyze the peculiarities of using SMART platform as a way to ensure the implementation of personal diagnostics and identification of professional preferences in high school age students, search for interrelationships between individual characteristics and the propensity to choose a field of activity. To achieve the goal we used the methods of content analysis, synthesis, generalization, correlation analysis, survey, method of mathematical statistics. Questionnaire survey with the help of SMART platform was realized using questionnaires that allow assessing personal characteristics and professional aptitudes of pupils. SMART platform allowed obtaining accurate and relevant assessments. SMART platform allowed obtaining accurate and relevant assessments. The statistical processing of the data explored students' personality differences, and correlation analysis confirmed the existence of the influence of personality traits on professional aptitudes. The practical value of the work is due to the analysis of applied aspects and consequences of using SMART platform, which is the basis for improving the online resource and its wider implementation in secondary education institutions of the Republic of Kazakhstan in the context of optimizing psychodiagnostics and career counseling of students.