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Although cryptographic security is often the main concern in e-voting system development, practical implementation failures are frequently associated with poor user interfaces that increase cognitive load and voting errors. This study evaluates the effectiveness of User-Centered Design (UCD) interventions in improving usability and voter confidence in an e-voting system. A one-group pretest-posttest design was applied to 36 respondents representing novice voters. Usability was measured using the System Usability Scale (SUS) before and after the interface redesign. The intervention focused on visual hierarchy, navigation consistency, status visibility, and error prevention. The results show a statistically significant improvement, with the mean SUS score increasing from 69.10 in the marginal category to 95.76 in the excellent category. The paired sample t-test produced t(35) = -7.3441 with p < 0.0001, while Cohen's d reached 1.2130, indicating a large practical effect. The standard deviation also decreased from 21.98 to 3.09, demonstrating a more consistent user experience. These findings indicate that interface optimization is essential for strengthening accessibility, voting accuracy, and user trust in digital democracy systems.

The election of regional heads is a form of democratic implementation that requires the active participation of the community as voters. However, in its implementation, various obstacles are still found such as low voter participation, limited access to information, and lack of efficiency in the conventional voting process. This research aims to develop an online-based regional head election information system as a solution to increase voter participation through the use of digital technology. The research method used is Research and Development (R&D) with a Waterfall system development model which includes the stages of needs analysis, system design, implementation, testing, and evaluation. The developed system provides features of voter registration, candidate information, online voting process, and real-time recapitulation of vote results. The system test is carried out using the Black Box Testing method and shows that all system functions are running according to the user's needs. The results of this study show that the implementation of an online-based election information system can provide easy access, increase transparency, and encourage community involvement, especially young voters, in the process of electing regional heads. Thus, this system has the potential to become a digital innovation that supports improving the quality of local democracy.