Hiroki Osame

Tokyo, Japan

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Summary

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Rockstar

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Top School

Hiroki Osame is a Tokyo-based software engineer with 12 years of experience specializing in JavaScript and TypeScript, currently building frontend DX at Vercel after several years improving developer experience and web platform tooling at Square. He has a strong track record of scaling developer workflows—introducing TypeScript to a 60+ engineer codebase, leading a Vue 3/Vite migration, and cutting dev refresh times from ~60s to near-instant. An active open-source contributor, Hiroki has implemented ESLint rules for the Vue.js ecosystem and contributed to widely used tooling like esbuild-loader and TypeScript runtimes. He focuses on code quality, tooling reliability, and performance, with hands-on work across full-stack bundlers, minification benchmarks, and task runners. Notably, he authors practical fixes such as vite-css-modules to resolve upstream issues and builds CLI tooling that integrates AI for developer workflows. He combines product-minded UX collaboration with deep engineering rigor to make large teams more productive.

12 years of coding experience

11 years of employment as a software developer

High School, High School at Canadian Academy

Bachelor of Arts (BA), Computer Science, Bachelor of Arts (BA), Computer Science at Boston University

English, Japanese

Stackoverflow

Stats

315reputation

24kreached

1answer

10questions

Github Skills (48)

git10

openai-api10

javascript10

benchmark10

typesc10

swc10

jes10

testing10

css10

typescript10

typescript-definitions10

tasks10

eslint10

sourcemaps10

webpack10

Programming languages (16)

CSSRustCTwigVueGoHTMLTypeScript

Github contributions (5)

privatenumber/pkgroll

Mar 2022 - Jan 2023

📦 Zero-config package bundler for Node.js + TypeScript

Role in this project:

Full-stack Developer

Contributions:50 releases, 13 reviews, 81 commits in 10 months

Contributions summary:Hiroki primarily focused on improving the functionality and robustness of the package bundler. Their contributions include fixing bugs related to handling different file types, ensuring cross-platform compatibility, and implementing features like environment variable support. The user also added minification capabilities and improved the build process by correctly handling imports and exports. Their work also involved refactoring tests and improving overall code quality.

exportscjsdeclarationresolvezero

privatenumber/tsx

May 2022 - Jan 2023

⚡️ TypeScript Execute | The easiest way to run TypeScript in Node.js

Role in this project:

Back-end Developer

Contributions:100 releases, 62 reviews, 157 commits in 8 months

Contributions summary:Hiroki's contributions focused on enhancing the functionality and stability of the TypeScript runtime environment. Their commits primarily addressed bug fixes and improvements related to the watch command, including fixing path dependencies, hiding experimental warnings, and setting timeouts for tests. They also implemented features like support for named imports for JSON modules and running CommonJS modules in a CJS context, alongside improvements to CLI behavior and support for Node.js test runner features.

node-jsesbuildesmruntimetsx

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