Jay Chen, Developer in Rockingham, Australia
Jay is available for hire
Hire Jay

Jay Chen

Verified Expert  in Engineering

React Developer

Rockingham, Australia
Toptal Member Since
June 16, 2022

Jay is a senior front-end developer with over ten years of experience designing and building responsive web design for various industries. He is proficient in HTML, CSS, and JavaScript, plus modern JavaScript frameworks like React and Vue. With extensive UX and user psychology knowledge, Jay is passionate about creating solid web applications and learning new technologies.


Saverd, LLC
JavaScript, Chrome Extensions, CSS, Tailwind CSS, HTML, Firefox Extensions...
PixieBrix, Inc.
JavaScript, HTML, CSS, Webpack, Chrome Extensions, Firefox Extensions...
React, Redux, Chrome Extensions, ES7, Agile, GitHub...




Preferred Environment

React, Angular, Vue, Node.js, JavaScript, TypeScript, Next.js

The most amazing...

...and popular solution I've worked on is a web app and a Chrome extension app for Apollo.io., which has more than 100,000 active users.

Work Experience

Senior Browser Extension Developer

2023 - 2023
Saverd, LLC
  • Developed extension from the scratch using latest tech stacks in MV3.
  • Updated and ported extensions to Firefox and Safari.
  • Implemented an Authentication Layer in the extension for user authorization.
Technologies: JavaScript, Chrome Extensions, CSS, Tailwind CSS, HTML, Firefox Extensions, Safari Extensions, GitLab, APIs, Auth0 API

Browser Extension Engineer

2022 - 2022
PixieBrix, Inc.
  • Created a prototype of inferred selector in the PixieBrix Chrome extension.
  • Implemented style isolation with the help of React Shadow DOM for a UI automation startup.
  • Updated the logic of selecting similar elements in the website using lower code.
Technologies: JavaScript, HTML, CSS, Webpack, Chrome Extensions, Firefox Extensions, TypeScript 2, jQuery, Chrome API, Tailwind CSS, TypeScript, Cypress

Senior Front-end Engineer

2021 - 2022
  • Worked as a senior front-end developer on building a sales intelligence and engagement platform.
  • Used React, Redux, and other libraries to implement a sleek and modern UI/UX.
  • Contributed to building an industry-leading Chrome extension app that achieved over 100,000 active users.
  • Implemented Gmail and Google Calendar extensions as part of my role.
  • Applied Cypress testing framework for end-to-end and regression testing.
Technologies: React, Redux, Chrome Extensions, ES7, Agile, GitHub, Visual Studio Code (VS Code), JavaScript, CSS, HTML, GraphQL, Apollo, TypeScript, AWS Lambda, Amazon Web Services (AWS), Cypress, Bootstrap

Senior Front-end Developer

2017 - 2019
Telegraph Creative
  • Built customized, well-structured, and maintainable components throughout a mobile app using React Native and Node.js.
  • Focused on improving UI/UX with the introduction of styled components.
  • Integrated unit testing and end-to-end testing using Jest and Enzyme.
Technologies: React Native, React, Node.js, Vue, Agile, Next.js, Express.js, GitHub, Visual Studio Code (VS Code), ES7, JavaScript, CSS, HTML, Amazon Web Services (AWS), PHP, Python, Bootstrap

Front-end Developer | Full-stack Developer

2014 - 2017
  • Cooperated with designers to create clean interfaces and simple, intuitive interactions and experiences.
  • Worked with a senior developer to manage large, complex design projects for corporate clients.
  • Completed detailed programming and development tasks for the front-end app as well as challenging back-end server code.
  • Covered unit tests to discover errors and assure quality.
Technologies: React, Redux, Node.js, PostgreSQL, Express.js, TypeScript, Agile, GitHub, Visual Studio Code (VS Code), ES7, JavaScript, CSS, HTML, AWS Lambda, Amazon Web Services (AWS), PHP, Python, Bootstrap, Laravel

Web Developer

2011 - 2013
Blue Butterfly
  • Worked as a front-end developer for building single-page applications and SaaS products.
  • Focused on AngularJS, model-view-controller (MVC)-based frameworks, and Node.js.
  • Built highly responsive and pixel-perfect UI/UX, user-intuitive graphs, and data visualizations.
Technologies: AngularJS, Node.js, GitHub, ES7, JavaScript, CSS, HTML, MongoDB, Vue 2, Firebase, Angular, TypeScript, ASP.NET, PHP, Python, Laravel


StudyKIK is a React-based web app for patient recruitment service that helps users find a study that's right for them and is committed to making the process of finding and joining a clinical trial safe, secure, and easy to understand.

Apollo Email Finder and Open Tracker

Apollo.io is a sales intelligence and engagement platform. I was responsible for building a 100,000+ active users Chrome extension app cloned from the web app. I worked with the team to build a solid app with high user reviews.

Lottery Widget

I created a React and TypeScript-based lottery widget for a well-known company. I used React/Redux, TypeScript, and Node.js, implemented server-side rendering (SSR), and applied sleek UI design, pixel-perfect, responsive, and modern styles.

Chrome Extension for a Low-code Platform for Extending the Web Application

I contributed to the open source Chrome extension project, which included building and extending new functionalities and features in the existing product. I also polished the product's styles and look and feel and reviewed the code with the team members.


ES7, JavaScript, CSS, HTML, PHP, TypeScript, Python, TypeScript 2, GraphQL


Redux, React Native, Cypress, Bootstrap, Express.js, AngularJS, Tailwind CSS, Angular, ASP.NET, Laravel, Next.js


React, Node.js, Vue 2, Vue, jQuery, Chrome API, Auth0 API


GitHub, Webpack, GitLab


Visual Studio Code (VS Code), Amazon Web Services (AWS), AWS Lambda, Firebase


Software Engineering, Web Development, Chrome Extensions, Firefox Extensions, Apollo, Safari Extensions, APIs




PostgreSQL, MongoDB

2006 - 2008

Bachelor's Degree in Computer Science

University of Technology Sydney - Sydney, Australia