ZipRealty is one of the largest real estate brokers in the US, and when ZipRealty needed help creating its first mobile app, it hired Tim to help build it. His responsibilities included virtually every aspect of the ZipRealty iPhone app, from mapping to photo display. When that was done, Tim created ZipRealty's novel "HomeScan" augmented reality feature. Then when the iPad was announced, Tim began adapting the app so that it was one of only two real estate apps available for the iPad launch. To further drive innovation, Tim recruited designer John Ellenich to thoroughly adapt the interface for the iPad and later worked with designer Billie Mandel on the feature-rich 3.0 release.