The former co-head of interest rate products at Goldman Sachs in Europe is adding his name to the growing ranks of ex-bankers and investment professionals throwing their weight behind new financial technologies.

Patrick de Nonneville, a former partner at Goldman Sachs, has emerged as one of the investors in a $11 million funding round for Kantox, a London and Barcelona-based start-up that offers peer-to-peer currency transfers for small and medium-sized businesses.