Description

If you're looking for a developer who genuinely cares about the longevity of your product, not just the quick and dirty implementation, I'd love to work with you.

I am a full-stack developer specializing in Ruby on Rails and modern JavaScript frameworks, helping companies build and maintain reliable web platforms. My work focuses on delivering production-ready features, improving system performance, and ensuring long-term maintainability.

Most recently, I contributed to one of Japan’s largest platforms connecting volunteers, staff, and part-time workers with NPOs and social enterprises. The platform helps people who want to make a difference reach organizations in need, ensuring that support flows where it matters most. Within a small development team, I designed and implemented features that improved platform functionality and internal workflows, allowing the team to release updates more efficiently.

I also led the vulnerability-management process, helping maintain the security and stability of the production environment. In addition, I managed a major framework upgrade from Ruby 2.5 / Rails 5.2 to Ruby 3 / Rails 7, resolving compatibility issues and delivering the migration on schedule.

On the frontend side, I spearheaded the migration from the Sprockets asset pipeline to esbuild, enabling a modern JavaScript workflow and better support for React while keeping the codebase clean and maintainable.

Beyond my professional work, I built FrenchPen.work, an AI-assisted platform that provides advanced feedback and analysis for learners preparing for French exams such as TCF and DELF. The project strengthened my ability to design systems end-to-end and deploy practical solutions independently. I have also learnt how to integrate LLM into an application.

Languages

English
Native or bilingual
French
Conversational
Japanese
Native or bilingual

Workplace preferences

Can work on-site

Montpellier (up to 10km)

activo inc.
Full Stack Web Developer
August 2022 - November 2025 (3 years and 3 months)
Kyoto, Japan
Contributed to one of Japan’s largest platforms connecting volunteers, staff, and part-time workers with NPOs and social enterprises—helping people who want to make a difference reach organizations in need and ensuring that support flows where it matters most.

-Key Achievements
・Designed and delivered new features that enhanced platform functionality and improved cross-team communication, enabling faster release cycles.
・Led the vulnerability-management process to maintain production security and stability.
・Upgraded the stack from Ruby 2.5/Rails 5.2 to Ruby 3/Rails 7, resolving compatibility challenges and meeting all milestones on schedule.
・Spearheaded migration from the legacy Sprockets asset pipeline to esbuild, streamlining the JavaScript build process and supporting modern React development while maintaining clean, well-documented code.

-Tech Stack
・Backend: Ruby on Rails 7 with Ruby 3
・Frontend: JavaScript (React)
・Testing: RSpec
・Search: Elasticsearch
・Caching/Queues: Redis
・Databases: MySQL
・Infrastructure: AWS, Docker, Fastly
・CI/CD: CircleCI, GitHub
・Collaboration: Notion, Slack
Ruby on Rails Ruby Typescript JavaScript React.js
ProVocalTips
Self employed
February 2022 - December 2022 (10 months)
Tokyo, Japan
Built a web marketplace that allows vocal students to get feedback on their singing from vocal teachers to help vocalists improve more flexibly online and instructors increase their online presence. Was responsible for ideation of the project, database design, backend & frontend coding, UI design, content marketing. Worked with a lawyer to make sure that the service is compliant with Japanese and International law. Worked with Body N Voice Studios to get feedbacks on the concepts of the app and improve the UI/UX & functionalities.
JavaScript React.js Ruby on Rails
ICE
Senior Client Support Specialist
October 2019 - September 2021 (1 year and 11 months)
Tokyo, Japan
Was responsible for the quality, responsiveness and timeliness of day-to-day institutional client support tasks mainly via emails and phone calls, internally collaborating with team members, sales teams, and account managers. Regularly had meetings with clients to answer their technical questions, listen to their business needs, and demo ICE products. Implemented a financial data delivery strategy for a particular client by articulating and revising internal work flow. (The delivery was initially 3 months, and it got down to 3 weeks.)