Doorn is a Louisville-based company that provides software development services to its clientele. It develops software for computers and mobile devices. For clients interested in mobile app development, the company works on standalone or integrated app development for iOS and Android. Its staff handles project management, backend development, managed releases to the Apple Play Store and Google Play, and continuing support or maintenance. Doorn has developed programs for clients such as the University of Louisville, with its software leading to data published in academic journals like the American Journal of Surgery.