Xavier has been working with SDMx (Statistical Data and Metadata Exchange) since 2005. He has represented two sponsors, the BIS and the ECB, in the SDMx Technical Working Group and has led the development of the SDMx-REST API since its inception. He is also the author of two SDMx open source libraries, pysdmx and sdmx-rest4js. Currently, Xavier designs and implements metadata-driven systems using Python, powered by SDMx and Fusion Metadata Registry (FMR).