Hen Heang

Backend Developer (Java & Spring Boot)

Java · Spring Boot · MyBatis · REST APIs · PostgreSQL · Oracle · Next.js

Seoul, South Korea+82 86-7985-72henheang15@gmail.com LinkedIn GitHub Portfolio

Professional Summary

Backend Developer with 2+ years of experience building REST APIs and enterprise applications with Java, Spring Boot, MyBatis, PostgreSQL, and Oracle. Currently developing government-facing financial systems in a Korean enterprise environment; previously delivered secured B2B billing and commerce features from schema design through API implementation. I extend backend work to Next.js and TypeScript when a product needs a frontend.

Professional Experience

Bizplay

October 2025 – Present

Full-Stack Developer· Seoul, South Korea

Build Java and MyBatis services backed by Oracle for government-facing financial systems
Develop and maintain enterprise web interfaces with JavaScript and jQuery
Improve production stability with a cross-functional Korean team

JavaMyBatisOracleJavaScriptjQueryHTML/CSS

KOSIGN (Korea Software Innovation Global Network)

January 2024 – October 2025

Software Engineer· Phnom Penh, Cambodia

Built B2B billing and payment features with Spring Boot and MyBatis
Designed PostgreSQL schemas and optimized high-volume SQL queries
Implemented Spring Security and JWT authentication for enterprise APIs

Java 8+Spring BootSpring SecurityPostgreSQLMyBatisNext.jsTypeScript

Selected Projects

H-Phsar

Code

Spring Boot marketplace API for distributor and retailer catalogs, carts, controlled order transitions, OTP verification, and real-time notifications.

Spring Boot 3Java 17MyBatisPostgreSQLWebSocket

Hengo

Code Live

AI-powered workplace Korean and growth platform on Next.js, Supabase Auth/Postgres with RLS, and JWT-verified AI routes.

Next.js 16TypeScriptSupabaseVercel AI SDKOpenAI

We Commerce

Code

Multi-vendor marketplace with a Spring Boot API and responsive Next.js storefront for catalog, cart, checkout, and order tracking.

Spring Boot 3Java 21PostgreSQLNext.jsTanStack Query

Money Flow

Code Live

Personal finance PWA on Supabase with RLS, budgets, savings goals, scheduled activity, AI-assisted review, and automated backup.

Next.jsTypeScriptSupabaseGoogle GeminiWeb Push

Technical Skills

Backend

JavaSpring BootMyBatisSpring SecurityREST APIsMaven

Database

PostgreSQLOracleMySQLSQL Optimisation

Frontend

Next.jsReactTypeScriptJavaScriptjQueryHTML5CSS3Tailwind CSS

Tools & DevOps

GitGitHubIntelliJ IDEAWebStormVS CodeVercelRailwayClaude Code

Education

March 2020 – May 2024

Royal University of Phnom Penh

Bachelor of Computer Science

Focused on software development, algorithms, and web technologies.

January 2023 – December 2023

Korea Software HRD Center

Full-Stack Development Certificate

Intensive bootcamp covering HTML, CSS, JavaScript, React, Java, and databases.

March 2021 – July 2021

ANT Technology Training Center

Basic C++ Programming Certificate

Introduction to programming concepts and problem solving with C++.

Languages

KhmerNative

EnglishProfessional Working

KoreanElementary (TOPIK I)