David Shackleton is a co-founder of OpenBack, the only mobile engagement platform with dynamic push notifications and device-side decisions. In 2006, David also co-founded Ding, the largest international top-up platform which delivers a top-up every second across more than 130 countries. David served as Ding's CEO when the business employed over 220 people around the world, bringing in annual revenues in excess of $500m from Ding.com, mobile apps, and 600,000+ retail stores globally. Prior to Ding, David was a management consultant with the Monitor Group in the US, working in Boston and New York. David is an alumnus of Trinity College Dublin, where he holds a degree in Computer & Electronic Engineering.