Splitsecnd is a revolutionary portable safety device for any car with real-time GPS monitoring and automatic crash detection that reduces emergency response time by up to 60%, saving both time and lives. I worked together with the product owners and developers to craft the visual design and interaction design of the web app's user portal, the self-service management portal, and the mobile application. I defined the user persona, sitemap, wireframes, and prototypes until having a solid version to be used by the beta testers.