kaufDA the innovative, multiple award-winning online user portal, informs the user comfortably and up-to-the-minute about the local shopping facilities: The consumers receive product offers and promotional information from various retailers from their city with one click.With our portal we prove, that Grails is ready for production usage of a high traffic platform. kaufDA is the Grails application with the highest traffic in Germany and it generates multiple GBs of new data per day. Currently kaufDA operates with 500req/s, 5 million unique visitors/month, serving web and mobile users as well as integration partners. Furthermore we are using Grails for all our in-house tools. We successfully combine Grails with the following technologies: PostgreSQL, MongoDB, Puppet, Apache httpd, Tomcat, Squid-Cache, Icinga, Graylog2, KVM+Ganeti, Debian, RHEL, Akamai CDN, Amazon Web Services, activeMQ, Terracotta and many more...Since March 2011 kaufDA is part of Axel Springer AG, one of the biggest media companies in Europe and Germany's biggest newspaper publisher. For the past year, kaufDA has internationalized its scope and is now present in France, Russia, Spain and Brazil.