This study explores the factors influencing knowledge sharing and its impact on job engagement among public servants in Ho Chi Minh City amid economic and societal changes. Utilising the knowledge-based view theory, a comprehensive model was developed and assessed using PLS-SEM statistical techniques on data from 300 public servants. The analysis revealed that job engagement is influenced by factors like self-enjoyment, self-efficacy, social interaction, and reciprocity, while knowledge sharing is affected by factors including self-enjoyment, reputation enhancement, self-efficacy, reciprocity, and trust. Furthermore, knowledge sharing positively impacts job engagement and mediates factors such as self-enjoyment, reputation enhancement, self-efficacy, reciprocity, trust, and job engagement. This research highlights the crucial role of knowledge sharing in promoting job engagement within Vietnam's public sector, providing valuable insights into their dynamic interplay. Despite the absence of longitudinal data, this research provides valuable insights for fostering job engagement and promoting knowledge sharing among public employees.