Masato Mitsui
Senior Software Engineer at フリーランス
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolMasato Mitsui is a Senior Software Engineer with two decades of hands-on experience building web systems and leading technical teams, now focused on cloud-based web architectures. He brings deep Java and JavaScript expertise, extensive familiarity with Spring, legacy JSF frameworks, and broad database experience from Oracle to PostgreSQL. As a former tech lead and PMO, he has delivered complex government, media, and ISP projects across Linux and Windows stacks, integrating application servers, middleware, and CI/CD tools. He also contributes to open-source quality by improving test coverage for popular projects like tween.js, demonstrating attention to edge cases and reliability in front-end animation code. Comfortable switching between code, operations, and project leadership, he combines practical implementation skills with a disciplined approach to testing and delivery. Based in Chiyoda, Japan, he pairs a pragmatic engineering style with continuous learning in cloud-native systems.
10 years of coding experience
17 years of employment as a software developer
Information Technology, Information Technology at Kinki Polytechnic College Kyoto
Github Skills (8)
unit-testing10
test-framework10
javascript10
animation10
testing10
typescripts8
typescript8
typescript-types8
Programming languages (4)
Github contributions (5)
tweenjs/tween.js
Apr 2021 - May 2021
JavaScript/TypeScript animation engine
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:6 reviews, 12 commits, 10 PRs in 18 days
Contributions summary:Masato primarily contributed to improving the test coverage and quality of the `tween.js` library. They added new unit tests to verify the behavior of the `_repeat` property, browser sleep functionality, and the `onRepeat` callback. Additionally, the user implemented tests for the `generatePow` function and interpolation methods, ensuring the library's accuracy and reliability. These changes demonstrate a focus on ensuring the correct functionality and edge cases of the animation engine.
interactionanimationjavascriptanimation-enginemotion
MasatoMakino/sandbox-deploy-action-chain
Oct 2021 - Dec 2023
A sketch of deployment automation with GitHub Actions
Contributions:9 PRs, 35 pushes, 10 branches in 2 years 2 months
pythondeploymentnetboxautomationsketch
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