Tsuyoshi Horo
Senior Software Engineer at Google
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolTsuyoshi Horo is a Senior/Staff Software Engineer based in Tokyo with 14 years of experience building and testing core browser technologies at Google, specializing in Chrome, ChromeOS, and Japanese IME. He combines front-end UI work—contributing to high-profile projects like Chrome DevTools—with back-end Chromium engineering and deep test automation across web-platform-tests and gecko-dev. His contributions include surfacing Signed HTTP Exchange (SXG) details in DevTools, fixing complex build and content-decoding regressions, and hardening service worker and web bundle behaviors through targeted tests. Known for bridging product-facing UI improvements with low-level platform reliability, he brings an engineer’s rigor from The University of Tokyo and practical enterprise experience dating back to Nomura Research Institute.
14 years of coding experience
4 years of employment as a software developer
University of TokyoBS, Engineering, BS, Engineering at Kyoto University
Github Skills (17)
javascript10
c-language10
webpagetest10
testing10
chromium10
ui-design10
devtools10
service-worker10
uid10
front-end-development10
webtest10
cprogramming-language10
developer-tools10
web-testing10
chrome9
Programming languages (10)
Github contributions (5)
ChromeDevTools/devtools-frontend
Sep 2015 - Mar 2020
The Chrome DevTools UI
Role in this project:
Front-end Developer
Front-end DeveloperContributions:39 commits in 4 years 6 months
Contributions summary:Tsuyoshi primarily focused on enhancing the Chrome DevTools frontend, specifically contributing features related to Signed HTTP Exchanges (SXG). Their work involved integrating SXG-related information into the DevTools UI, including the Preview panel and Network panel. They implemented changes to display SXG header details, certificate information, and error messages, as well as modifying the display of network requests to indicate SXG origin. The user added the "from prefetch cache" information in the network tab. They also addressed UI issues and improved the presentation of data within the DevTools interface.
instrumentationreactjavascriptchromecdp
web-platform-tests/wpt
Feb 2017 - Feb 2022
Test suites for Web platform specs — including WHATWG, W3C, and others
Role in this project:Front-end Developer
Front-end DeveloperContributions:50 commits in 5 years
Contributions summary:Tsuyoshi primarily contributed to the test suite for Web platform specifications, particularly focusing on the service workers and related features. Their commits involved implementing and revising tests related to content encoding, navigation preload and subresource loading with the focus on the correct behavior of web bundles. The user's contributions included adding tests that cover various aspects of the web platform, such as the handling of content encoding during navigation preload, and tests of SubresourceWebBundles with the focus on security and related behaviours.
microsoft-edgetest-runnerspecssafarifirefox
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