<![CDATA[This study aims to evaluate and optimize the User Interface (UI) and User Experience (UX) on the Online Single Submission (OSS) website as a digital public service platform in Indonesia. The main problems with OSS include complex navigation, low clarity of information, and lack of support for new users. The research method uses a design thinking approach with five stages: emphatize, define, ideate, prototype, and test. The evaluation was carried out through usability testing using System Usability Scale (SUS), Net Promoter Score (NPS), and User Experience Questionnaire Plus (UEQ+) instruments, as well as performance indicators such as task completion rate, error rate, and time-based efficiency. The results of the study showed that the UI/UX quality of the existing OSS website was low (SUS 49.33 – category F, NPS -23%, UEQ+ 0.77). In contrast, the OSS prototype developed showed a significant improvement (SUS 79.5 – category B, NPS 30%, UEQ+ 2.43). Improvements in the form of simple navigation, non-intrusive information banners, step-by-step guides, chatbots, and interactive indicators have been proven to improve efficiency, interaction success, and user satisfaction.]]>
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