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I'm a full-stack developer with 5+ years of experience building React, Next.js, TypeScript, and PostgreSQL applications. I'm passionate about delivering products that scale and delight users. I built and deployed a multi-session AI chat application with streaming responses, authenticated data access, attachment-based context, and lightweight RAG. I'm seeking remote roles in AI applications, developer tools, or SaaS.…I'm a full-stack developer with 5+ years of experience building React, Next.js, TypeScript, and PostgreSQL applications. I'm passionate about delivering products that scale and delight users. I built and deployed a multi-session AI chat application with streaming responses, authenticated data access, attachment-based context, and lightweight RAG. I'm seeking remote roles in AI applications, developer tools, or SaaS.

GavinFelix Sun

Full Stack Developer, Web Developer, AI Engineer, +2

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I'm a full-stack developer with 5+ years of experience building React, Next.js, TypeScript, and PostgreSQL applications. I'm passionate about delivering products that scale and delight users. I built and deployed a multi-session AI chat application with streaming responses, authenticated data access, attachment-based context, and lightweight RAG. I'm seeking remote roles in AI applications, developer tools, or SaaS.…I'm a full-stack developer with 5+ years of experience building React, Next.js, TypeScript, and PostgreSQL applications. I'm passionate about delivering products that scale and delight users. I built and deployed a multi-session AI chat application with streaming responses, authenticated data access, attachment-based context, and lightweight RAG. I'm seeking remote roles in AI applications, developer tools, or SaaS.

Available to hire

I’m a full-stack developer with 5+ years of experience building React, Next.js, TypeScript, and PostgreSQL applications. I’m passionate about delivering products that scale and delight users.

I built and deployed a multi-session AI chat application with streaming responses, authenticated data access, attachment-based context, and lightweight RAG. I’m seeking remote roles in AI applications, developer tools, or SaaS.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Work Experience

Frontend Engineer at Hanweb Software Co., Ltd.

January 1, 2022 - December 31, 2025

Developed and maintained production web applications for 10,000+ users across provincial government and enterprise business systems. Primary frontend contributor collaborating with backend engineers, QA, and product stakeholders. Built reusable UI component libraries and data-driven page patterns, reducing repeated UI work by ~40%. Integrated frontend apps with REST APIs, authentication flows, error state management, and complex form/table interactions. Led the refactor of a 200k+ line legacy frontend project by extracting shared functions, hooks, and components, reducing code duplication from 38% to under 20%.