Seiya Izumi
Frontend Platform
Chiba Prefecture, Japan
Summary
👤
Senior🎓
Top SchoolSeiya Izumi is a frontend platform engineer with 12 years of experience building high-traffic, scalable web applications and developer platforms from the UI to the infrastructure. Starting C at age 10, he brings a long-cultivated curiosity to full-stack work across Ruby, TypeScript/React, Go, Scala and Elm, and operational tooling like Docker, CI/CD, and Google Cloud. He has led platform and product engineering efforts—designing SDKs, design systems, and AppShells—and improved team delivery through organizational design, test automation, and performance-first architecture. At Unipos he accelerated frontend release cadence 10x via CI/CD and ChatOps, and contributed to notable open-source projects such as undux by improving immutable state handling for React. Comfortable shaping both technical systems and engineering teams, he prefers remote work and is based in Chiba, Japan.
12 years of coding experience
5 years of employment as a software developer
学士（文学）, 人文学部英語英米文化学科 コミュニケーションコース, 学士（文学）, 人文学部英語英米文化学科 コミュニケーションコース at 武蔵大学
Japanese, Chinese
Stackoverflow
1,528reputation
166kreached
49answers
6questions
Github Skills (17)
immutablejs10
testing10
react10
redux9
typescript9
typescript-types9
flux9
fluxor9
typescripts9
html6
vuejs26
ecmascript6
nodejs6
vue6
haml6
Programming languages (15)
Github contributions (5)
bcherny/undux
Feb 2018 - Feb 2018
⚡️ Dead simple state for React. Now with Hooks support.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:20 commits, 2 PRs, 11 comments in 3 days
Contributions summary:Seiya primarily contributed to the `undux` repository by modifying and testing immutable data handling within a React context. Their work involved refactoring code to use an external `immutable-is` library, implementing a test component for immutable state, and resolving type definition issues. These changes were focused on ensuring proper interaction with immutable data structures within the React application. The user also removed and reverted some test and import statements.
reactreduxtypescripttypesafeflux
IzumiSy/react-nanorouter
May 2020 - Jul 2023
Terribly simple router for React
Contributions:14 PRs, 37 pushes, 16 branches in 3 years 2 months
reactrouter
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