Jonathan Madelaine
Senior Frontend Engineer at Cybozu, Inc.
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolJonathan Madelaine is a Senior Frontend Engineer with nine years of professional experience and five years focused on architecting modern React and TypeScript applications. He led the front-end rebuild of Wipster’s multi-platform product—spanning a React web app, an Adobe panel extension, and an iOS app—and has built PWAs, dev tooling, embedded plugins, and open-source libraries like ts-guardian. A self-taught C# origin story and early .NET API work give him strong full-stack instincts, while his emphasis on type-safety, i18n, and browser quirks (especially Safari) drives pragmatic, maintainable UI engineering. Currently based in Tokyo and fully flexible to relocate with visa sponsorship, he’s on a self-funded sabbatical traveling Asia and studying for JLPT N3, yet eager to rejoin a collaborative team. Colleagues would call him a “flex-box aficionado” who pairs deep technical craft with an appetite for hands-on product work.
9 years of coding experience
6 years of employment as a software developer
BSc Sport & Exercise Science, BSc Sport & Exercise Science at University of Leeds
Github Skills (135)
datetime10
scroll10
testing10
drag10
visual-studio10
javascript10
pinch10
editor10
dates10
gestures10
html10
angular10
electron10
typescript10
vscode-extension10
Programming languages (4)
Github contributions (5)
jmadelaine/ts-guardian
Nov 2020 - Oct 2024
Functional type guarding
Contributions:4 PRs, 36 pushes, 2 branches in 3 years 11 months
typescriptfunctional-programming
jmadelaine/baselift
Sep 2019 - Sep 2020
React base components that implement Emotion
Contributions:49 commits, 24 pushes, 1 branch in 1 year
base-componentsreactemotionreact-componentsreactjs
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