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I am a Senior Software Engineer with over 10 years of experience specializing in scalable web application development leveraging React, TypeScript, React Native, and Node.js. I have delivered large-scale features for platforms like Meta AI and Twitter Spaces, impacting hundreds of millions of users. I excel at building intuitive interfaces, robust services, and collaborating cross-functionally to deliver measurable product outcomes. I thrive in performance-critical, user-centered environments spanning AI, real-time systems, and productivity tools. My deep expertise includes front-end and back-end development, AI & ML integration, testing and quality assurance, cloud deployment, and accessibility compliance.…I am a Senior Software Engineer with over 10 years of experience specializing in scalable web application development leveraging React, TypeScript, React Native, and Node.js. I have delivered large-scale features for platforms like Meta AI and Twitter Spaces, impacting hundreds of millions of users. I excel at building intuitive interfaces, robust services, and collaborating cross-functionally to deliver measurable product outcomes. I thrive in performance-critical, user-centered environments spanning AI, real-time systems, and productivity tools. My deep expertise includes front-end and back-end development, AI & ML integration, testing and quality assurance, cloud deployment, and accessibility compliance.

Yifei Chen

Web Developer, Programmer, Developer, +2

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I am a Senior Software Engineer with over 10 years of experience specializing in scalable web application development leveraging React, TypeScript, React Native, and Node.js. I have delivered large-scale features for platforms like Meta AI and Twitter Spaces, impacting hundreds of millions of users. I excel at building intuitive interfaces, robust services, and collaborating cross-functionally to deliver measurable product outcomes. I thrive in performance-critical, user-centered environments spanning AI, real-time systems, and productivity tools. My deep expertise includes front-end and back-end development, AI & ML integration, testing and quality assurance, cloud deployment, and accessibility compliance.…I am a Senior Software Engineer with over 10 years of experience specializing in scalable web application development leveraging React, TypeScript, React Native, and Node.js. I have delivered large-scale features for platforms like Meta AI and Twitter Spaces, impacting hundreds of millions of users. I excel at building intuitive interfaces, robust services, and collaborating cross-functionally to deliver measurable product outcomes. I thrive in performance-critical, user-centered environments spanning AI, real-time systems, and productivity tools. My deep expertise includes front-end and back-end development, AI & ML integration, testing and quality assurance, cloud deployment, and accessibility compliance.

Available to hire

I am a Senior Software Engineer with over 10 years of experience specializing in scalable web application development leveraging React, TypeScript, React Native, and Node.js. I have delivered large-scale features for platforms like Meta AI and Twitter Spaces, impacting hundreds of millions of users. I excel at building intuitive interfaces, robust services, and collaborating cross-functionally to deliver measurable product outcomes.

I thrive in performance-critical, user-centered environments spanning AI, real-time systems, and productivity tools. My deep expertise includes front-end and back-end development, AI & ML integration, testing and quality assurance, cloud deployment, and accessibility compliance.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Chinese

Advanced

Work Experience

Senior Software Engineer at Meta

January 1, 2024 - Present

Led frontend development of the Meta AI App using React and TypeScript, delivering real-time multimodal AI interactions to over 400 million users. Developed streaming chat interfaces with photo and audio support, achieving high performance scores. Implemented image editing features powered by Llama 3.2, boosting user engagement. Connected backend Node.js services to AI model APIs with batch routing, reducing latency. Designed UI for voice-to-text responses and set up comprehensive testing harnesses maintaining strong test coverage. Collaborated with AI infrastructure teams to deploy services via Kubernetes ensuring high uptime and compliance with GDPR/CCPA through PII redaction in images. Provided cross-toolchain product feedback and participated in company-wide AI summits presenting new interaction flows.

Senior Software Engineer at Twitter (now X)

December 31, 2023 - July 10, 2025

Optimized Twitter Spaces web experience using React and associated technologies enabling live audio room participation with reduced latency. Developed feature-rich scheduling and reminder UIs with calendar integrations and promotion capabilities. Implemented monetized Ticketed Spaces with secure payment and authentication flows contributing to multi-million dollar revenues. Enhanced SEO and load times through lazy loading and SSR. Embedded live metrics and event replay dashboards. Partnered with mobile teams for platform parity and developed accessibility features compliant with WCAG 2.1 AA standards.

Software Engineer at Robin Powered

January 31, 2016 - July 10, 2025

Developed web-based desk and room booking platforms with real-time state management. Integrated calendar APIs for availability syncing improving booking accuracy. Built interactive analytics dashboards giving office usage insights. Authored end-to-end tests and achieved good test coverage. Implemented concurrency control to prevent double-bookings. Led usability testing sessions to iterate UI improvements and conducted A/B tests.

Full Stack Developer at Farseer, Inc

October 31, 2014 - July 10, 2025

Built web and mobile food discovery platform with image upload and cropping features. Implemented secure REST APIs with OAuth2 and role-based access control. Developed moderation tools and deployment scripts using AWS infrastructure ensuring SSL and backups.

Senior Software Engineer at Meta

January 1, 2024 - Present

Led the frontend development for the Meta AI App integrating Llama 3.2, delivering real-time multimodal AI interactions to over 400 million users. Developed a streaming chat interface with intelligent message rendering and multimedia support, achieving a 98% Lighthouse performance score. Introduced image editing capabilities using WebGL and Canvas APIs powered by natural language commands, increasing engagement by 34%. Connected Node.js backend services to Meta’s AI model APIs with optimized batch routing, reducing latency by 22%. Designed fallback and optimistic UI workflows for voice-to-text responses. Maintained 91% test coverage and collaborated with AI infrastructure teams to ensure 99.98% uptime. Implemented PII redaction features complying with GDPR/CCPA. Provided product feedback and debugging for internal toolchains and presented new interaction flows at a company-wide AI summit.

Senior Software Engineer at Twitter (now X)

December 31, 2023 - July 30, 2025

Optimized Twitter Spaces web experience using React, TypeScript, and Next.js to enable browser-based live audio participation. Integrated full-stack audio streaming with WebRTC and backend services, reducing join latency to 150ms across millions of active sessions. Developed scheduling and reminder UI with calendar integration and monetized Ticketed Spaces using Stripe Connect, contributing over $3M in revenue. Implemented lazy loading and server-side rendering for improved SEO and performance. Created live metrics dashboards and embedded analytics using internal logging and React-based visualization tools. Worked cross-platform with mobile engineers to ensure feature parity and WCAG 2.1 AA accessibility compliance for closed captioning and ARIA standards.

Software Engineer at Robin Powered

January 31, 2016 - July 30, 2025

Developed a web-based desk and room booking platform with React, Redux, and real-time state updates. Integrated multiple calendar APIs for accurate booking synchronization, improving accuracy by 98%. Built interactive analytics dashboards with D3.js and Chart.js. Authored end-to-end tests with Cypress and executed browser compatibility tests. Implemented concurrency controls to prevent double bookings and led usability sessions with product and UX teams, iteratively improving UI through A/B testing.

Full Stack Developer at Farseer, Inc

October 31, 2014 - July 30, 2025

Built a web and mobile food discovery platform using Node.js, MongoDB, and Bootstrap. Enabled image uploads with cropping and filtering, and added location tagging features. Implemented REST APIs secured by JWT and OAuth2 with role-based access control. Created moderation tools with AngularJS and deployed the app on AWS with SSL and daily backups.

Senior Software Engineer at Meta

January 1, 2024 - Present

Spearheaded the frontend development of the Meta AI App integrating Llama 3.2 using React and TypeScript, delivering real-time multimodal AI interactions to over 400 million users. Engineered a streaming chat interface with intelligent message rendering and photo/audio support achieving a 98% Lighthouse performance score. Introduced image editing features using WebGL and Canvas APIs, increasing engagement on visual tasks by 34%. Connected Node.js backend services to Meta's model APIs with batch routing and retry strategies reducing latency by 22%. Designed fallback workflows and optimistic UI for voice-to-text responses. Maintained 91% unit test coverage and caught 89% of regressions pre-production. Collaborated with AI infrastructure teams to deploy services via Kubernetes ensuring 99.98% uptime. Applied in-browser Vision Transformer filters for PII redaction compliant with GDPR/CCPA. Provided product feedback and debugging support across Horizon SDK, PyTorch inference API, and Meta D

Senior Software Engineer at Twitter (now X)

December 1, 2023 - September 1, 2025

Optimized Twitter Spaces web experience using React, TypeScript, Next.js, and Redux Toolkit, enabling browser-based joining and speaking in live audio rooms. Integrated full-stack audio event streaming with WebRTC, Node.js (Socket.IO), and Redis Pub/Sub, reducing join latency to 150 ms across over 1 million active sessions. Orchestrated a feature-rich scheduling and reminder UI with React Calendar, Luxon, and integrated iCal export with tweet promotion. Deployed monetized Ticketed Spaces via Stripe Connect API, building secure payment/auth flows in Node.js/TypeScript backend to contribute over $3 million in revenue. Executed lazy loading and SSR for SEO optimization using Next.js dynamic imports and Headless UI, reducing initial paint time by ~65%. Embedded live metrics with Datadog RUM and internal Kafka logging streams, building event replay dashboards using React and Chart.js. Partnered with Android/iOS engineers for platform parity and unified state handling using protobuf schemas

Software Engineer at Robin Powered

January 1, 2016 - September 1, 2025

Developed the Web-Based Desk & Room Booking Platform using React, Redux, and SVG.js with real-time state management via Socket.IO enabling users to book desks visually in 3 seconds. Built room availability sync with Google Calendar API, Microsoft Graph API, and normalized recurring events in Node.js with PostgreSQL improving booking accuracy by 98%. Developed interactive analytics dashboard using D3.js, Chart.js, and React Hooks giving workspace managers actionable office usage insights. Authored Cypress end-to-end tests for all booking flows, set up browser matrix testing on BrowserStack reaching 85% coverage. Prevented double-bookings with atomic update locks and optimistic concurrency control using Node.js and PostgreSQL advisory locks. Led usability sessions with product and UX, iterating UI via React HotLoader and conducting A/B tests with LaunchDarkly.

Full Stack Developer at Farseer, Inc

October 1, 2014 - September 1, 2025

Assembled the Web & Mobile Food Discovery Platform using Node.js (Express), MongoDB, Bootstrap, and jQuery, launching on both desktop and mobile browsers. Enabled image upload with cropping and filter options using FilePond, Cloudinary API, and added location tagging via HTML5 Geolocation API. Established secured REST APIs with JWT-based OAuth 2, role-based access control middleware, and password recovery flows via SendGrid. Devised moderation tools with AngularJS and REST hooks supporting content reports and usage dashboards. Deployed app to AWS EC2, configured Nginx as reverse proxy, and setup daily S3 backups with SSL using Let's Encrypt.