- Developed back-end server to manage the lifecycle of modem for connected car service with mobile carrier using Java, Spring, Soap and RestAPI- Developed back-end server for the lifecycle of modem for wifi-hotspot service with mobile carrier using Java, Spring and RestAPI- Developed daily monitoring tool using Python

- Analyzed IoT services of Global and startup companies (i.e. Amazon, Apple, Google, Uber and startups)- Analyzed system architecture, topology, protocol and setup process of IoT services

IoT Service Development - Designed and implemented android applications which can share images, drawing memo, calendar data, to-do lists and shopping lists between home appliances (refrigerators) and mobile devices (https://play.google.com/store/apps/details?id=com.samsung.familyhub&hl=en_US)- Designed and implemented server/client protocols using RESTful - Designed and implemented group management system for one family with samsung account and SMS authentication - Remotely managed and coordinated teams in India to develop iOS applications for Family Hub.- Led technical support for Family Hub post global launch by resolving issues and addressing additional requirements and updatesTeam Lead, Smart Home / Smart Grid - Managed team of five domestic and three offshore associates for Smart Home and Smart Grid service development on Android and iOS- Developed Android applications for users to be able to monitor status of appliances and control remotely. Participated for global launch of the applications(https://play.google.com/store/apps/details?id=com.samsung.smarthome)- Designed and implemented SHP(Smart Home Profile with RESTful) from network connection to server registration for appliances using mobile devices, which became part of the company’s standard libraries - Developed local discovery and connection with SSDP on Android - Developed Android applications and smart TV applications to control appliances automatically in order to save electricity cost- Designed and implemented company standard protocols between mobile devices, appliances and smart meters for users to get electricity cost, energy usage and DRLC.- Led Smart Grid testbeds for three years with three major Korean telecommunication companies (SKT, KT, LGT) and Korea Electric Power Corporation(Kepco)

- Developed Home Network systems including WallPad, GuardPad, PublicEntryPad and each counterpart server system for apartments and townhomes- Designed and implemented video communication system such as visitor call, intercom, broadcast, security alarm, elevator call (C#)- Designed architecture and protocols between client pads, server and third-party devices such as elevators and vehicle control- Designed and implemented applications on client pads using Layer architecture to communicate with server and firmware- Deployed and managed Home Network for more than 10,000 homes in multiple sites. Addressed client issues and requests- Designed and implemented Home Network 2.0 with RUP and use case modeling- Applied Feature model and Software Factory to pack and release for each site’s different requirements

Jan, 2003 ~ May, 2004 : Tiniatek, GangNam-gu, Seoul - Programmer- Making Stress tool for RPC Server with JAVA- Integrate RPC Server and Data Caching SystemDec, 2002 ~ Dec, 2003 : Tiniatek, GangNam-gu, Seoul – Assistant Manager- Spec. Upgrade for Web Application Server(WAS) from J2EE 1.2 to J2EE 1.3- Monitoring server development with SNMP and JNIAug, 2002 ~ Nov, 2002 : Etri, Daejeon – Programmer- Caching System development for Mobile Application Server- UseCase Modeling & Java