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Hen Heang

About

Hen Heang — Backend / AX Software Engineer

Hen Heang

I'm Hen Heang, a Cambodian software engineer currently working in South Korea. My primary foundation is backend engineering with Java, Spring Boot, MyBatis, PostgreSQL, and Oracle, supported by frontend delivery with Next.js and TypeScript.

My professional work focuses on enterprise systems, API development, and SQL-driven business logic. In personal projects, I have also integrated practical AI features and used Claude Code and Codex as development assistants.

I am growing toward Backend / AX Software Engineer through learning and practice in Agent Harness design, MCP, evaluations, DevOps, and system architecture. I care about maintainable systems, explicit decisions, verification, and software that solves real problems.

Location
Seoul, South Korea
Experience
2+ years
Email
henheang15@gmail.com
Languages
  • Khmer
  • English
  • Korean
Availability
Open to opportunities

Career Timeline

Experience, education & milestones

One chronological journey through schools, training programs, companies, awards, and certifications—from Cambodia to Korea. Credentials appear under the institution that awarded them.

  1. 2020–2024

    Bachelor of Computer Science

    Royal University of Phnom Penh · Phnom Penh, Cambodia

    Completed a Bachelor's degree focused on software development, algorithms, and web technologies.

    • Bachelor of Science in Computer Science and Engineering from Royal University of Phnom Penh
      Bachelor of Science in Computer Science and Engineeringgraduation

  2. 2021

    Basic C++ Programming

    ANT Technology Training Center

    Introduction to programming concepts using C++.

  3. 2021

    Word, Excel, PowerPoint & Internet Certificate

    Addbook Computer Centre

    Completed Addbook Computer Centre's practical computer course covering Microsoft Word, Excel, PowerPoint, and internet fundamentals from September to December 2021.

    Word, Excel, PowerPoint & Internet Certificate from Addbook Computer Centre

  4. 2023

    Full-Stack Development Bootcamp

    Korea Software HRD Center

    Intensive training in full-stack development, covering HTML, CSS, JavaScript, React, Java, and database management.

    • Korea Software HRD Center Graduation from Korea Software HRD Center
      Korea Software HRD Center Graduationgraduation
    • Top Team Award & Best Live Project Demonstration Award from Korea Software HRD Center
      Top Team Award & Best Live Project Demonstration Awardaward
    • KSHRD Basic Course Certificate from Korea Software HRD Center
      KSHRD Basic Course Certificatecertificate
    • KSHRD Advanced Course Certificate from Korea Software HRD Center
      KSHRD Advanced Course Certificatecertificate

  5. 2023-2024

    Mobile Application Development Training

    Korea Software HRD Center

    Hands-on training in Android application development using Java, Kotlin, and Android Studio.

  6. January 2024 — October 2025

    Software Engineer

    KOSIGN [Korea Software Innovation Global Network] · Phnom Penh, Cambodia

    Developed B2B financial platforms including billing systems and e-commerce solutions. Built end-to-end features from database design to API implementation.

    • Built a B2B billing and payment platform for enterprise clients
    • Designed PostgreSQL database schemas and optimized query performance
    • Implemented Spring Security with JWT authentication
    • Developed REST APIs with Spring Boot and MyBatis
    • Collaborated with Korean development teams on enterprise projects
    • Java 8+
    • Spring Boot
    • Spring Security
    • PostgreSQL
    • MyBatis
    • Next.js
    • TypeScript
    • Mindfulness for Wellbeing — Certificate of Completion from KOSIGN [Korea Software Innovation Global Network]
      Mindfulness for Wellbeing — Certificate of Completioncertificate

  7. October 2025 — Present

    Backend Developer (Java & Spring Boot)

    Bizplay · Seoul, South Korea

    Building enterprise financial web applications for government agencies and corporate clients. Developing both frontend interfaces and backend API services in a Korean enterprise environment.

    • Developing frontend pages with HTML/CSS and JavaScript (jQuery)
    • Building backend services with Java and MyBatis
    • Designing SQL queries and connecting APIs to Oracle database
    • Improving performance and stability of enterprise web applications
    • Working in a cross-functional team using Korean enterprise development patterns
    • Java
    • MyBatis
    • Oracle
    • JavaScript
    • jQuery
    • SQL
    • HTML/CSS
    • REST APIs

  8. 2026

    Claude 101

    Anthropic

    Completed Anthropic's foundational course on working with Claude, covering core concepts of prompting, context, and getting reliable results from AI models in everyday workflows.

    Claude 101 from Anthropic

  9. 2026

    Claude Code 101

    Anthropic

    Completed Anthropic's hands-on course on Claude Code, learning to use an agentic coding assistant for real development tasks such as debugging, refactoring, and building features directly in the terminal — skills applied throughout this portfolio's development.

    Claude Code 101 from Anthropic

  10. 2026

    Java (Basic) Certificate

    HackerRank

    Passed HackerRank's Java (Basic) skill certification test, validating core knowledge of Java syntax, OOP fundamentals, and problem-solving with the language.

    Java (Basic) Certificate from HackerRank

  11. 2026

    Claude Code in Action

    Anthropic

    Completed Anthropic's course on applying Claude Code to real, hands-on development workflows, building on the foundational Claude Code 101 course.

    Claude Code in Action from Anthropic

  12. 2026

    AI Foundations

    OpenAI Academy

    Completed OpenAI Academy's AI Foundations course, covering foundational concepts of working with AI models.

    AI Foundations from OpenAI Academy

  13. In progress

    Deepening Java, Spring Framework Skills & Data Structures and Algorithms

    Self-Learning

    Continuously improving Java and Spring Framework skills, focusing on data structures and algorithms for better problem-solving.

Technical Skills

Engineering stack

Core technologies grouped by the work they support. Project-specific tools stay with the case studies where they were used.

Backend

Designing REST APIs and business logic with Spring Boot and Spring Security.

  • JavaVerified in project or professional experience data
  • Spring BootVerified in project or professional experience data
  • MyBatisVerified in project or professional experience data
  • Spring SecurityVerified in project or professional experience data
  • REST APIsVerified in project or professional experience data
Used inH-PhsarAuthHubDev Lab

Data

Modeling schemas and writing SQL across PostgreSQL and Oracle.

  • PostgreSQLVerified in project or professional experience data
  • OracleVerified in project or professional experience data
  • SQLVerified in project or professional experience data
  • JPA/FlywayVerified in project or professional experience data
Used inH-PhsarAuthHubDev Lab

Frontend Support

Extending backend work into Next.js clients when a product needs a frontend.

  • Next.jsVerified in project or professional experience data
  • TypeScriptVerified in project or professional experience data
  • JavaScript/jQueryVerified in project or professional experience data
Used inHengoMoney FlowKOSIGN

Delivery

Documenting APIs and shipping services with build tooling and CI pipelines.

  • Git/GitHub
  • Maven/GradleVerified in project or professional experience data
  • Docker/GitHub Actions
  • OpenAPI/Swagger
Used inDev Lab

Have a system to build?

I'm available for Java and Spring Boot backend roles, API work, and product teams that value dependable systems.

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