This dissertation investigates the relationship between employee job satisfaction and its impact on job performance, focusing on a case study of Sompo Insurance (Hong Kong) Co., Ltd. The research encompasses five chapters, beginning with an introduction that outlines the research rationale, aims, objectives, and research questions. The literature review provides a theoretical framework, exploring concepts such as Affect Theory, Discrepancy Theory, and Herzberg’s Two-Factor Theory. The methodology chapter details the research approach, including the use of positivism philosophy, an explanatory research design, and a deductive approach, utilizing both primary and secondary data collected through an email survey of 50 senior-level employees. Data analysis involved SPSS 2.0 software for correlation and regression analysis. The findings indicate a low level of job satisfaction among Sompo Insurance employees due to stress and performance management issues, including conflict management and limited growth opportunities. The study concludes with recommendations to improve work-life balance, performance management, quality of supervision, and employee engagement, along with limitations and suggestions for future research.