Takashi Norimatsu
Chief OSS Specialist at Hitachi
Yokohama, Japan
Summary
🤩
Rockstar🎓
Top SchoolTakashi Norimatsu is a security-focused software engineer with nine years of experience who currently serves as Chief OSS Specialist at Hitachi, driving design and implementation of authentication and authorization features for enterprise systems. An active maintainer and Tech Lead in the Keycloak community, he has contributed protocol-level server work—adding PKCE and DPoP support—and UI integrations to one of the leading open-source IAM projects. He combines deep academic training (PhD-level work in computer science and applied statistics) with long-standing industry experience at Hitachi, enabling rigorous, data-informed security design. Based in Yokohama, he specializes in API security and OAuth/OIDC protocols, bridging open-source stewardship with practical enterprise deployments.
9 years of coding experience
Sanjyo High School (Niigata prefecture, Japan)PhD in Engineering, Computer Science, PhD in Engineering, Computer Science at Okayama UniversityM.Eng., Stochastic Process, Applied Statistics at Doctoral Program in Policy and Planning Sciences, M.Eng., Stochastic Process, Applied Statistics at Doctoral Program in Policy and Planning Sciences at University of Tsukuba
Github Skills (13)
security10
javas10
openidc10
oid10
authentication10
authorizations10
user-authentication10
backend10
back-end-development10
oauth10
authorization10
java10
openid-connect10
Programming languages (5)
Github contributions (5)
keycloak/keycloak
Feb 2017 - Sep 2022
Open Source Identity and Access Management For Modern Applications and Services
Role in this project:
Backend Developer
Backend DeveloperContributions:864 reviews, 121 commits, 206 PRs in 5 years 8 months
Contributions summary:Takashi's commits primarily focused on implementing and modifying features related to OAuth 2.0 and OpenID Connect (OIDC) within the Keycloak project. Their work involved server-side implementation, including token endpoint modifications to support Proof Key for Code Exchange (PKCE) and the integration of a DPoP mechanism. The user also contributed to user interface elements, demonstrating a strong understanding of backend and protocol-level aspects of authentication and authorization. This included working on the authentication channel and token validation.
access-managementkeycloakoidcsaml
webauthn4j/keycloak-webauthn-authenticator
Apr 2019 - Nov 2019
Contributions:33 commits, 18 PRs, 30 pushes in 7 months
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