Jay Lee, Developer in New York, NY, United States
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Jay Lee

Verified Expert  in Engineering

Full-stack Developer

New York, NY, United States
Toptal Member Since
August 5, 2022

Jay is a full-stack developer with software consulting experience in the insurance, beauty, media, technology, and education industries. At Spotify, he re-platformed an existing legacy Rails 3 monolith web application, delivered a new web design using React and SCSS, and converted existing Ruby on Rails web pages to React. At IBM, he helped scope an MVP, built an administration tool, and introduced E2E testing. Jay is known for hitting deadlines and delivering high-quality, tested projects.


Haven Tech
Angular, Node.js, JavaScript, TypeScript, PostgreSQL, APIs, Full-stack...
React, Node.js, GraphQL, Ruby on Rails (RoR), TypeScript, JavaScript, APIs...
React, Node.js, C#, Windows Presentation Foundation (WPF), PostgreSQL, Hapi.js...




Preferred Environment

MacOS, Git, Visual Studio Code (VS Code), Slack

The most amazing...

...project I've developed is an all-in-one gaming application where users can log in, download games from various sources, and start playing.

Work Experience

Full-stack Developer

2021 - PRESENT
Haven Tech
  • Integrated a message queue system to an administration portal to notify application status updates.
  • Delivered new features to the agent portal where insurance agents can buy or manage insurance policies.
  • Supported customized landing pages for insurance agencies.
  • Added a mock service to decouple and simplify the data flow in the local environment and reduced the waiting time from 30 seconds to less than ten seconds.
Technologies: Angular, Node.js, JavaScript, TypeScript, PostgreSQL, APIs, Full-stack, Full-stack Development, Agile, CSS, HTML, Web Development, Unit Testing, Git, Back-end, Back-end Development, Front-end Development, Software Development, Code Review, Docker, GitLab, Front-end

Stride Software Consultant

2021 - 2021
  • Replatformed an existing legacy Rails 3 monolith web application to the modern version using Node.js, React, TypeScript, and GraphQL.
  • Implemented the website's new design using React and SCSS.
  • Converted existing Ruby on Rails web pages to React and Next.js web pages.
Technologies: React, Node.js, GraphQL, Ruby on Rails (RoR), TypeScript, JavaScript, APIs, Agile, Full-stack Development, Full-stack, CSS, SCSS, HTML, Web Development, Jest, Unit Testing, Google Cloud, PostgreSQL, Git, Back-end, Back-end Development, Test-driven Development (TDD), Redux, Code Review, Next.js, Front-end

Stride Software Consultant

2020 - 2020
  • Built a customer-facing Windows desktop application using C# and WPF where users can log in and play games using either their own account or a Vindex licensed account.
  • Created a customer-facing web application where users can make reservations online and participate in ongoing game tournaments with React.
  • Developed an administration web application where admins and staff can manage reservations using React.
  • Assisted in system design and architecture work for AWS and Terraform. Designed and built a REST API using Node.js and Hapi.js.
  • Participated scoping the MVP and delivered an MVP within the deadline.
Technologies: React, Node.js, C#, Windows Presentation Foundation (WPF), PostgreSQL, Hapi.js, APIs, Agile, Full-stack, Full-stack Development, CSS, SCSS, Webpack, Jest, Unit Testing, Amazon Web Services (AWS), Terraform, Express.js, TypeScript, JavaScript, Back-end, Back-end Development, Back-end Architecture, Front-end Development, Front-end Architecture, Software Development, Test-driven Development (TDD), .NET, Code Review, Docker, Front-end

Stride Software Consultant

2019 - 2020
Blue Apron
  • Implemented a design system in Storybook to mitigate inconsistencies on the website and reduce design debt.
  • Updated React to 16.8 and fixed pipeline issues encountered while upgrading.
  • Refactored and added unit tests to ensure the code met quality standards.
Technologies: React, Storybook, APIs, TypeScript, JavaScript, Full-stack, Full-stack Development, Ruby on Rails (RoR), Ruby, Agile, CSS, SCSS, Jest, Unit Testing, PostgreSQL, Redux, Back-end, Back-end Development, GraphQL, Code Review, Front-end

Stride Software Consultant

2019 - 2019
  • Assisted the client in rebuilding a new team from the ground up and scope their MVP.
  • Built an internal administration tool for IBM users to create outage alerts for core tools. These notify its users through IBM's intranet website using Node.js and Vue.
  • Implemented dark mode and improved web accessibility of the intranet website.
  • Introduced E2E testing using the WebdriverIO framework.
Technologies: Vue, Node.js, TypeScript, JavaScript, WebdriverIO, APIs, Agile, Front-end, Minimum Viable Product (MVP), CouchDB, PostgreSQL, Greenfield, Front-end Development, Back-end Development, Back-end Architecture, Web Development, Test-driven Development (TDD), Code Review

Stride Software Consultant

2018 - 2019
  • Added a feature that helps users pause their subscription for a given period of time to reduce the turnover rate.
  • Addressed various technical debts to make the existing React components reusable.
  • Added A/B testing to the subscription pause feature to minimize risk and increase user engagement.
  • Implemented and published the Ruby on Rails gem to authenticate with a LinkedIn account.
Technologies: React, Ruby on Rails (RoR), TypeScript, Ruby Gems, APIs, Redux, Full-stack, Agile, SCSS, CSS, HTML, Web Development, Jest, A/B Testing, Unit Testing, MongoDB, Storybook, JavaScript, Front-end Development, Back-end Development, Back-end Architecture, Test-driven Development (TDD), Code Review, Front-end

Full-stack Developer

2015 - 2018
  • Implemented a perfume subscription service on the ASP.NET website, which led to the gain of over 3,000 subscribers in the first month.
  • Developed a customer relationship management (CRM) and shipping management Windows desktop application using C# and WPF.
  • Built an automated refund system with C# for returned orders.
Technologies: ASP.NET, C#, Windows Presentation Foundation (WPF), APIs, MSMQ, Subscriptions, Full-stack, Full-stack Development, Microsoft SQL Server, Azure, CSS, jQuery, Payment APIs, Web Development, ASP.NET Razor, MVC Design, JavaScript, Back-end, Back-end Development, Back-end Performance, Back-end Architecture, .NET, ASP.NET MVC 6, Code Review, Front-end

Korean-English Hymn Book Mobile Application

A Korean-English Hymn book mobile application for both Android and iOS. It was initially written in Flutter and later migrated to React Native. Users can view and listen to hymns and search by lyrics. It has over 10,000 downloads on iOS alone.


As the sole developer working on this religious organization's website, I was responsible for the entire project lifecycle, from requirement gathering and technical decision-making to deployment to production. The website is a central hub for members and visitors, allowing them to stay informed about upcoming events and access a library of recorded sermons.
2012 - 2015

Bachelor's Degree in Computer Science

Stony Brook University - Stony Brook, New York, USA


React, Node.js, Vue, jQuery


Git, Slack, WebdriverIO, Webpack, Terraform, GitLab


Express.js, ASP.NET, Windows Presentation Foundation (WPF), .NET, Jest, Redux, ASP.NET MVC 6, Angular, Ruby on Rails (RoR), React Native, Hapi.js, Next.js, Flutter, NestJS


JavaScript, C#, TypeScript, CSS, HTML, SCSS, Java, Ruby, ASP.NET Razor, GraphQL


Test-driven Development (TDD), Unit Testing, Agile, Back-end Architecture, MVC Design, MEAN Stack


MacOS, Visual Studio Code (VS Code), Amazon Web Services (AWS), Azure, Docker


Microsoft SQL Server, PostgreSQL, MongoDB, Google Cloud, CouchDB


Software Development, Full-stack, APIs, Back-end, Web Development, Front-end Development, Full-stack Development, Back-end Development, Front-end Architecture, Front-end, Back-end Performance, Code Review, South Korea, Storybook, Ruby Gems, Minimum Viable Product (MVP), Greenfield, A/B Testing, MSMQ, Subscriptions, Payment APIs

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