Heungsub Lee

Email
[email protected]
Web Sites
Homepage, GitHub Profile, LinkedIn Profile

Interests

Skills

Programming Languages
Go, Python (expert), Bash, C#, Node.js, C
Back-end Technologies
ZeroMQ, Couchbase, Redis, etcd, MySQL, PostgreSQL
Web Development
Vue.js, Lodash, Flask, jQuery, socket.io, HTML5/CSS3, Nginx
DevOps
AWS, Terraform, Google Cloud, Docker, Ansible, systemd, Linux
Test Engineering
Testify, pytest, GitLab CI, Travis CI
Tools
Vim, tmux, ZSH, Visual Studio Code, Git, VirtualBox

Work Experience

Game Server Technical Director
What! Studio in Nexon, 2013–
Developing Durango, a seamless open world MMORPG.

Designing and implementing the architecture of a distributed MMORPG server. Achieved up to 70k concurrent users per MMO world with a scalable geological space. Launched this game in Korea and Indonesia. Maintaining the game service continuously.

Built an internationalization system based on gettext. Implemented a high quality message interpolation focused on linguistics features of Korean and Indo-European languages.

Using Python, C#, Cython, ZeroMQ, MsgPack, Couchbase, etcd, Redis, MySQL, Unity3D, Git, PlasticSCM, Ansible, Fabric, Docker, Ubuntu, and AWS.

Game Development Engineer
Team Lupin in Nexon, 2011–2013
Developed and published mobile and Web series of KartRider, a synchronous multiplayer casual racing game.

Designed and implemented a distributed game server architecture for synchronous multiplayer games for the KartRider Dash and KartRider Coin Rush series. Launched these games globally and maintained them.

Researched various rating systems such as Elo, Glicko, and TrueSkill. Implemented a simple matchmaker for 4v4 or free-for-all racing games.

Used Python, Redis as a message broker, Couchbase, MongoDB, Unity3D, Mercurial, Ubuntu, and AWS.

Full Stack Web Developer
Npine, 2008–2011
Supplies stock images for business on Iclickart.

Developed a web server framework adapting the MVC pattern by PHP5. Made and maintained web sites where provide stock images including Iclickart by the own framework. Maintained physical Linux machines in a data center.

Led the software engineering team.

Front-end Web Developer
Lunant, 2008–2011
Served VLAAH, a social network service for discovering, sharing, and utilizing opinions.

Designed and implemented the UI/UX for VLAAH by PHP5, JavaScript with MooTools, and Python.

Developed jDoctest, which tests JavaScript examples in doc comments, by JavaScript.

Open Source Experience

Hangulize 2, 2018–
Reboot of Hangulize in Go.
Re-implemented Hangulize, which is also listed at the below, to achieve better features, performance, and productivity in Go rather than Python.
Profiling, 2014–
An interactive profiler for Python inspired by the Unity3D profiler.

Developed to find bottlenecks in the Durango server by Python and C. Designed a handy interactive TUI like htop by Urwid.

On GitHub, 2700+ people stared this project. Also it was the 3rd daily trending repository at Sep 22, 2014.

TrueSkill, 2012–
A Python implementation of TrueSkillTM which is a rating algorithm for Xbox Live.
Implemented TrueSkillTM by Python with simple API to learn and share the smart algorithm.
Hangulize, 2010–
Automatically transcribes a non-Korean word into Hangul.

Implemented the library to realize Brian Jongseong Park’s idea by Python and complex regular expressions.

Designed and implemented the Web service and RESTful API by Flask on Google App Engine. Many professional Korean translators visit here to translate undocumented proper nouns.

Others
  • Zeronimo – A distributed RPC system based on ZeroMQ
  • Lets – Several utilities for gevent
  • Energy – Energy system for social games
  • Flask-AutoIndex – mod_autoindex for Flask
  • SUBLEERUNKER – A simple prody game of SUBERUNKER
  • Me2virus – An XSS attack on Me2day, a social network service. When a user looks an infected post, a new infected post was written on the user’s wall.
Contributed
Babel#427, #488; couchbase-python-client#32, #33, #35; etcd#4320; Flask-0.10.1; gevent#608; jQuery-1.4.3; node-irc#3; pytest-rerunfailures#47; PyZMQ#951.

Invited Talks

Education

Computer Software, Kwangwoon University, 2008 – Completed the first year and left in mid course.