Seiichi Yonezawa

Freelance Web Developer

About me

I am a freelance web developer with 8 years of experience, specializing in Ruby on Rails.

Over the years, I have contributed to the growth of companies in the fields of medicine, finance, and education by building scalable and efficient web applications. My expertise in Rails allows me to develop robust backend systems while ensuring seamless integration with modern front-end technologies.

Beyond Rails, I have strong skills in JavaScript, TypeScript, and React, enabling me to build dynamic and interactive user interfaces. Additionally, I have experience working with Node.js and Python, giving me flexibility in backend development. My deep understanding of SQL and server architecture allows me to design and optimize databases while also setting up and managing server infrastructure from scratch.

Personal Projects

Skills and Experiences

Frontend

  • React, Next.js
  • Vue, Nuxt.js
  • jQuery
  • Bootstrap

Backend

  • Ruby on Rails, Ruby
  • Express, Node.js
  • GraphQL
  • MySQL, PostgreSQL

DevOps

  • Git, GitHub
  • Docker
  • Terraform, AWS
  • Circle CI

Joined Works

for Cloud Funding
for Cloud Funding

Ruby on Rails

for Private Cram School
for Private Cram School

Nuxt.js and Rails

for Medical Conference
for Medical Conference

React and Rails

for Email Magazine Service
for Email Magazine Service

Ruby on Rails

MA Tool
MA Tool

React and Rails

OAuth2 Server
OAuth2 Server

Express.js