This study was conducted to investigate the influence of customer experience aspects of digital technology on the accessibility and usability of e-immigration service portals in Uganda. A cross-sectional survey design was employed, and data was collected from 293 clients who had utilized the National Citizenship and Immigration Control (NCIC) digital services. The collected data was analyzed using both SPSS and STATA software, with a focus on regression analysis to determine the nature and strength of the relationship. The results revealed a strong and statistically significant positive relationship. The model summary indicated a correlation coefficient (R) of 0.744 and an R-squared value of 0.554, demonstrating that 55.4% of the variation in the effectiveness of Immigration Services could be explained by variations in customer experience. The ANOVA test further confirmed the model's robustness, yielding an F-statistic of 361.497 which was significant at the 0.000 level. The coefficients analysis showed an unstandardized coefficient (B) of 0.875 for customer experience, indicating that for every one-unit improvement in customer experience, there was a corresponding increase of 0.875 units in service effectiveness. The study concluded that customer experience encompassing portal usability, information clarity, accessibility, and support responsiveness is a major and statistically significant determinant of the effectiveness of e-immigration services. The null hypothesis was rejected, confirming that customer experience aspects have a profound and predictable impact on service outcomes. It was recommended that the NCIC should prioritize continuous user-centric design improvements to the e-immigration portals, focusing specifically on enhancing interface intuitiveness, streamlining the application processes, and providing multi-channel, responsive support services. Furthermore, institutionalizing a continuous feedback mechanism to regularly capture and integrate user experience data is crucial for sustaining service improvements. These actions are essential for boosting client satisfaction, operational efficiency, and the overall success of Uganda's digital transformation in public service delivery.