Shunya078

Web Developer

About

Introduction

Shunya078

I'm a Web Developer and Design System Product Owner at a company operating Japan's largest energy wholesale trading marketplace. I build and maintain a shared design system used across 10+ products, driving consistent UI/UX and improving frontend development efficiency.

Skills

ReactTypeScriptNext.jsChakra UIDesign SystemsFigmaStorybookTanStack QueryNode.jsTailwind CSS

Media & Awards

  • Featured in Web Designing Magazine — "Design Systems: Case Studies and Insights"
  • eSquare Live won the Good Design Award (contributed through design system technology)

Career

Experience

2022 - - Present

enechain

Web Developer / Design System PO

Served as a frontend tech lead within the team at a startup operating Japan's largest energy wholesale trading marketplace. Built and maintained a shared design system across 10+ products. Led the design and development of a Chakra UI-based component library, including dark mode support, accessibility improvements, and i18n integration.

2021/02 ~ 2022/09

ispec inc.

Frontend / Backend Engineer

Worked on diverse web application development including EC, mobile ordering, and SaaS products. Primarily focused on frontend development with Nuxt/Vue and Next/React, while also handling backend development in Ruby. Served as lead engineer on multiple projects, facilitating development processes and managing teams.

Speaking

Talks

JS Conf JP 2024

4.8k views

Our Design System is Upgrading to Chakra v3

2024-11-23

SpeakerDeck

Web Developer Conference 2024

540 views

Building an Organization-Wide Design System from an Engineer's Perspective

2024-09-07

SpeakerDeck

リンケージ × enechain toBシステム開発勉強会

170 views

enechain Frontend Architecture / Design System Integration

2024-03-13

SpeakerDeck

Blog

Articles

2025-12

From a Small Efficiency Tool to a Shared Team Foundation

How an internally developed DevTool for numerical calculation visualization and verification grew from a small efficiency improvement into a shared platform used by QA teams and stakeholders at enechain.

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2024-12

The Growth of Our Design System — And How We Face It Going Forward

A retrospective on our design system updates in 2024, covering dark mode support, accessibility improvements, i18n integration, and our future direction.

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2024-08

Getting Started with Regression Testing Using Playwright + MSW

An introduction to implementing frontend regression testing under authenticated environments using Playwright and MSW, as adopted for enechain's Japan Climate Exchange (JCEX).

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2023-12

Why We Build a Design System

The story of how our design system was born at enechain — from grassroots component sharing to a formal design system team.

Read article

Contact

Links

Twitter / X
GitHub
SpeakerDeck