Yoshiyuki Tabata
Chief OSS Consultant at Hitachi
Yokohama, Japan
Summary
👤
Senior🎓
Top SchoolYoshiyuki Tabata is Chief OSS Consultant at Hitachi with eight years of focused experience in Identity and Access Management and API platform design, backed by a Master’s in Creative Informatics from The University of Tokyo. He blends hands‑on engineering—having contributed notable fixes and OIDC/token handling improvements to Keycloak and implemented Redis-backed rate limiting for 3scale/APIcast—with strategic open source leadership as a CNCF Ambassador and TAG Security lead. He has driven IAM whitepapers, organized cloud‑native meetups across Japan, and regularly speaks at KubeCon and other global events on secure cloud‑native solutions. Comfortable operating at both code and governance levels, he is known for turning protocol‑level ambiguity into clearer, spec‑compliant implementations that improve interoperability and operational resilience.
8 years of coding experience
10 years of employment as a software developer
University of TokyoBachelor, Electronics for Informatics, Bachelor, Electronics for Informatics at Hokkaido University
Github Skills (17)
keycloak10
authorizations10
redis10
openid-connect10
oid10
openresty10
java10
lua10
javas10
api-gateway10
authorization10
api-design9
restful-api9
testing9
api-rest9
Programming languages (7)
Github contributions (5)
3scale/APIcast
Mar 2018 - Jun 2020
3scale API Gateway
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:66 commits, 19 PRs, 146 comments in 2 years 3 months
Contributions summary:Yoshiyuki implemented rate-limiting policies for the 3scale API Gateway, including the use of the lua-resty-limit-traffic module. Their contributions involved modifying Lua code to integrate rate limiting with Redis, adding configurations, and writing unit tests. The user also refactored the code to use the service scope and apply configuration changes.
api-gatewayapi3scalegatewaykubernetes
keycloak/keycloak
Nov 2019 - Feb 2022
Open Source Identity and Access Management For Modern Applications and Services
Role in this project:Back-end Developer
Back-end DeveloperContributions:31 reviews, 29 commits, 43 PRs in 2 years 3 months
Contributions summary:Yoshiyuki primarily focused on fixing and improving Keycloak's OpenID Connect (OIDC) and token handling mechanisms. They addressed several issues related to error responses, changing error codes and descriptions to improve clarity and adherence to OIDC specifications. Further contributions included refactoring of the token endpoint, particularly related to grant types and token revocation. They also implemented features related to client session management, including setting and modifying session lifespans.
oidcauthorizationidentity-and-access-managementaccess-managementsecurity
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