Tokugawa Takesi
Chief Executive Officer at Yamato Daiwa Co., Ltd.
Tokyo, Japan
Summary
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RockstarTokugawa Takesi is a Tokyo-based CEO and founder with 7 years of hands-on software engineering experience, leading Yamato Daiwa as a one-person startup focused on TypeScript, C#, Vue/Nuxt, and .NET MAUI & Blazor. He combines executive leadership with active engineering, contributing to high-profile open-source projects like DefinitelyTyped by authoring and maintaining TypeScript .d.ts definitions that improve developer ergonomics across the JavaScript ecosystem. Comfortable spanning front-end and cross-platform UI stacks, he brings practical product focus and shipping discipline from prototype to production. Since his Japanese naturalization he works under the official name Takeshi Tokugawa, reflecting a personal commitment to long-term roots in Japan while engaging globally through open source.
8 years of coding experience
Github Skills (8)
typescript10
javascript10
typescript-definitions10
typescripts10
type-definition10
typescript-types10
dts9
gulp9
Programming languages (12)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Mar 2019 - Sep 2020
The repository for high quality TypeScript type definitions.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:6 reviews, 23 commits, 22 PRs in 1 year 6 months
Contributions summary:Tokugawa primarily contributes to the repository by adding and updating TypeScript type definitions for various JavaScript libraries and tools. Their work involves creating and modifying `.d.ts` files, which define the types for different packages like `gulp-tap`, `gulp-intercept`, `gulp-postcss`, and others. These contributions enhance the developer experience by providing type safety and autocompletion within TypeScript projects.
typescriptdefinitiondtstypingstypescript-definitions
TokugawaTakeshi/yamato-daiwa.com
Oct 2022 - May 2026
Contributions:36 pushes, 1 branch in 3 years 8 months
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