Hen Heang

Full-Stack Software Engineer

Java · Spring Boot · MyBatis · JavaScript · Next.js · TypeScript

Seoul, South Korea

+82 86-7985-72

henheang15@gmail.com

GitHub

Portfolio

About Me

Full-Stack Software Engineer with 2+ years of experience building enterprise web applications in Korea and Cambodia. Specialise in Java/Spring Boot backends paired with modern frontends (Next.js, TypeScript). Proven track record in FinTech and B2B platforms — from database design and REST API implementation to frontend delivery. Comfortable working in Korean-language enterprise teams and delivering clean, maintainable code.

Professional Experience

Webcash Inc.

October 2025 — Present

Full-Stack Developer• Seoul, South Korea

Develop frontend pages with HTML/CSS and JavaScript (jQuery) for government-facing financial systems
Build backend services and SQL queries with Java, MyBatis, and Oracle database
Maintain and improve stability of enterprise web applications in a Korean enterprise environment
Collaborate in cross-functional teams following Korean enterprise development patterns

JavaMyBatisOracleJavaScriptjQueryHTML/CSS

KOSIGN (Korea Software Innovation Global Network)

January 2024 — October 2025

Software Engineer• Phnom Penh, Cambodia

Built WeBill365 — a large-scale B2B billing platform integrated with Vietnamese banking systems
Designed PostgreSQL schemas and optimised query performance for high-volume transactions
Implemented Spring Security with JWT authentication for enterprise-grade security
Developed REST APIs with Spring Boot and MyBatis; integrated Zalo, SMS, and Telegram delivery
Collaborated daily with Korean development teams on architecture and code reviews

Java 8+Spring BootSpring SecurityPostgreSQLMyBatisNext.jsTypeScript

Korea Software HRD Center

July 2023 — April 2024

Android Developer (Training)• Cambodia

Completed intensive full-stack and mobile development bootcamp
Built Android applications using Java/Kotlin and Android SDK
Gained foundation in Korean software development practices and enterprise patterns

AndroidJavaKotlin

Selected Projects

KoriAI

CODE LIVE

AI-powered Korean language learning platform with real-time conversational tutor, grammar analysis, and spaced-repetition vocabulary engine.

Next.jsTypeScriptOpenAI APITailwind CSSVercel

WeBill365 – FinTech Billing Platform

CODE LIVE

Large-scale B2B billing and payment collection system integrated with Vietnamese banking. Handles automated QR generation, multi-channel notifications, and real-time reconciliation.

Spring BootJava 8PostgreSQLRedisNext.jsZalo API

Money Flow

CODE LIVE

Personal finance orchestrator with encrypted authentication, dynamic dashboard, and ACID-compliant transaction engine.

Next.jsTypeScriptAuth.jsPostgreSQLVercel

Technical Expertise

Backend85%

JavaSpring BootMyBatisSpring SecurityREST APIsMaven

Frontend80%

JavaScriptjQueryHTML5CSS3TypeScriptReactNext.jsTailwind CSS

Database80%

PostgreSQLOracleMySQLSQL Optimisation

Tools & DevOps80%

GitGitHubIntelliJ IDEAWebStormVS CodeVercelRailway

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

100%

EnglishProfessional Working

70%

KoreanElementary (TOPIK I)

30%