Masaaki Sumimoto
フリーランスWebデザイナー フリーランスUIデザイナー フリーランスWebコーダー at _
Kobe, Japan
Summary
👤
Senior🎓
Top SchoolMasaaki Sumimoto is a Kobe-based freelance Web and UI designer and front-end engineer with 9 years of experience blending pixel-perfect design and production-grade front-end engineering. He routinely bridges design and development gaps at organizations by applying DesignOps practices and modern generative AI tools (Claude Code, Gemini, NotebookLM, Figma Make) to accelerate workflows and prototyping. His projects include municipal websites, a large-scale legacy SaaS refactor (20,000+ lines of CSS/JS), and front-end implementations for prime-tier clients, alongside reusable tools like the MapNJ npm module and Color Scale plugins for Figma/Adobe XD. Comfortable across Next.js/Nuxt.js/Astro, Tailwind, GSAP/three.js animations, and deployment pipelines, he brings both creative motion design and solid engineering rigor. Currently available for small, spot engagements while engaged in long-term contracts, he combines hands-on coding with practical AI-enhanced design operations to unblock teams and ship polished interfaces.
9 years of coding experience
8 years of employment as a software developer
兵庫県立姫路南高等学校
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (4)
adobe-xd8
figma3
figma-plugin2
webpack2
Programming languages (4)
Github contributions (5)
masa-sumimoto/my-web-starter_webpack
Jul 2018 - Dec 2021
This is my starter kit for creating website with Webpack4.
Contributions:5 PRs, 114 pushes, 5 branches in 3 years 5 months
webpack
masa-sumimoto/mapnj
Jul 2024 - Jul 2026
A script to add interactivity to SVG-based illustration maps
Contributions:3 releases, 4 PRs, 10 pushes in 1 year 11 months
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