Saburo Suzuki, Developer in Tokyo, Japan
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Saburo Suzuki

Verified Expert  in Engineering

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.


Beyond Finance, LLC
Ruby on Rails (RoR), PostgreSQL, Amazon Web Services (AWS), RSpec, Sidekiq...
React, Node.js, PostgreSQL, Next.js, Tailwind CSS, Cypress, Front-end...
Thirty Madison Inc
Cypress, RSpec, Apollo, GraphQL, React, TypeScript, Ruby on Rails (RoR), Ruby...




Preferred Environment

GitHub, Angular, Vue, Redux-Saga, React Apollo

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

Back-end Senior Ruby on Rails Developer

2022 - 2023
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, Web Development, MySQL, Ruby, Agile Software Development, GitHub, Redis, Back-end

Software Engineer and Full-stack Developer

2020 - 2022
  • 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, Front-end, JavaScript, Web Development, Agile Software Development, Redux, GitHub, Microservices, Redux-Saga, Amazon Web Services (AWS), Full-stack Development, CSS, HTML, Back-end, Webpack, MERN Stack

Full-stack Developer

2018 - 2019
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 back-end and front-end test cases with RSpec and Cypress.
Technologies: Cypress, RSpec, Apollo, GraphQL, React, TypeScript, Ruby on Rails (RoR), Ruby, Front-end, JavaScript, Web Development, MySQL, Agile Software Development, Redux, GitHub, Redux-Saga, React Apollo, Sidekiq, Full-stack Development, Stripe API, CSS, HTML, Redis, Back-end, Webpack

Senior Front-end Developer

2018 - 2018
S3: Shapiro Settlement Solutions (via Toptal)
  • Developed a single-page application using React and Apollo. The app is used as a management tool for law entities.
  • Created AWS Lambda functions to track and store the details of law entities.
  • Updated database structure and implemented a new GraphQL API.
Technologies: Microservices, AWS Lambda, Express.js, Node.js, GraphQL, React, Front-end, JavaScript, Web Development, Agile Software Development, PostgreSQL, Redux, MongoDB, GitHub, Redux-Saga, React Apollo, Apollo, Amazon Web Services (AWS), CSS, HTML, Webpack

Lead Developer

2012 - 2016
  • 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), Angular, Vue, JavaScript, Web Development, PHP, MySQL, Ruby, Agile Software Development, Node.js, MongoDB, Django, Python, Amazon Web Services (AWS), Full-stack Development, Stripe API, CSS, HTML, Back-end

Web Developer

2009 - 2011
  • Developed eCommerce websites.
  • Built custom CMS and SaaS products.
  • Contributed, as a team member, to the development of a social network.
Technologies: Ruby, AngularJS, Ruby on Rails (RoR), Web Development, JavaScript, PHP, MySQL, Agile Software Development, Django, Python, Amazon Web Services (AWS), Full-stack Development, Stripe API, CSS, HTML, MEAN Stack

Beyond Finance

A financial service that I implemented with Ruby on Rails. An old service was implemented with Node.js and had a low-quality code structure. I worked as a back-end developer and implemented financial service and estimation logic with the new platform.

Online Search Portal for Rentals
An 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.

The system gathers property information from 3rd-party vendors and shows it to users based on search queries. I worked primarily as a senior developer and implemented search features 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.

It requests users to answer their questions about circumstances, and an assigned online doctor will check the result and provide the prescription and medicines.

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

Social Network

I developed a formal social network that targeted college students. This application allows users to post news and technologies, chat and group discussions, and a scheduling and mailing system.

Technologies: PHP, CodeIgniter.

Online Beanie Shop
This eCommerce site sells beanies to women with cancer and other diseases that cause hair to fall out.

The website was built with WordPress, WooCommerce, Bootstrap, and jQuery. I built it by myself from scratch.

Gift Card Store

An eCommerce website that sells gift cards for children. It was built with PHP, had an old design style, and lacked UI/UX.

I worked as a full-stack developer and redesigned the website from scratch.
Ruby on Rails was used to implement back-end logic, and a new responsive design was used for the front end.

Technologies: Ruby on Rails, Sidekiq, Redis, PostgreSQL, Bootstrap, and Stripe API integration.

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.

Technologies: Ruby on Rails, REST API, Sidekiq, Redis, React.

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

Technologies: Ruby on Rails, Sidekiq.

Online Dating Network

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

This site was built with AngularJS, and the back end was built with Ruby on Rails.
2004 - 2008

Bachelor's Degree in Information and Communication Technology

University of Tokyo - Tokyo, Japan


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


Webpack, RSpec, React Apollo, GitHub


Angular, Ruby on Rails (RoR), Express.js, Next.js, React Native, Redux, Django, Tailwind CSS, AngularJS, Cypress, Ruby on Rails 4


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


Agile Software Development, MEAN Stack, Microservices


Redis, MySQL, PostgreSQL, MongoDB


AWS Lambda, Amazon Web Services (AWS)


Web Development, Front-end, Back-end, Apollo, MERN Stack, Full-stack Development

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