 While at InternetQ, Leon contributed in the launch of fleamarket.gr, the first Greek online auction portal in 1999, which exceeded $1 billion in cost of goods sold during the first 2 years of operation.Fleamarket.gr was later sold to Qmobile co-founder and business partner Alexi Faraco and renamed to emarket.gr.In 2003 Leon co-founds Qmobile, with Alexi Faraco, a Reston, Virginia based mobile startup, that quickly gained 1 million subscribers.