Yoshinori Hayashi
Security Engineer at LINEヤフー株式会社
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolYoshinori Hayashi is a Security Engineer based in Tokyo with nine years' experience protecting web, mobile, desktop, IoT, and fintech products across major Japanese tech companies. He has played hands-on roles in application and security assessment teams at LINE, LY Corporation, Cybozu, and Mitsui Bussan Secure Directions, focusing on vulnerability testing, risk assessment, and bug bounty operations. Known for bridging deep technical testing with pragmatic quality assurance, he helps teams ship secure services at scale across diverse platforms. Yoshinori’s background includes operating within large product ecosystems and coordinating cross-group security efforts, which sharpens his ability to spot systemic risks beyond individual vulnerabilities. He maintains a public presence for deeper detail at about.8ay.ac, signaling an emphasis on transparency and continuous learning.
8 years of coding experience
4 years of employment as a software developer
情報科学専門学校
Github Skills (8)
entity10
entity-framework9
ent9
orm8
golang7
finder6
active6
lists4
Programming languages (5)
Github contributions (5)
8ayac/blog.8ay.ac
Mar 2021 - Mar 2023
My blog hosted on https://blog.8ay.ac/.
Contributions:1 PR, 30 pushes in 2 years 1 month
hostedmy-blogjekyll
8ayac/dotfiles
Sep 2017 - Oct 2020
Contributions:103 pushes, 1 branch in 3 years 1 month
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