Purpose: The purpose of this paper is to focus on how adopting technologies impacts employees’ job performance and well-being. One such new job demand is the use of technology-based knowledge sharing (TBKS), which has the potential to influence employees’ job performance and well-being. Therefore, human resource managers must provide resources that facilitate the adoption of TBKS to improve job performance while minimising mental health effects. Design/methodology/approach: Guided by social capital theory, social exchange theory and the job demands-resources model, the authors analyse survey data from 281 Vietnamese employees. Findings: The results of this paper show that TBKS influences employee mental health and directly and indirectly affects job performance. The authors examine the moderating effects of training, transformational leadership and organisational resources on the relationship between the new job demands of TBKS on job performance and mental health outcomes. Practical implications: TBKS platform developers should offer user-friendly interface functions and extend critical features. HRM should communicate more with employees, care about their well-being and consider their goals and values. HRM needs to provide training to help employees adapt to organisational changes. Leadership also needs to make employees perceive that organisational success is closely related to the success of TBKS. Originality/value: This paper draws upon the three fundamental tenets of three theories as a triangular base to examine the relationship between TBKS and its outcomes. This paper contributes to the knowledge management literature by delivering a comprehensive understanding and demonstrating how the inclusion of technology in knowledge sharing and human resource practices can impact employee performance and well-being.