Hi everyone, thanks to visit my profile page!

I’m a Full-Stack Engineer based in Tokyo with over 6 years of experience, specializing in frontend development using modern JavaScript frameworks and Flutter.

I’ve built and maintained web, mobile, and desktop applications using technologies like React, Flutter, and Electron. My work spans from single-page applications to mobile-first platforms and cross-platform desktop apps.

I'm passionate about building great software products, writing clean and scalable code, and contributing to strong and effective engineering teams.

Web frontend development / Web API development / Mobile application development / Desktop application development / Chrome extension development

Languages & Frameworks: JavaScript, TypeScript, Dart, React, Next.js, Node.js, NestJS, Flutter, Electron

Cloud & Tools: AWS, GitHub Actions, CI/CD, Docker, Firebase

• EIS ltd(2025/2~Now)
  • Senior FullStack Developer
• Commmune(2022/4~2025/1)
  • Software engineer, Mobile app
    • Work on implementing Mobile App with Dart(Flutter).
    • Lead a mobile team as a teamlead.
• Zipunk(2021/3~now, side job)
  • Software engineer, Frontend
    • Work on implementing B2B video collaboration Saas "Quden" with TypeScript(React, Next, Nest...).
    • Work on implementing chrome extension for quden.
• Leverages(2020/4 ~ 2022/3)
  • Software engineer, Frontend
    • Worked on implementing a mobile app with Dart(Flutter)
    • Worked on implementing a Saas system with Golang(go-swagger) and TypeScript(Nuxt)
    • Worked on implementing a toC media with TypeScript(Next with apollo client, apollo server, grpc etc...)
• Photream(2019/2 ~ 2020/3)
  • Software engineer, Full stack
    • Worked implementing on a admin system with Ruby(RubyOnRails) and JavaScript(react-rails).
    • Worked implementing on a management system with Ruby(RubyOnRails) and TypeScript(React).

• Vocabview

  • An English vocabulary learning app that aims to memorize words with images, implemented in Flutter.
  • Link: https://apps.apple.com/jp/app/vocabview/id6458540984

• ushimaru.dev

  • A blog site to write about my output and thoughts, implemented in Next.js.
  • Link: https://www.ushimaru.dev/

• University of the People

  • I am studying Computer Science in UoPeople(2023/11~).