- Improved the reliability and latency of the Facebook Live Video Trimming feature- Improved the reliability and latency of the muting video function and migrated it to a new infra from a legacy one- Implemented a feature to support trimming for DRM protected videos

Improved the performance of the input system, which uses the Google spreadsheet as a means to interact with the users and the database.Implemented an approval process of changing data, related with multiple DB tables.

- Designed, developed and launched a backend service that fetches and processes data and send them to a downstream service- Migrated a legacy service from an RDB to DynamoDB

2015.8 ~ present Global Mobile Commerce Dev. TF - Responsible for development of an application (iOS, Android, Server) for Shopkick Inc. : Joint work with Shopkick employees as if we are part of Shopkick : The app is to demonstrate how the Shopkick beacons work to Shopkick partners2012.12 ~ 2015.7 Platform Software Development Team - Responsible for development and operation of Push Planet which is a push notification system for Android and iOS : The project includes the development of client SDKs and backend servers. : Deployed in SKP IDC and AWS to support most of internal services as well as US services. - Responsible for development and operation of cloud storage system (known as Planet Space), which is based on OpenStack Swift. : The storage is about 8PB as of 2015.08 and operated with about 300 servers. : Responsible for development and operation of Transcoder Farm, which is used by T cloud, hoppin, T store, T sports, T LOL. - Responsible for development and operation of T cloud service, which is similar to DropBox with more features. : The service consists of clients (Android, iOS, Web), Servers (WAS, DB, etc.), and storage system.2011.9~2012.12 Standardization Team - Directed and planned company's strategy for standardization activities including Tizen, WAC, GSMA NFC & Web Apps programs, OMA, W3C, K-Apps, TTA, etc. - Representative to Tizen, GSMA NFC & Web Apps FTP(Fast Track Project) Steering Committee - Generated a development plan for push notification server and build the dev team

2011.6 ~ 2011.9 Director at System SW Group in Wireless Division2009.1 ~ 2011.6 Project Leader for SLP (Samsung Linux Platform) Project - As a project leader, I was responsible for managing build/SCM, Ecosystem, communication between interested parties internally and externally (i.e. Evangelist). - Developed SLP SDK including components such as IDE, Simulator, GUI Designer, and Documents. - Responsible for build and operation of developer site inside the company - Developed a Distributed App Store for SLP ecosystem - Samsung representative to the Executive Council in LiMo Foundation (09.02 ~ 10.06) . Made SLP as a de facto standard platform for LiMo through negotiation and collaboration among the member companies including Vodafone, DoCoMo, Verizon, SKT, LG, etc.2007 ~ 2008 Project Leader for USN Middleware Project - Developed an intelligent phonebook application. . When a caller wishes to call, the application suggests a certain number of callees to whom the caller most likely wants to make a call. . Devised an algorithm for more accurate suggestions by analyzing call pattern, caller's schedule, etc. - Collaborated with UCLA for Participatory sensing framework (Prof. Deborah Estrin) - Developed a Plug & Play Sensor Platform for USN (Ubiquitous Sensor Network) . The platform includes hardware, client-side application, and server-side program. . IEEE 1451 was used as the standard for detecting the existence of and finding appropriate information about the sensors. . Once sensors around you are found, the platform also lets users connect to services that the sensors can be used. - Developed a Festival Guide Application . The application is mainly for the visitors to large scale festivals such as Edinburgh Festival Fringe. Month-long festival, thousands of different shows, hundreds of venues throughout the city. . The application helps users to plan their schedule based on users’ preferences.

2006 Technical Leader for e-life Project - Responsible for designing and implementing a context-aware system and a corresponding client application. - The system integrates the following technology solutions to provide context-aware services to users: . Indoor positioning, voice recognition, home automation, robot, e-health sensor, RFID technology for Smart Refrigerator. - The system was demonstrated at an exhibit hall in the company for about a year to showcase the company's technical leadership. 2005 Project Leader for RFID Project - Developed a mobile RFID reader and involved in the Korean standardization - Collaborated with other department in the company to implement OSGi Release 42002.10 ~ 2004.12 Technical Leader for Telematics Project - Developed a method for accurate positioning using RFID Tags . This method lets the car know its position even in tunnels and at a lane level. - Led the development of a software platform based on OSGi for Telematics terminals. - Developed an algorithm for finding time-dependent shortest paths . Instead of basing current traffic information where are jammed now, the algorithm anticipates where will be jammed based on the extra information such as the destination of drivers and their current path. - Developed an algorithm for finding danger zones and surveillance cameras on the road. . The algorithm was used for warning drivers faster and more accurately about the information.

Instructor for CS20: An introductory class to data structures (mainly for sophomores, used Java)

Developed a database program in Java

Developed a Java Bean program

- Sindoh makes office products including copier, fax, and printer and provides relevant solutions.- Support engineer (‘91~’93) for the operation of IT infrastructure: maintenance for workstations, education of CAD program (from Schlumberger) for new hires, etc.- Software engineer (’94): developed a printer driver in C.