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Hen Heang

Backend Developer (Java & Spring Boot) | Java · Spring Boot · MyBatis · REST APIs · PostgreSQL · Oracle · Next.js

Seoul, South Korea | +82 86-7985-72 | henheang15@gmail.com | LinkedIn | github.com/Hen-Heang | henheang.site

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.

TECHNICAL SKILLS

Backend: Java, Spring Boot, MyBatis, Spring Security, REST APIs, Maven

Database: PostgreSQL, Oracle, MySQL, SQL Optimisation

Frontend: Next.js, React, TypeScript, JavaScript, jQuery, HTML5, CSS3, Tailwind CSS

Tools & DevOps: Git, GitHub, VS Code, Vercel, Railway, Claude Code

PROFESSIONAL EXPERIENCE

Full-Stack Developer — Bizplay

October 2025 – Present

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

Technologies: Java, MyBatis, Oracle, JavaScript, jQuery, HTML/CSS

Software Engineer — KOSIGN (Korea Software Innovation Global Network)

January 2024 – October 2025

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

Technologies: Java 8+, Spring Boot, Spring Security, PostgreSQL, MyBatis, Next.js, TypeScript

SELECTED PROJECTS

EDUCATION

Bachelor of Computer Science — Royal University of Phnom Penh

March 2020 – May 2024

Focused on software development, algorithms, and web technologies.

Full-Stack Development Certificate — Korea Software HRD Center

January 2023 – December 2023

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

Basic C++ Programming Certificate — ANT Technology Training Center

March 2021 – July 2021

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

LANGUAGES

Khmer — Native | English — Professional Working | Korean — Elementary (TOPIK I)