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I’m Jack Chen, a frontend engineer passionate about building fast, accessible interfaces that users love. I specialize in React and TypeScript, and I’ve shipped features that scale to millions of users across web apps. I thrive in cross-functional teams, value clean code and performance, and enjoy turning complex ideas into intuitive experiences. I’m always learning, contribute to design systems and testing, and focus on accessibility improvements to ensure delightful experiences for all users.…I’m Jack Chen, a frontend engineer passionate about building fast, accessible interfaces that users love. I specialize in React and TypeScript, and I’ve shipped features that scale to millions of users across web apps. I thrive in cross-functional teams, value clean code and performance, and enjoy turning complex ideas into intuitive experiences. I’m always learning, contribute to design systems and testing, and focus on accessibility improvements to ensure delightful experiences for all users.

Jack Chen

Front-End Developer, Programmer, Developer, +5

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I’m Jack Chen, a frontend engineer passionate about building fast, accessible interfaces that users love. I specialize in React and TypeScript, and I’ve shipped features that scale to millions of users across web apps. I thrive in cross-functional teams, value clean code and performance, and enjoy turning complex ideas into intuitive experiences. I’m always learning, contribute to design systems and testing, and focus on accessibility improvements to ensure delightful experiences for all users.…I’m Jack Chen, a frontend engineer passionate about building fast, accessible interfaces that users love. I specialize in React and TypeScript, and I’ve shipped features that scale to millions of users across web apps. I thrive in cross-functional teams, value clean code and performance, and enjoy turning complex ideas into intuitive experiences. I’m always learning, contribute to design systems and testing, and focus on accessibility improvements to ensure delightful experiences for all users.

Available to hire

I’m Jack Chen, a frontend engineer passionate about building fast, accessible interfaces that users love. I specialize in React and TypeScript, and I’ve shipped features that scale to millions of users across web apps.

I thrive in cross-functional teams, value clean code and performance, and enjoy turning complex ideas into intuitive experiences. I’m always learning, contribute to design systems and testing, and focus on accessibility improvements to ensure delightful experiences for all users.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Frontend Engineer at Runway

May 1, 2023 - Present

Spearheaded development of AI-powered creative tools and video editing features using React, Next.js, TypeScript, and Redux, accelerating time-to-market for flagship launches. Collaborated with product, design, and ML teams to integrate generative AI models directly into the UI, driving a 40% increase in engagement. Improved media workflow performance by optimizing state management, component rendering, and GraphQL API integrations, reducing load times and errors. Mentored junior engineers and established code quality standards through Storybook, code reviews, and Git best practices. Championed accessibility (WCAG) and internationalization with React Intl and semantic HTML, expanding global usability. Implemented advanced monitoring with analytics dashboards and logging tools to guide iterative improvements.

Frontend Engineer at Cleo

April 1, 2023 - September 2, 2025

Delivered features for Cleo’s AI-powered financial assistant with React, Redux, TypeScript, and Tailwind CSS, scaling to over 5 million global users. Built conversational UI components and dashboards, leveraging RESTful APIs and WebSockets for real-time financial interactions. Led refactoring of Cleo’s web app, improving performance by 25% through React hooks, code splitting, and Jest/React Testing Library. Partnered with PMs for rapid prototyping and A/B testing using feature flags and analytics tools to shorten product cycles. Contributed to internal design systems using Storybook and Styled Components, standardizing UI across teams.

Frontend Engineer at Chime

December 1, 2020 - September 2, 2025

Developed and shipped core banking features using Angular, TypeScript, and RxJS, contributing to growth from 6 million to over 10 million users. Implemented Angular components and services for onboarding and account-opening flows, boosting new user conversions. Optimized performance of high-traffic dashboards via lazy loading, Ahead-of-Time (AOT) compilation, and Angular state management (NgRx), reducing load times by 30%. Championed accessibility with ARIA standards and WCAG compliance, reducing UI-related support tickets. Collaborated with backend teams to integrate new transaction and notification features through RESTful APIs and GraphQL, ensuring real-time updates. Strengthened quality by partnering with QA on Karma, Jasmine, and Cypress test automation.

Frontend Engineer at Cleo

April 1, 2023 - September 18, 2025

Delivered features for Cleo's AI-powered financial assistant with React, Redux, TypeScript, and Tailwind CSS, scaling to 5M+ global users. Built conversational UI components and dashboards leveraging RESTful APIs and WebSockets for real-time financial interactions. Led refactoring with React hooks, code splitting, and improved performance. Collaborated with design and ML teams, championed accessibility (WCAG), and contributed to design systems and testing practices.

Frontend Engineer at Chime

December 1, 2020 - September 18, 2025

Developed and shipped core banking features using Angular, TypeScript, RxJS, and Redux, contributing to growth from 6M to 10M+ users. Implemented reusable UI components, improved performance, and collaborated with product and backend teams to deliver scalable features across web applications.