Scalable systems
and production
AI — built to last.

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.

Start a Project How I Work Download Resume

Years Experience

10K+

Concurrent Users Served

99.9%

Uptime Delivered

Every great developerdeveloper begins with an even better story.story.

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.

Stack.ts

const Engineer = await Profile.create({

role: "Senior Full Stack AI Engineer",

stack: [

"Next.js", "TypeScript", "Node.js",

"LangChain", "FastAPI"

experience: 8 // years

});

Compiling...

System Monitor

Online

API Gateway

24ms

Database

Connected

Network Traffic1.2 GB/s

terminal — zsh

➜ ~ 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

2022 – 2024

Senior Full Stack AI Engineer

Human City

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.

2020 – 2021

Software Developer

Kaleidico

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.

2017 – 2018

Full Stack Developer

Infuse

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.

2012 – 2016

BSc Computer Science

University of Hong Kong

Foundation in algorithms, systems, and software engineering.

Your vision. My code.
Real results.Real results.

A streamlined process designed to take your project from concept to reality efficiently.

Discovery

We align on requirements, scope, and success criteria — so the solution fits your goals.

Architecture

Technical design: APIs, data models, infra, and rollout plan. No surprises at launch.

Build

Clean, testable code with CI/CD. Regular check-ins and incremental delivery.

Ship & Operate

Deploy to production with monitoring and runbooks. Iterate based on real usage.

FULL-STACK • AI • RAG • CLOUD • SCALE •

Interfaces That Scale

FRONTEND

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.

React / Next.js

TypeScript

Tailwind CSS

Angular / HTML5 & CSS3

Start Project

APIs & System Design

BACKEND

Low-latency REST and GraphQL APIs with authentication and authorization. FastAPI and Node.js with streaming, batching, and policy-based routing for production workloads.

Node.js / NestJS / Express

FastAPI / Python

GraphQL / REST / WebSockets

Socket.io

Start Project

RAG & Production ML

AI & LLM

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.

OpenAI API / LangChain / LlamaIndex

Pinecone / pgvector

RAG Pipelines

PyTorch / TensorFlow

Start Project

Ship Fast, Run Reliable

CLOUD & DEVOPS

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.

Docker / Kubernetes

AWS / Azure

Jenkins / GitHub Actions

CI/CD Pipelines

Start Project

Reliable & Compliant

DATA & SECURITY

PostgreSQL, MySQL, MongoDB, Redis, Firebase, and Supabase. OAuth2, JWT, HIPAA-aware design, and secure payment flows with Stripe and PayPal.

PostgreSQL / MySQL / MongoDB

Redis / Firebase / Supabase

OAuth2 / JWT

Stripe / PayPal

Start Project

CODE.CODE.

CREATE.

CONQUER.CONQUER.

Build systems that scale. Ship AI that works in production. Ready when you are.

Let's build something
amazing together.

Ready to transform your digital presence? I'm currently available for new projects and collaborations.

Available for freelance work

Response time: < 24 hours

Download my resume

Scalable systemsand production AI — built to last.

Every great developerdeveloper begins with an even better story.story.

Senior Full Stack AI Engineer

Software Developer

Full Stack Developer

BSc Computer Science

Your vision. My code.Real results.Real results.

Discovery

Architecture

Build

Ship & Operate

FRONTEND

BACKEND

AI & LLM

CLOUD & DEVOPS

DATA & SECURITY

CODE.CODE.

CREATE.

CONQUER.CONQUER.

Let's build somethingamazing together.

Every great developerdeveloper begins with an even better story.story.

Senior Full Stack AI Engineer

Software Developer

Full Stack Developer

BSc Computer Science

FRONTEND

BACKEND

AI & LLM

CLOUD & DEVOPS

DATA & SECURITY

CODE.CODE.

CREATE.

CONQUER.CONQUER.

Let's build somethingamazing together.

Scalable systems
and production
AI — built to last.

Your vision. My code.
Real results.Real results.

Let's build something
amazing together.

Let's build something
amazing together.