Tomoyuki Kashiro
Web Developer at Freelance
Tokyo, Japan
Summary
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RockstarTomoyuki Kashiro is a senior frontend engineer and web developer based in Tokyo with 13–15 years of experience building high-performance, user-focused web applications. He specializes in performance optimization, technical debt reduction, and translating ambiguous product requirements into scalable architectures, having driven measurable outcomes like +20% Lighthouse scores and a 30% codebase reduction. Comfortable across TypeScript, React/Next.js/Remix, Node.js and cloud CI/CD, he pairs engineering decisions with business metrics to accelerate delivery and reduce maintenance costs. A hands-on technical lead and former project manager, he has led design-system efforts and taught front-end security and TDD at scale. Currently exploring AI-driven developer workflows (Agent Ops), he brings a pragmatic, data-driven approach to blending UX, security, and performance.
13 years of coding experience
9 years of employment as a software developer
Japanese, Chinese
Stackoverflow
21reputation
2kreached
0answers
1question
Github Skills (122)
sketch10
linux10
compiler10
shopify-app10
gatsby10
shopify10
static-site-generator10
gatsby-plugin10
fastest10
accelerated-mobile-pages10
pipe10
angular-component10
oclif10
angular-library10
sketch-plugin10
Programming languages (9)
Github contributions (5)
tomoyukikashiro/chrome-devtools-fun
Apr 2019 - May 2020
You can search chrome devtools updates and functions
Contributions:70 PRs, 64 pushes, 69 branches in 1 year 1 month
javascriptupdateschromedevtoolschrome-devtools
tomoyukikashiro/sencha-image-grid-list
Jan 2013 - May 2014
Contributions:38 commits in 1 year 3 months
senchagrid-componentgridtouch
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