The food-delivery industry has gained increasing attention for its high level of freedom and flexibility and highly rewarding employment. This study aims to explore the relationship between employee engagement and psychological contract, perceived organizational support, and job performance in the context of gig economy, which has some reference value to theory and practice. In this study, quantitative analysis was conducted with the help of the Credamo Big Data platform, and descriptive statistics and multiple linear regression analysis were conducted on 105 sample data by SPSS27.0 and Stata 17.0. The study found a significant positive correlation between employee engagement and psychological contract, perceived organizational support, and job performance. Therefore, platform enterprises should pay attention to the psychological demands of delivery person, strengthen the perceived organizational support of platform enterprises to external selling riders, and optimize the performance appraisal system of takeout riders, so as to improve the employee engagement of takeout riders.