This study aims to optimise employee performance at Pekalongan City Regional Secretariat through improving quality of work life and employee engagement, using organisational citizenship behaviour (OCB) as a mediator. Quality of work life and employee engagement are identified as key factors that have the potential to improve employee performance. By utilising mathematical equations, this study illustrates the relationship between these variables. The study population consisted of civil servants in the Regional Secretariat of Pekalongan City. Analysis methods include descriptive analysis, multiple regression, coefficient of determination test, F test (Anova), and mediation test (Sobel test).