Hiroshi Shibata
Fellow at 株式会社アンドパッド
Tokyo, Japan
Summary
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Rockstar🎓
Top School
Top expert inRuby Development and Security Analysis
Hiroshi Shibata is a seasoned software engineer and technology leader with 19 years of experience, currently serving as Fellow at Andpad in Tokyo. A full-time open-source maintainer and member of the Ruby core and RubyGems teams, he has a long track record of stabilizing and modernizing critical Ruby infrastructure—contributions span rubygems, rdoc, json, psych, openssl and bundler. He has held executive engineering roles at GMO Pepabo where he combined hands-on backend development with engineering leadership and platform stewardship. Hiroshi’s work is notable for careful backports, test automation and cross-version compatibility fixes that keep widely used libraries healthy across Ruby releases. He also contributes to web server extensions (ngx_mruby) and community-facing projects like rubygems.org and Rails Girls guides, blending deep technical craft with documentation and deployment improvements. Trained in management and information systems engineering, he pairs academic rigor with pragmatic maintenance of large, mission-critical ecosystems.
19 years of coding experience
14 years of employment as a software developer
情報工学科, 情報工学科 at 苫小牧工業高等専門学校Master, Management and Information Systems Engineering, Master, Management and Information Systems Engineering at 長岡技術科学大学 / Nagaoka University of Technology
Japanese, English
Github Skills (62)
dependency-management10
json-parser10
json10
git10
ruby-rails10
content-management-system10
bump10
package-management10
rubygems10
testing10
user-manual10
open-source10
rails10
build-system10
c1110
Programming languages (23)
Github contributions (5)
ruby/rake
Dec 2014 - Jan 2023
A make-like build utility for Ruby.
Role in this project:
Backend Developer
Backend DeveloperContributions:78 releases, 5 reviews, 586 commits in 8 years 3 months
Contributions summary:Hiroshi primarily contributed to the Ruby `rake` project by backporting changes from the Ruby trunk and bumping the version. They made modifications to various files including those related to testing, file utilities, and task management, along with removing legacy code related to older Ruby versions. The user also removed deprecated features like alt_system, and deprecated documentation and updated the project by using Rake::VERSION and Kernel.system.
rakerakefileruby
ruby/psych
Jan 2014 - Jan 2023
A libyaml wrapper for Ruby
Role in this project:Back-end Developer
Back-end DeveloperContributions:69 releases, 7 reviews, 363 commits in 9 years 1 month
Contributions summary:Hiroshi primarily contributed to the `psych` library, which is a YAML parser and emitter for Ruby. Their work included fixing typos in the code, removing unused variables, and backporting features from Ruby's trunk. The commits show that the user was involved in improvements to both the core parsing logic and related configuration files. Additionally, the user addressed merging branches for integration.
ruby-gemlibyamlpsychrubyyaml-parser
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