Yuji Yaginuma
Software Engineer at 株式会社アンドパッド
Saitama Prefecture, Japan
Summary
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Top expert inRuby on Rails Development Ecosystem
Yuji Yaginuma is a Technical Lead and seasoned backend engineer with 13 years of professional experience, specializing in Ruby on Rails and web services since 2008. He has launched multiple services at venture companies and freelanced on medical and EC platforms, covering feature development, architecture design, performance tuning, and library migrations. A pragmatic engineer who also maintains and authors libraries, he contributes fixes and tests to high-profile open-source projects including Rails, Ruby core, and Protocol Buffers, improving compatibility, security, and build/test infrastructure. Comfortable with AWS-based infrastructure and front-end stacks like Vue.js/React, he recently served as the sole backend engineer for a new product while mentoring cross-functional teams. Notably, he proactively patches third-party libraries and creates tooling (including a Windows CLI in Go), reflecting a bias for durable, production-ready solutions. Based in Saitama, Japan, he combines deep Rails expertise with practical devops and QA experience to ship reliable systems.
13 years of coding experience
19 years of employment as a software developer
Computer Science, Computer Science at 日本大学
Github Skills (32)
ruby-rails10
programming-language10
back-end-development10
rubygems10
protocol-buffers10
testing10
rspec10
rails10
decorator10
ruby10
decorators10
lang10
build-automation10
code-cleanup10
minitest10
Programming languages (23)
Github contributions (5)
drapergem/draper
Jan 2020 - Dec 2021
Decorators/View-Models for Rails Applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:37 reviews, 2 commits, 31 PRs in 1 year 11 months
Contributions summary:Yuji contributed to the Draper gem, a library for decorators/view-models in Rails applications. They implemented support for Rails 6.0, addressing API changes in `ActionView::Base` and updating the dummy application. The user improved performance by optimizing method calls through `delegate_all` and added compatibility for `Turbo::Broadcastable` and `GlobalID`. They also updated the test suite and made minor changes to the project's configuration.
decoratorsrailsviewmodelruby
rails/globalid
Jul 2016 - Mar 2019
Identify app models with a URI
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:13 commits, 11 PRs, 3 pushes in 2 years 8 months
Contributions summary:Yuji primarily contributed to improving the robustness and security of the `globalid` library. They addressed a potential vulnerability by ensuring the purpose of a `SignedGlobalID` is verified when passed to `locate_signed`. Furthermore, the user implemented eager loading of constants to mitigate potential issues with multi-threaded environments like Sidekiq. They also updated the codebase to use `secret_key_base` and added tests to ensure proper behavior in different Rails environments.
ruby-on-railsurirailsactivemodelidentify
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