Sean O
Senior Software Engineer at Marqeta
Los Angeles Metropolitan Area United States
Summary
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Senior🎓
Top SchoolSean O is a Senior Software Engineer with 7 years of experience building scalable, highly available systems, currently focused at Marqeta on fintech solutions around identity verification, account monitoring, and compliance. He has a strong backend pedigree, having owned Trust & Safety implementations, integrated ML-based content classification, and reduced fraud through matching and attribution systems. Comfortable across stacks—Java/Spring, Node/Koa, and React—he pairs engineering rigor with product-minded execution to deliver backward-compatible features and cleaner legacy replacements. Sean thrives on learning from teammates and new technologies, often translating that curiosity into practical automations and tools that reduce manual work. His background ranges from enterprise IT and instructional roles to academic engineering at UC Berkeley, giving him a pragmatic approach to documentation, onboarding, and cross-functional collaboration. Colleagues rely on him to tackle complex distributed problems while keeping quality and long-term maintainability front and center.
7 years of coding experience
6 years of employment as a software developer
Electrical Engineering and Computer Science Computer Science, Electrical Engineering and Computer Science Computer Science at University of California, BerkeleyHigh School Diploma General Education, High School Diploma General Education at Pleasant Valley High SchoolAssociate of Science (A.S.) Mathematics and Computer Science, Associate of Science (A.S.) Mathematics and Computer Science at Butte College
English, SpanishGithub contributions (2)
sean132/FSAE-Lapsim
Dec 2018 - Mar 2019
Contributions:68 commits, 50 pushes, 2 branches in 2 months
valmik/air_traffic_control
Nov 2018 - Dec 2018
Contributions:21 pushes in 14 days
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