Soutaro Matsumoto
Senior Web Developer at bitmine24
Ichikawa, Japan
Summary
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RockstarSoutaro Matsumoto is a Senior Web Developer based in Ichikawa, Japan, with 16 years of hands-on experience building and hardening backend systems and test automation. He combines deep language-level work—contributing parsing and bug fixes to projects like Ruby and PHP analysis tools—with practical QA and automation expertise, improving test suites for widely used JS tooling such as fake-timers. At his current role with bitmine24 he focuses on delivering robust web services while drawing on cross-platform experience that includes iOS test automation enhancements. His contributions show a knack for improving core developer tooling and edge-case handling, from variadic parameter parsing to Date and timer semantics in tests. Known for meticulous tests and infrastructure fixes, he brings reliability-minded engineering that reduces regressions and improves maintainability.
16 years of coding experience
Github Skills (18)
objective-c10
javascript10
ios10
testing10
ruby10
php10
parsing10
parse10
test-automation10
json9
build-automation9
code-analysis9
rdoc8
programming-language8
c117
Programming languages (14)
Github contributions (5)
ruby/ruby
Jun 2015 - Mar 2025
The Ruby Programming Language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:11 reviews, 121 PRs, 59 pushes in 9 years 10 months
Contributions summary:Soutaro made several contributions to the Ruby programming language repository. They fixed bugs related to String manipulation, specifically the `slice!` method. They also worked on the build and testing infrastructure, including setting up and configuring tests for bundled gems, and adjusting testing to skip validation in certain conditions. Furthermore, they corrected constant document directives, and addressed issues within the RDoc, contributing to documentation and parsing.
object-orientedruby-languageprogramming-languagerubyc
moredip/Frank
May 2012 - Jun 2013
Automated acceptance tests for native iOS apps
Role in this project:Mobile Developer (iOS) & Test Automation Engineer
Mobile Developer (iOS) & Test Automation EngineerContributions:23 commits in 1 year 1 month
Contributions summary:Soutaro primarily contributed to the Frank framework, a tool for automated acceptance tests for native iOS apps. Their work included implementing app command functionality, which involved modifying the app delegate and generating responses. Furthermore, they added functionality to the framework, specifically for keyboard interaction within the iOS environment. These contributions demonstrate a focus on enhancing the testing capabilities of the Frank framework and integrating it with various iOS functionalities, as shown by new features like keyboard input and the generation of appropriate test responses.
acceptance-teststestingsoftware-qualityios-nativeautomation
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