Takashi Toyoshima
Senior Software Engineer at Google
Kawasaki, Japan
Summary
🤩
Rockstar🎓
Top SchoolTakashi Toyoshima is a Senior Software Engineer with 15 years of experience blending systems, browser, and hardware expertise, currently contributing to Chrome’s Web MIDI and Chrome OS efforts at Google. His career spans low-level hardware design for Fujitsu’s K computer to architecting network and media features in Chromium, including measurable contributions to the Chromium codebase and web-platform-tests. He has deep protocol and backend experience—improving WebSocket implementations and evolving WebRequest metrics used by extensions—alongside a track record of stabilizing flaky web-platform tests. A Ph.D. from The University of Tokyo, he pairs rigorous research skills with hands-on engineering across embedded game consoles, supercomputing interconnects, and modern browser stacks. Notably, his work touches both product-facing features and instrumentation, showing a habit of making systems both functional and measurable. Based in Kawasaki, Japan, he brings a rare blend of hardware, research, and large-scale open-source browser development experience.
15 years of coding experience
11 years of employment as a software developer
University of Tokyo
Stackoverflow
328reputation
102kreached
2answers
0questions
Github Skills (25)
javascript10
c-language10
python10
testing10
http10
websocket10
websockets-client10
network-protocol10
websocket-client10
cprogramming-language10
client-websocket10
test-automation10
browser9
metric9
web-standards9
Programming languages (10)
Github contributions (5)
googlearchive/pywebsocket
Jul 2011 - Mar 2013
WebSocket server and extension for Apache HTTP Server for testing
Role in this project:
Back-end Developer
Back-end DeveloperContributions:66 commits in 1 year 8 months
Contributions summary:Takashi primarily worked on improving the pywebsocket project, focusing on WebSocket server functionality. Their contributions involved updating the protocol to support newer HyBi versions (08, 09, 10), which included renaming files and modifying import statements to align with the changes. Additionally, the user addressed issues related to HTTP fallback mechanisms, incorporating checks for origin and version headers, and implementing the appropriate HTTP status code responses for handshake failures.
testingapache-httpwebsocket-serverapachewebsocket
chromium/chromium
Oct 2019 - Jan 2023
The official GitHub mirror of the Chromium source
Role in this project:Back-end Developer
Back-end DeveloperContributions:25 commits in 3 years 3 months
Contributions summary:Takashi primarily focused on modifying and adding metrics related to the WebRequest API, specifically in the context of Chromium extensions. The user added metrics to track the number of extensions using WebRequest, DeclarativeWebRequest, and WebView permissions. Further work involved fixing a metric related to proxy decision, and optimizing it to include the detailed reasons for its use. They also refactored and added functionalities within the Web MIDI system, including changes in the USB-based Android backend and associated tests.
chromiumgithub-mirrorchrome
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