The professional development of teachers is carried out for the sake of continuous progress in the level of their professional, pedagogical and technological competencies. In contemporary conditions, it is considered that technological competencies of teachers are their capability to prepare and realize teaching in an online environment, which can be an addition to or an option of teaching in the classroom. The School of electrical and computer engineering in the Academy of technical and art applied studies in Belgrade is one of the partner institutions of the Erasmus+ program „Professional Development of Vocational Education Teachers in Russia and Serbia with European Practices Pro-VET“ (2018-2022) with the goal to develop the training program „Online course design and tutoring“. In this paper is a short overview of the above mentioned training program, which was developed (2018-2019), redesigned based on results of alfa and beta testing (2020-2021) and realized twice (2022). In the paper is a brief presentation of the following: an overview of the training program, methods used to motivate teachers to enter the program, work on it and successfully complete it, teachers’ achieved success in the program and their grades for the quality of the training program.