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John Mitsuishi is an experienced data scientist currently working at Topaz since September 2021, focusing on online fraud detection solutions. Prior to this role, John was a data scientist at Gerdau from February 2008 to September 2021, contributing to the Smart Decision squad for optimizing steel rolling mill production programming and improving customer service levels using various technologies including Python and AWS. John's previous positions at Gerdau included specialist roles in ferrous scrap market intelligence and recycling, alongside management positions overseeing scrap operations and grading process studies. John's early career included internships at AgênciaClick, Santander Brasil, Promon Engenharia, and Banco do Brasil. John holds a Bachelor's Degree in Civil Engineering from USP and has pursued additional education at FGV, FIA, and PUC Minas.