The headquarters of retail technology business Pointy can be found in a red-bricked Victorian building on unfashionable Amiens Street in Dublin 1. Behind it is a railway track, and it is flanked by a petrol station on one side and bedsits on the other. It is a gritty enough location. But it is from here Pointy has broken all the traditional norms for Irish startups hoping to make it big. Against the accepted wisdom, Pointy has kept its core team in Dublin, far from its customers and partners in the US. Over 90 per cent of its 100-plus staff are…