Full-stack developer / Backend developer

KasapRattanavicharoj.

I build web applications and backend services with TypeScript, React, Next.js, and NestJS. I'm especially interested in the systems behind the interface: APIs, asynchronous work, and dependable deployments.

CurrentlySoftware Engineer

Land For Loan Co., Ltd.
Pathum Thani, Thailand

Selected projects

Products and systems I've built.

FaoRaan landing page showing its LINE customer chat assistant
Featured projectIn development

FaoRaan

Event-driven data & messaging platform

Built a multi-tenant platform designed to support shop messaging. It uses product information to shape responses, routes uncertain cases to a person, and processes messages and embeddings through background workers.

The backend uses NestJS, PostgreSQL/pgvector, Redis, and BullMQ, with retry and recovery paths for asynchronous jobs.

Not in production use yet. The linked landing page is a current preview and may change.

NestJS · PostgreSQL · Redis · BullMQ · RAG
View current landing page

Graduated Learning Progress Tracking System

A student progress tracker with a React frontend, backend APIs, and a database. Containerized and deployed with Docker.

React · Redux Toolkit · TypeScript · Docker

Code Reviewer

An AI-assisted pull request review service that processes reviews asynchronously, creates summaries, and handles retries and failures.

NestJS · Redis · BullMQ · LLM APIs

Experience

Where I've put this work into practice.

Software Engineer

Land For Loan Co., Ltd.

Developing backend services for e-signature workflows, including contract creation, signing, and status tracking. I also build REST APIs and chatbot integrations for administrator workflows.

Jul 2026 — Present

Developer Intern

Bluebik Vulcan Co., Ltd.

Worked on an oil well management system for data visualization and reporting, extending Angular UI components with RxJS and TypeScript.

Jun — Sep 2025

About

I'm a full-stack developer with a strong interest in backend engineering, cloud deployment, and building systems that stay reliable as they grow.

Based in Pathum Thani, Thailand. I graduated in Software Engineering from Burapha University in 2026 with first-class honours.

Working with

Backend
NestJS, Spring Boot, REST APIs, event-driven systems
Frontend
React, Next.js, Angular, TypeScript
Data & infrastructure
PostgreSQL, Redis, Docker, AWS, CI/CD
AI integration
LLM APIs, RAG, function calling