- Designing tech stacks and develop on Roovook. It provides simple venue finder for customers, instant booking and simple RFP request solution help customers to proceed their events without hassle to call around hotels.- Pre-A Round (2019, TBT) Raised.- Seed Round (2019, Primer) Raised.

- Startup ‘10fingers’ CTO / Co-Founder. Had primary responsibilities of technical side, design and maintain ‘Datepop' service. As a practical matter, mainly developed Android clients, and Django server as a sub.- Lead and solve various problems such as design new features, server infrastructure, back-end, front-end, user log, service improvement, business model development.- The 'Datepop' service is recommends and reviews places to go out for couples. It downloaded 1.4 million on Google Play Store. (Dec 2017)- Series A (2016, Posco Tech Investment, 1 billion KRW) Raised.- Early Stage (2014, Coolidge Corner Investment, 400 million KRW) Raised.++ Projects ++- Develop 'Datepop' android application.- Develop content upload web system for In-house contents managers.- User behavior log collection / visualization system.- Contents recommendation system based on contents based filtering and collaborative filtering.- 'Datepop' business model development.- Use Geofence to determine visits and user offline high-density geographic measurements.- Troubleshooting API performance issues.

- Research and development advanced RF technologies for LG mobile, in terms of RF amplifiers and RF front-end overall systems. Develop high efficiency LTE power amplifier based on envelope tracking technology.- Change job position to software engineer on 2012. Develop LG mobile power saving features under Android framework / application level. It based on Wifi connections technology and screen brightness control.++ Projects ++- Application of High Efficiency Power Amplifier for LTE mobile devices- Design of adaptive antenna switch for wireless sensitivity drop prevention in hand-held- Android screen backlight control using illumination value within the dark adaptation threshold- Optimize your network profile when you return from a Wi-Fi-specific location

Military service as a KATUSA (Korean Augmentation To the United States Army) soldier on US 8th Army Troop Command. ETS in 2007 as sergeant(SGT).