David Ranftler sipgate GmbH , Köln Branche: Telekommunikation Anschrift – 00000 Köln Deutschland Kontakt E-Mail hello@davidran.me Web https://www.davidran.me/ Soziale Netzwerke https://www.linkedin.com/in/davidran/ https://twitter.com/DavidRanftler Infos Skills User Research Usability Testing User Interviews Journey Mapping UX Strategy Design Review Prototype Testing Persona Building Card Sorting UX Analytics Surveys Product Discovery
