William Cossey is a highly experienced software engineer with a career spanning over 18 years, currently serving as a Senior Software Engineer at Marex since May 2025. Prior to this role, William held positions as a Senior Software Engineer at StoneX Group Inc. and as a Senior Software Developer at Moneysupermarket Group. William's extensive background also includes serving as a Managing Senior Software Engineer at Totaljobs Group and leading a software team at Derivco Sports. Additionally, William has worked as a Senior Software Developer at Derivco London and Win Technologies, and began a career in software development as a Senior Delphi Developer at Squirrel Maths.
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