Scalable systems
and production
AI — built to last.

I'm Lin Jing An — senior full-stack and AI engineer with 8+ years building scalable web apps and production LLM systems. RAG with OpenAI, LangChain, and LlamaIndex; PyTorch and TensorFlow; FastAPI, Node.js, React, Next.js, and cloud deployments on AWS and Azure.

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'm a senior full-stack and AI engineer with 8+ years of experience building scalable web applications and production LLM systems — RAG pipelines with OpenAI, LangChain, and LlamaIndex; low-latency inference with FastAPI and Node.js; and models deployed with PyTorch and TensorFlow.

I ship with React, Next.js, and Node.js; design secure APIs; and run CI/CD with Docker and Kubernetes on AWS and Azure. I've led teams, mentored developers, and delivered production-ready AI solutions on schedule.

Based in Singapore, 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 Software 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 – 2025

Senior Full Stack Engineer

Bearplus

Full-stack applications with React, Next.js, and Node.js (10K+ concurrent users, 99.9% uptime). OpenAI, LangChain, and LLM integrations; PyTorch and TensorFlow inference; secure REST and GraphQL APIs; CI/CD with Docker and Kubernetes; Redis caching and database tuning; mentoring and cross-functional delivery.

2020 – 2021

Software Developer

Smitiv

Responsive web applications with HTML, CSS, JavaScript, and React. AI-driven features with OpenAI and LLM frameworks. RESTful APIs in Node.js with PostgreSQL and MongoDB; unit and integration tests and code reviews with design, QA, and product.

2018 – 2020

Full Stack Developer

PROTEUS-DT

RESTful APIs with PostgreSQL and MongoDB; React, Next.js, and Node.js for 20K+ active users. AI with OpenAI, LangChain, and LLM frameworks; OAuth2 and JWT; Docker, AWS, and CI/CD alongside product and design.

2014 – 2018

Bachelor's degree / Computer Science

National University of Singapore (NUS)

Undergraduate computer science studies (05/2014 – 09/2018), Singapore.

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 / HIPAA

Stripe / PayPal

Start Project

Selected work

Ship productsproducts that scale.scale.

A cross-section of systems I've architected or delivered: LLM pipelines, resilient APIs, cloud-native releases, and product surfaces tuned for growth and reliability.

Same scroll and hover motion as the experience section—laid out in rows for quick scanning.

#01

Igloo — SaaS Marketing Platform

Worked on the marketing site, handled the layout, animations, and component structure. Clean, fast, and built to convert.

Next.jsReactTypeScriptTailwind CSSFramer Motion

Live demo

#02

Hatom — DeFi Protocol Platform

Frontend work on a DeFi platform. Lots of real-time data, wallet integration, and making complex information actually readable.

Next.jsReactTypeScriptWeb3Tailwind CSS

Live demo

#03

GoCrazyAI — AI Web Application

Built the frontend for an AI web app. Auth flow, dynamic UI, and keeping things snappy for users.

Next.jsReactTypeScriptNode.jsTailwind CSS

Live demo

#04

Paymash — Point of Sale and Payment Platform

POS and payments platform. Product management, transaction flows, and a dashboard that actually makes sense to use.

ReactTypeScriptNode.jsStripeTailwind CSS

Live demo

#05

Prevounce — Remote Therapeutic Monitoring Platform

Healthcare SaaS with provider and patient dashboards, role-based access, and careful handling of sensitive data.

ReactTypeScriptNode.jsPostgreSQLREST API

Live demo

#06

Gingr — Pet Care Business Management Platform

Booking, scheduling, client profiles, and payments for pet care businesses. Multi-role dashboards and a smooth customer-facing flow.

ReactTypeScriptNode.jsPostgreSQLStripe

Live demo

#07

Knockaround — Custom Sunglasses E-Commerce

E-commerce build with a product customizer, cart, checkout, and Stripe. High traffic so performance mattered a lot.

ShopifyReactNext.jsTypeScriptStripeTailwind CSS

Live demo

#08

Houfy — Direct Vacation Rental Platform

Rental marketplace where hosts list properties and guests book directly. Listings, booking flow, messaging, and payments.

ReactNext.jsTypeScriptNode.jsPostgreSQL

Live demo

#09

TheOceann — AI-Powered Maritime Logistics Platform

Maritime freight platform with vessel tracking, cargo management, and AI-driven matching. Heavy on data visualization.

ReactTypeScriptNode.jsREST APITailwind CSS

Live demo

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

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

Based in Singapore, I work in English and Mandarin. If you need a senior engineer for full-stack, AI/LLM, or cloud infrastructure — let's talk.

Scalable systemsand production AI — built to last.