Saburo Suzuki, Developer in Tokyo, Japan

Saburo Suzuki

Software Developer

Tokyo, Japan
Toptal Member Since
October 1, 2017

Saburo is a full-time freelancer with 15 years of development experience. In his career, he has worked on web development and is exceptionally skilled in Ruby on Rails, PHP, and JavaScript and its frameworks. Saburo communicates complex ideas clearly and accurately and works well in teams of all sizes.

Saburo is available for hire
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Beyond Finance, LLC
Ruby on Rails (RoR), PostgreSQL, Amazon Web Services (AWS), RSpec, Sidekiq...
React, Node.js, PostgreSQL, Next.js, Tailwind CSS, Cypress
Thirty Madison Inc
Cypress, RSpec, Apollo, GraphQL, React, TypeScript, Ruby on Rails (RoR), Ruby


Tokyo, Japan



Preferred Environment

Visual Studio Code (VS Code), GitHub, Sublime Text, OS X, Ubuntu

The most amazing...

...project I've worked on is an online search portal for rentals, where I worked as a senior developer using React, Next.js, and Tailwind CSS.

Work Experience

2022 - 2023

Back-end Senior Ruby on Rails Developer

Beyond Finance, LLC
  • Converted the business logic from the old Node.js project to a new Ruby on Rails project.
  • Wrote down RSpec tests and provided 100% code coverage.
  • Implemented a comprehensive job system with Sidekiq and integrated it with Salesforce API.
Technologies: Ruby on Rails (RoR), PostgreSQL, Amazon Web Services (AWS), RSpec, Sidekiq, Salesforce API, Node.js
2020 - 2022

Software Engineer and Full-stack Developer

  • Implemented primary search functions for hotels, villas, houses, and resorts. The front end was built with React, and Next.js was used for server-side rendering.
  • Built a multi-lingual system on the front end and optimized the bundler to improve performance.
  • Introduced Cypress for front-end E2E testing and implemented A/B testing to analyze user experiences.
  • Wrote REST APIs for new features and implemented administration portals to manage base information on databases.
Technologies: React, Node.js, PostgreSQL, Next.js, Tailwind CSS, Cypress
2018 - 2019

Full-stack Developer

Thirty Madison Inc
  • Developed an API with GraphQL on Ruby on Rails (RoR) for customers and doctors.
  • Created the UI/UX with React and Styled-components and supported a responsive design with SCSS.
  • Wrote down back-end and front-end test cases with RSpec and Cypress.
Technologies: Cypress, RSpec, Apollo, GraphQL, React, TypeScript, Ruby on Rails (RoR), Ruby
2018 - 2018

Senior Front-end Developer

S3: Shapiro Settlement Solutions (via Toptal)
  • Developed a single-page application that is used as a management tool for law entities; used React and Apollo.
  • Created AWS Lambda functions to track and store the details of law entities.
  • Updated the back end and GraphQL.
Technologies: Microservices, AWS Lambda, Express.js, Node.js, GraphQL, React
2012 - 2016

Lead Developer

  • Developed REST APIs for web and iOS applications.
  • Built a single-page application with Angular and React.
  • Developed SaaS products with a team.
  • Led the development of a job-posting system.
  • Developing real-estate management with Laravel/Vue.js.
Technologies: MERN Stack, MEAN Stack, Ruby on Rails (RoR)
2009 - 2011

Web Developer

  • Developed eCommerce websites.
  • Built custom CMS and SaaS products.
  • Contributed, as a team member, to the development of a social network.
Technologies: Ruby, AngularJS, PHP, Ruby on Rails (RoR)


Online Search Portal for Rentals
Developed with JavaScript, the back end was built in Node.js and Express.js. The front end is in React, Next.js, and Tailwind CSS. I worked primarily as a senior developer on search enhancements and multi-lingual systems, upgraded bundles, and improved server-side rendering features.

Migraine Treatments
Take control of your migraines with personalized treatment and continuous online support from doctors.

The back end was developed using Ruby on Rails and GraphQL. The front end was built using React and TypeScript. I worked as a full-stack developer focusing on user experience.

Social Network

I developed a formal social network that targeted college students.

Technologies: PHP, CodeIgniter

Online Beanie Shop

This eCommerce site was built with WooCommerce and sells beanies to women with cancer and other diseases that cause hair to fall out.

Gift Card Store

This is an eCommerce project that was done for an online card store.

Technologies: Ruby on Rails

Online Job Posting System

I developed a job posting system to purchase a freelancing service as a project manager and team leader. It supports only small tasks such as content writing, graphical designs, and research.

Technologies: Ruby on Rails

Fitness App

I developed a fitness application and worked as a full-stack developer on this project. This was built with a REST API and as a standalone web app; the REST API also supports the iOS application.

Account Management System
I developed a SaaS product that allows a customer to manage their Stripe account and clients easily. It also supports a JavaScript library that works on any other site, shows the history of each customer transaction, so clients can use that library to encourage their customers.

Technologies: Ruby on Rails

Online Dating Network

I developed an online dating website that targeted users in India. The interesting thing about this site was that a user could create multiple profiles for his or her relatives (son, daughter, brother, sister, and more).

This site was built with AngularJS and the back-end was built with Ruby on Rails.



TypeScript, Ruby, JavaScript, PHP, CSS, HTML, Python, GraphQL


CodeIgniter, Angular, Ruby on Rails (RoR), Laravel, Express.js, Next.js, React Native, Redux, Django, Tailwind CSS, AngularJS, Cypress


React, Node.js, jQuery, Vue, Redux-Saga, Sidekiq, Salesforce API, Stripe API


Sublime Text, Webpack, RSpec, React Apollo, RubyMine, GitHub


Functional Programming, Agile Software Development, MEAN Stack, Concurrent Programming, Microservices


Linux, MacOS, Ubuntu, OS X, AWS Lambda, Amazon Web Services (AWS), Visual Studio Code (VS Code)


Redis, MySQL, PostgreSQL, MongoDB


Web Development, Senior Web, Styled-components, MERN Stack, Apollo, Full-stack Development


2004 - 2008

Bachelor's Degree in Information and Communication Technology

University of Tokyo - Tokyo, Japan