Purpose – This study aims to examine and explain the role of employee engagement as a mediating variable in the relationship between work-life balance and flexible working arrangement with employee job performance. The research seeks to understand how workplace flexibility and employee well-being contribute to improving performance outcomes. Design/Methodology/Approach – This study employs a quantitative research approach. The population consisted of employees of Motul Indonesia, with 58 employees involved as respondents using a census sampling technique. Data were collected through questionnaires and analyzed using Partial Least Squares–Structural Equation Modeling (PLS-SEM) with SmartPLS version 4.0.9.9. Findings – The findings reveal that work-life balance has a positive and significant effect on job performance, while flexible working arrangement has a positive but insignificant effect on job performance. Furthermore, work-life balance and flexible working arrangement both have positive and significant effects on employee engagement. Employee engagement also has a positive and significant effect on job performance. The mediation analysis shows that employee engagement partially mediates the relationship between work-life balance and job performance, while it fully mediates the relationship between flexible working arrangement and job performance. Originality/Value – This study contributes to human resource management literature by highlighting the mediating role of employee engagement in linking work-life balance and flexible working arrangements with job performance. The findings provide practical implications for organizations in designing employee-centered workplace policies that enhance engagement and performance.