I'm Lin Jing An — senior full-stack and AI engineer. I build high-availability web apps, RAG systems with LLMs, and low-latency APIs. React, Next.js, Node.js, Python, and cloud-native infra.
Build systems that scale. Ship AI that works in production. Ready when you are.
I've spent 8+ years shipping full-stack and AI systems that scale: high-availability web apps, RAG pipelines with OpenAI and LangChain, and low-latency APIs with FastAPI and Node.js. I care about clean architecture, secure APIs, and deployable, measurable outcomes.
I design and deploy ML in production (PyTorch, TensorFlow), run evaluations and guardrails, and use Docker and Kubernetes with CI/CD so releases are fast and reliable. I've led teams and mentored developers while keeping quality and on-time delivery front and center.
Based in Hong Kong, I work in English and Mandarin. If you need a senior engineer for full-stack, AI/LLM, or cloud infrastructure — let's talk.
const Engineer = await Profile.create({
role: "Senior Full Stack AI Engineer",
stack: [
"Next.js", "TypeScript", "Node.js",
"LangChain", "FastAPI"
],
experience: 8 // years
});
➜ ~ git push origin master
Enumerating objects: 15, done.
Counting objects: 100% (15/15), done.
Writing objects: 100% (9/9), 2.41 KiB, done.
🚀 Deployed to Production
Full-stack apps at scale (10K+ users, 99.9% uptime). Integrated OpenAI, LangChain, and LLM APIs; deployed ML with PyTorch and TensorFlow. CI/CD, Docker, Kubernetes, and mentoring.
Responsive web apps with React; AI-driven features with OpenAI and LLM frameworks. RESTful APIs in Node.js with PostgreSQL and MongoDB; unit and integration testing.
RESTful APIs with PostgreSQL and MongoDB; full-stack React, Next.js, Node.js for 20K+ users. OAuth2 and JWT auth; Docker, AWS, and CI/CD for production deployments.
Foundation in algorithms, systems, and software engineering.
A streamlined process designed to take your project from concept to reality efficiently.
We align on requirements, scope, and success criteria — so the solution fits your goals.
Technical design: APIs, data models, infra, and rollout plan. No surprises at launch.
Clean, testable code with CI/CD. Regular check-ins and incremental delivery.
Deploy to production with monitoring and runbooks. Iterate based on real usage.
High-performance UIs with React and Next.js. TypeScript, Tailwind CSS, and responsive design for apps that serve tens of thousands of users with high availability.
Low-latency REST and GraphQL APIs with authentication and authorization. FastAPI and Node.js with streaming, batching, and policy-based routing for production workloads.
RAG systems with OpenAI, LangChain, and LlamaIndex. Embeddings in pgvector or Pinecone; guardrails and offline/online evaluations. Deploying and serving models in PyTorch and TensorFlow.
CI/CD pipelines, automated testing, and containerized deployments. Docker and Kubernetes on AWS and Azure. Database tuning, Redis caching, and scalable architecture for 99.9% uptime.
PostgreSQL, MySQL, MongoDB, Redis, Firebase, and Supabase. OAuth2, JWT, HIPAA-aware design, and secure payment flows with Stripe and PayPal.
Ready to transform your digital presence? I'm currently available for new projects and collaborations.