PT. Kamajaya Arih Ersada is a construction service company that has yet to implement a digital platform capable of professionally representing its profile and services. This project aims to design a website User Interface (UI) as a digital promotional medium that is informative, attractive, and user-friendly. Design Method: This research uses the Research and Development (R&D) method with pre-production, production, and post-production stages which include needs analysis, visual concept design, prototype creation, and design evaluation based on User Interface and User Experience principles. The final outcome is a promotional website interface that highlights visual clarity, a structured information flow, and aesthetics relevant to the construction industry. The layout adopts modern design principles, such as grid systems, effective whitespace usage, visual hierarchy, and device responsiveness. This approach enhances user experience while reinforcing a professional impression of the company's brand identity. Thus, the website design is expected to function as a digital promotional medium that effectively supports PT. Kamajaya Arih Ersada's marketing strategy.
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