Scalable systems
and production
AI — built to last.

I'm Lin Jing An — senior full-stack engineer with 9+ years shipping end-to-end products. React, Next.js, and TypeScript UIs; Node.js, NestJS, Express.js, and Java Spring Boot microservices; production AI with OpenAI, LangChain, LlamaIndex, RAG, and vector databases 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 engineer with 9+ years of experience delivering end-to-end products across frontend, backend, AI, and cloud — responsive React, Next.js, and TypeScript interfaces; enterprise Java and Spring Boot microservices; and scalable Node.js, NestJS, and Express.js APIs.

I ship production AI with RAG over OpenAI, LangChain, LlamaIndex, Pinecone, and pgvector; secure REST and GraphQL APIs with OAuth2, JWT, and RBAC; and CI/CD with Docker, Kubernetes, Jenkins, and GitHub Actions on AWS and Azure — mentoring and delivering across teams.

Based in Singapore and available for senior work across full-stack, Java and Spring Boot, or AI/LLM systems. If that's what you need — let's talk.

Stack.ts

const Engineer = await Profile.create({

role: "Senior Software Engineer",

stack: [

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

"LangChain", "Spring Boot"

experience: 9 // 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

2024 – 2025

Senior Software Engineer

Adventus

Responsive React and Next.js applications in TypeScript; Node.js and NestJS services with secure REST and GraphQL APIs, PostgreSQL, and Redis; Java and Spring Boot microservices with Spring MVC, JPA, and Hibernate. RAG search with OpenAI, LangChain, LlamaIndex, Pinecone, and pgvector cut search time 40%; OAuth2, JWT, and automated tests cut integration defects 50%; Docker on AWS and Kubernetes with Jenkins and GitHub Actions cut deployment time 35%.

2022 – 2024

Senior Full Stack Developer

Tech Grid Asia

React and Next.js applications for 10K+ concurrent users at 99.9% uptime; reusable TypeScript components for authentication, routing, and validation cut development time 30%. Node.js and NestJS services with REST and GraphQL over PostgreSQL and MongoDB; Java microservices with Spring Boot, JPA, Hibernate, and Redis raised throughput 35% and cut latency 30%. OpenAI and LangChain search cut manual work 30%; Docker and Kubernetes CI/CD cut release cycles 80%, with team mentoring.

2020 – 2021

Full Stack Web Developer

TeamDev Ltd.

Reusable React, Next.js, and TypeScript components for responsive layouts, cutting duplicated UI code 35%. Node.js, NestJS, and Express.js APIs with PostgreSQL and MongoDB; Java and Spring Boot services with strong typing, persistence, and integration tests cut production defects 30%. Delivery with design, QA, and product cut release delays 25%.

2018 – 2020

Full Stack Application Developer

FiveStones

Responsive React and Next.js applications with reusable components and APIs for 20K+ active users; Node.js and Express.js REST APIs over PostgreSQL and MongoDB. Java and Spring Boot services cut transaction failures 25%; OAuth2 and JWT secured user-facing transactions; Docker and CI/CD on AWS cut deployment failures 30%.

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, React Hooks, and reusable component architecture with mobile-first layouts for apps serving tens of thousands of users.

React / Next.js / React Hooks

TypeScript / JavaScript (ES6+)

Component Architecture / Angular

Tailwind CSS / HTML5 & CSS3

Start Project

APIs & System Design

BACKEND

Enterprise microservices in Java and Spring Boot with JPA and Hibernate. Low-latency REST and GraphQL APIs on Node.js, NestJS, and Express.js for business-critical workloads.

Java / Spring Boot / Spring MVC

Spring Data JPA / Hibernate

Node.js / NestJS / Express.js

REST / GraphQL / WebSockets

Start Project

RAG & LLM Integration

AI & LLM

RAG search automation with OpenAI, LangChain, and LlamaIndex. Embeddings in pgvector or Pinecone, with LLM integrations wired into backend services to cut search time by 40%.

OpenAI API / LangChain / LlamaIndex

Pinecone / pgvector

RAG Pipelines

LLM Integrations / Vector Search

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 & Secure

DATA & SECURITY

PostgreSQL, MySQL, MongoDB, Redis, Firebase, and Supabase. OAuth2, JWT, and RBAC for API security, backed by unit and integration testing and performance optimization.

PostgreSQL / MySQL / MongoDB

Redis / Firebase / Supabase

OAuth2 / JWT / RBAC

Unit & Integration Testing

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

Scalable systemsand production AI — built to last.