Carrefour invites hackfest enthusiasts to its first hackathon "Back2Hack" from 23 to 25 September   Boulogne-Billancourt, FRANCE, 2016-Sep-22 — /EPR Retail News/ — From 23 to 25 September, Carrefour is inviting hackfest enthusiasts to come and improve the customer experience and make predictions about future trends. Carrefour is holding "Back2Hack" – its first hackathon – at the IO Factory.…