Hans L
Staff Software Engineer II at Visa
San Francisco Bay Area United States
Summary
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Rockstar🎓
Top SchoolHans L is a Staff Software Engineer II with 11 years of experience and over eight years at Visa, where he leads large Risk and Identity initiatives and pioneers Generative AI projects. He specializes in building high-throughput, low-latency fraud prevention systems using Go, OPA, cloud-native architectures, and Visa’s rich data assets. His delivery portfolio includes Apple Pay integrations, Secure Data Services, and Visa Risk Manager APIs, reflecting deep domain expertise in payments and identity. Earlier roles span high-frequency trading models, realtime payments, and merchant gateway systems, showing a consistent focus on latency-sensitive, mission-critical platforms. Based in the San Francisco Bay Area, he blends hands-on engineering and technical leadership to translate “IPAs to APIs”—turning research and prototypes into production-grade services. Colleagues rely on him for pragmatic architecture choices that balance performance, scalability, and operational safety.
11 years of coding experience
18 years of employment as a software developer
Bachelor of Science (B.Sc.) Information Management Department, Bachelor of Science (B.Sc.) Information Management Department at Peking UniversityUMBC
computer language (java python go etc), English, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (200)
xmlhttprequest10
javascript-client10
ui-components10
sms10
message-queue10
http-client10
javascript10
client-library10
bull10
browser10
bullmq10
mobile-phones10
sdk10
phone-number10
job-queue10
Programming languages (8)
Github contributions (5)
cmusv-fse/web-techs
Feb 2021 - Feb 2021
Contributions:10 commits, 8 pushes in 6 days
sasd-fall-2021-t3/weread
Oct 2021 - Dec 2021
Contributions:80 reviews, 54 PRs, 117 pushes in 1 month
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