I build practical business products across React, Vue, Next.js, Node.js, Python, Java Spring Boot, PostgreSQL, and mobile web. My recent work focuses on AI agents, RAG knowledge assistants, workflow automation, admin systems, and data dashboards.
Frontend, backend, mobile, data, infrastructure, and AI tools used across real business systems.
A production-ready RAG customer-support assistant that answers only from a business's own documents, cites its sources, and hands off to a human when unsure — with a customer chat app and an admin console for documents, history, and answer testing.
Senior Full Stack Developer / AI Application Engineer
Hi, I'm ChingYao Wang, a senior full-stack developer and AI application engineer with more than 10 years of experience building web apps, mobile experiences, internal management tools, dashboards, CRM systems, and business automation products.
My main frontend stack is React, Vue, Next.js, TypeScript, and JavaScript. On the backend, I work with Node.js, PHP/Laravel, Python/FastAPI, Java Spring Boot, REST APIs, authentication, database design, service integrations, and deployment support.
Recently I have focused on AI product features including AI agent workflows, RAG-based knowledge assistants, prompt templates, internal AI tools, human review processes, and responsible AI training for engineering and business teams.
React, Vue, Next.js, Node.js, Python, Java Spring Boot, APIs, databases, and deployment support.
Admin dashboards, RBAC, workflows, reports, CRM, e-commerce, transaction tools, and operations pages.
AI agents, RAG assistants, prompt workflows, safe internal AI usage, and AI-assisted engineering.
Have a dashboard, business workflow, AI tool, mobile web product, or backend challenge? Send the details and let's talk.
I build maintainable full-stack products with clear data flows, practical UI, reliable APIs, and responsible AI workflows.