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Joseph O'Sullivan is a Senior Software Engineer with extensive experience in backend development, currently employed at Affirm since April 2022. Prior to this role, Joseph worked at Capital One from July 2016 to April 2022, contributing as a Senior Software Engineer within the Engage organization and on the CreditWise application. Responsibilities included designing and developing Java Spring Boot microservices, re-architecting monolithic applications, and modernizing systems to meet enterprise and cyber standards. Joseph also oversaw AWS infrastructure and led the implementation of a real-time credit alerts platform. Earlier experience includes a mobile development internship at DataDog Health, where Joseph developed an iOS app focused on stress management, and a summer internship at Washington University in St. Louis. Joseph holds a Bachelor of Science in Computer Science from Washington University in St. Louis, earned in 2016.