Sergi Siso is a High-Performance Software Engineer at the Hartree Centre (STFC, UKRI), based in the Daresbury Laboratory, UK. He holds a PhD in Computer Science from the University of Liverpool, a Master’s in Information Technology from the Polytechnic University of Catalonia and a Master in Science with distinction in High Performance Computing from the University of Edinburgh. His research interests include the performance analysis, parallelisation, and optimisation of scientific applications for heterogeneous HPC systems, particularly using compiler technologies. He is currently one of the main developers of PSyclone, a source-to-source optimising compiler for weather and climate models used by the UK MetOffice.