Koji Yamauchi
Web Developer at Freelance
Tokyo, Japan
Summary
👤
SeniorKoji Yamauchi is a Tokyo-based web developer with 10 years of experience building polished front-end experiences and occasional Node.js backends for clients ranging from Adidas and Nissan to DMM.com and ZOZO Technologies. He specializes in modern TypeScript stacks—React, Next.js, Prisma, tRPC, Supabase and GraphQL—paired with pragmatic tooling like Tailwind, Webpack, and GitHub Actions to ship production-ready sites. As a long-time freelancer he blends visual design skills (Photoshop, Illustrator, Behance portfolio) with engineering discipline, often delivering full design-to-code implementations. He maintains a public portfolio and GitHub, and keeps a private portfolio for select clients, reflecting both breadth of enterprise work and attention to curated, high-quality projects.
10 years of coding experience
2 years of employment as a software developer
Japanese, English
Github Skills (8)
starter-kit8
react7
javascript7
koji7
typescript6
webpack6
css3
frontend2
Programming languages (4)
Github contributions (5)
kojiyamauchi/micro-blood-science
Jan 2018 - Nov 2018
Website of Micro Blood Science.
Contributions:18 PRs, 179 pushes, 19 branches in 10 months
opensciencebloodsciencedata-science
kojiyamauchi/static-my-starter
Oct 2020 - Aug 2022
Static My Starter. 🍔
Contributions:71 PRs, 105 pushes, 75 branches in 1 year 10 months
reacttemplate
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