Personal Details




+82 10-3229-7392




2004–2007 Sunrin Internet High School



Mentor of Software Maestro program by the Ministry of Knowledge Economy, Republic of Korea.

2007, 2008

Mentor of Winter of Code.


2014– Spoqa

Maintained Dodo, an extremely simple iPad based customer loyalty and marketing platform for local merchants and stores. Merchants can market to customers via the Dodo platform when they check in with their phone number at the counter.

Backend server. [Technologies: Python, Flask, SQLAlchemy, Celery, PostgreSQL, Redis, Fabric, Linux]

2013 The Beatpacking Company

Built Beat, and Android music player app that helps you not only to listen to music on your smartphone, but to make playlists on your own by finding your favorite songs.

Android application. [Technologies: Java, Android, Maven]

Backend server. [Technologies: Python, Flask, SQLAlchemy, Celery, PostgreSQL, Redis, Fabric, Linux, Amazon Web Services (EC2, S3, SQS, ElastiCache, Route 53, CloudFront)]

2012–2013 Crosspop

Crosspop is a social platform where anyone can enjoy creating comics/mangas, share and browse them, and connect with other artists and enthusiasts.

Self-employed as a founder. [Technologies: Python, Flask, SQLAlchemy, Celery, PostgreSQL, Memcached, jQuery, SCSS, Fabric, Linux, Amazon Web Services (EC2, S3, SQS, ElastiCache, SES, Route 53, CloudFront)]

2012 Tipforest

Tipforest is a collaboratively edited open database project.

Worked as programmer. [Technologies: Python, Django, Jinja, PostgreSQL, Heroku]

2011–2012 StyleShare

StyleShare is a social network service for fashion lovers.

Worked as CTO. [Technologies: Python, Flask, SQLAlchemy, Celery, gevent, PostgreSQL, RabbitMQ, Memcached, Redis, jQuery, SCSS, Fabric, Linux, Amazon Web Services (EC2, S3, Route 53, CloudFront)]

2011 Olaworks

Olaworks is a computer vision based company that focuses on facial recognition technology/service.

Maintained ScanSearch, a social network service based on augmented reality technology. [Technologies: PHP, MySQL, Linux]

2010 CDNetworks

CDNetworks provides technology, network infrastructure and customer services for the delivery of Internet content and applications.

Set and maintained a distributed and scalable monitoring system that manages about a million server nodes of CDNetworks. [Technologies: Python, Tokyo Cabinet, PostgreSQL, Linux]

2007–2010 Lunant

Set and maintained VLAAH, a social network service for discovering, sharing and utilizing opinions. [Iteration: 1st, Technologies: PHP, PostgreSQL, PL/pgSQL, Memcached, MooTools, Linux] [Iteration: 2nd, Technologies: Python, SQLAlchemy, Werkzeug, Jinja, PostgreSQL, PL/pgSQL, Memcached, jQuery, Linux]

Set and maintained Hantweet, a service that helps Korean users to tweet texts through SMS. [Technologies: Ruby, Rails, MySQL, Java, Linux, Heroku]

2007–2010 Nielsen Korea

Nielsen Company is a global marketing and advertising research company.

Maintained KoreanClick which provides measurement and analysis of online audiences, advertising, video, consumer-generated media, commerce and consumer behavior. [Technologies: PHP, Oracle, Pro*C, PL/SQL, Memcached, MooTools, HP-UX]

Maintained Searchian which provides keyword suggestion for search marketing, analysis of keyword advertising platforms and measurement of keyword usage. [Technologies: Python, SQLAlchemy, Tornado, Jinja, Oracle, PL/SQL, jQuery, Linux]

Worked as a substitute of mandatory military service.

2006–2007 Olaworks

Maintained Olalog, a photo sharing social network service based on facial recognition technology. [Iteration: 1st, Technologies: Ruby, Rails, PostgreSQL, Prototype, scriptaaculouus, Linux] [Iteration: 2nd, Technologies: PHP, MySQL, Prototype, scriptaaculouus, Linux]

Retired to do liability for military service.

Open Source Projects

2014– Geofront

Simple SSH key management service which helps to maintain servers to SSH, and authorized_keys list for them.

2013– Earth Reader

News reader that is possible to run on various devices and be synchronized without any particular centralized proprietary services.

2012– Asuka

Deployment system for Python web apps using GitHub and Amazon Web Services.

2012– libsass-python

SCSS for Python.

2012– Sider

Persistent object library based on Redis.

2011– Wand

ctypes-based simple ImageMagick (a widely-used image processing library) binding for Python.

2011 futureutils

Python module that introduces futures and promises (theoretical concepts of concurrent programming) into iterators and generators.

2009–2010 Lisphp

Lisp dialect written in PHP.

The above list contains only representative projects founded by me. My detailed open source activities can be found in my GitHub and Bitbucket.

Other Activities


Founder of LangDev, a forum for programming language designers and compiler implementors.