As a software developer

I have experienced software development for almost 30 years. I can summarize the area I was involved in as follows:

• Merchant Server
  • A package software that handles internet shopping mall transactions from font-end to back-end all in one-stop solution.
  • This is the first full-time jab in my career.
  • Mostly I was involved in developing ordering transactions in the backend and also developed installation program in Java language
  • Reference: 한국형 전자상거래 시스템 등장/다우기술 ‘웹스토어’ 개발
• Web Mail Server
  • Maybe the web mail server I developed was the first commercial solution known to Korea.
  • The main language was JavaScript, and I was involved in whole bunch of work
  • Reference: 다우기술, XML 기반 웹 메일 솔루션「위니피 메일」출시
• X-Internet Solution
  • Presentation Server known as X-Internet is a solution that converts the static web page into dynamic application without page refresh. Those solutions were popular at that time.
  • I was involved in revamping server logic for more developer friendly and productivity enhancements.
  • Reference: 쉬프트정보통신, X인터넷 기반의「가우스4.0」출시
• RIA(Rich Internet Application) Solution
  • RIA solution based on JSF(Java Server Page)
  • A software solution that supports developing dynamic web applications through WISWYG tool
  • Reference: 티맥스소프트, 웹 UI 개발 플랫폼 출시, 티맥스, RIA 솔루션 프로웨이브 3.0 ‘GS인증’ 획득
• Web Mail System based on RESTful API
  • Developed webmail solution based on RESTful API to make developing web UI more flexible
  • Unfortunately this project was dropped in the middle of development because of company internal issues.
  • Reference: you can find ‘Skymail’ in the middle of the news content
• Mobile Web App Development IDE
  • Mobile Web App development tool based on HTML5
  • This tool make the mobile app development with easy (SPA – Single Page App)
  • Reference: KT, “‘모벨로’ 활용해 앱 개발 손쉽게”
  • This solution was donated to the public as a Open Source(2013.05)
• Web Based Map Engine
  • Map engine development from scratch. This map engine well adapts to the mobile environment and provides a lot of features including marker clusters, animations, enhanced UX.
  • I gave a presentation with the map engine at the tech conference “올레맵 테크 데이” in 2014
  • Reference: KT, 지도 서비스 올레맵 출시
• OpenGL ES based Map Engine
  • OpenGL ES based native map engine development from scratch.
  • It provides enhanced UX like pinching, panning, 3D etc.
  • This map engine(streaming) has been embedded in car-navigation app “Olleh Navi”, “One Navi” from 2015 as commercial purpose
• Route Planning Engine
  • Java based route planning(optimal path from start to destination) engine development from scratch.
  • This engine is consist of route planning and route guidance
  • This route engine was developed in 2013 but embedded in “On Navi” in 2019 as commercial purpose
• One-Navi App Development
  • All the features On-Navi provides are developed by solely KT developers(In-house)
  • Main features(map engine, route planning engine) of this navigation app was developed by the team I managed.
  • My role in this project was a project manager as well as team leader. The period spent doing this project was the most hardest time in my life.
  • “One Navi” service was ended in 2025.01: ‘티맵’이 독차지한 모바일 길안내 시장…KT ‘원내비’ 내년 1월 서비스 접는다
• I’m working on developing AI-Agent as of now(2025)
  • I’m looking into multi-agent collaborating system.
  • I’m interested in agent technologies for implementing ai agents like langchain, langgraph

As a forest interpreter

I love to go out for hiking mountains if time permitted and am interested in observing the secret life of trees.

The most impressive mountain trails I have hiked are 지리산(성삼재 ~ 대원사) and 설악산(오색 ~ 공룡능선 ~ 비선대 ~ 소공원) mountain trails. I had hard times when I hiked 설악산 even if the length of the 설악산 trail(21km) is half the 지리산 trail (42km). Because 공룡능선 is tough and rocky and it was unable to find water in the middle of the trail.

Observing trees is one of my hobbies the most. So I got a qualification for “Forest Interpreter” issued by Korea Forest Service in 2020

There was compelling need for me to record the growth of trees to study and identify its changing appearance by seasons. As a software developer I made my mind to develop an app for recording the growth of trees. So I developed the Supiami app on my own. You can find the app by visiting https://supiami.com from your web browser.

Anyone who is interested in trees and loves to record the life of trees like pets in the house can use this app for free by signing up through Kakao

I am currently a member of the Korea Forest Association.

Forest Academy in Germany

I had a lucky chance to participate in Wohlleben’s forest academy program located in Wershofen, Germany in 2023.05 And also had a chance to meet Peter Wohlleben who is best seller author of the book “The Hidden Life of Trees” worldwide. It was a great honor to meet the author in person.

If you want to touch with me please email me through dekkiri@gmail.com.