Despite growing body of research on employee well-being during the global crisis of Covid-19, there is a lack of research that empirically examines its antecedents. Based on the concept of subjective well-being (SWB), the purpose of our study is to examine the crucial role of self-esteem, optimism and mastery toward employee well-being, with a particular focus on the IT sector of India. The current study examines the drivers of worker’s well-being. Uncovering the links among self-esteem, optimism, and workplace well-being can form the basis of the productivity of the workforce. We used cross-sectional survey data gathered from 274 workers from the IT sector in India and followed a linear regression approach to set up the link among antecedents of subjective well-being. To assess the association among variables, a regression analysis was done. We hypothesize that self-esteem, optimism, and mastery impact the SWB of employees. The findings revealed a positive effect of Self-Esteem, Optimism, and Mastery on SWB