Open to opportunities

Wing Yin

@wingyin1

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Full-stack developer building scalable, intelligent AI-powered web applications.

Hong Kong

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What I'm looking for

I’m looking to build impactful, future-ready applications—combining scalable full-stack development with AI integration—to deliver seamless user experiences. I thrive collaborating with founders, product teams, and stakeholders to ship reliable solutions under tight deadlines.

I’m a full-stack developer with a strong passion for building scalable and intelligent digital solutions. I deliver end-to-end full-stack and AI-powered systems—handling architecture, requirements, deployment, and post-launch support—while focusing on seamless user experiences and future-ready technology.

Since 08/2021 (remote freelance), I’ve built responsive applications with React, Next.js, TypeScript, and Tailwind CSS for 15+ international clients, and integrated AI-driven features like chatbots, automation workflows, and real-time AI agents using OpenAI, LangChain, and custom API pipelines. In my earlier role at Sinocloud Group Limited (12/2017–08/2021), I helped scale full-stack web apps for 10K+ monthly users, improving page load times by 35% and achieving 90+ Lighthouse performance ratings—while also supporting CI/CD, accessibility, SEO, and reliable deployment.

Experience

Work history, roles, and key accomplishments

Current

Freelance Software Developer

Current

Upwork

Aug 2021 - Present (4 years 11 months)

Delivered full-stack and AI-powered solutions for 15+ international clients, combining scalable web development with modern AI integrations. Built responsive React/Next.js applications with OpenAI/LangChain-powered chatbots and automated workflows, and managed end-to-end delivery through deployment and post-launch support.

Full Stack Web Development React Next.js TypeScript OpenAI API Lang Chain Chatbot AI Agents Cloud Infrastructure

Software Developer

Sinocloud Group Limited

Dec 2017 - Aug 2021 (3 years 8 months)

Developed and maintained scalable full-stack web applications serving 10K+ monthly users, improving responsiveness and frontend performance. Built RESTful APIs and authentication with Node.js and PostgreSQL, and optimized performance, accessibility, and SEO (90+ Lighthouse scores) while supporting CI/CD and production monitoring.