Experience

Fast Forward 패스트포워드

• South Korea
• IT Services and IT Consulting
• 1 - 100 Employee

• CTO

  • Sep 2023 - Present

• iOS Developer

  • Oct 2021 - Present



Instagram

• Software Development
• 700 & Above Employee

• Software Engineer

  • Jan 2021 - Oct 2021



HYPERCONNECT

• South Korea
• IT Services and IT Consulting
• 200 - 300 Employee

• iOS Developer

  • Sep 2019 - Aug 2020

• iOS Developer

  • Jun 2016 - Aug 2019

  * Launched a live streaming application Hakuna in 4 months achieving $2M of monthly revenue - Built a live streaming iOS application handling a set of WebRTC streams based on Reactive Programming paradigm (RxSwift + ReactorKit) - Implemented the entire application from scratch as a lead iOS developer out of two - Accomplished a consistent UI on global languages e.g. Arabic, CJK by dealing with L10n issues - https://hakuna.live * Worked in fast-paced, XFN teams of size 7 to… Show more * Launched a live streaming application Hakuna in 4 months achieving $2M of monthly revenue - Built a live streaming iOS application handling a set of WebRTC streams based on Reactive Programming paradigm (RxSwift + ReactorKit) - Implemented the entire application from scratch as a lead iOS developer out of two - Accomplished a consistent UI on global languages e.g. Arabic, CJK by dealing with L10n issues - https://hakuna.live * Worked in fast-paced, XFN teams of size 7 to 40 - Familiar with agile, code review and automated testing on iOS - Multiple experiences on the full cycle of mobile application development * Hands-on experience in video processing / WebRTC / ARKit on iOS - Worked on a video pipeline that 1) handles incoming camera frames, 2) renders AR effects on a face, 3) transmits the output frames via WebRTC - Resolved 80% of the existing crashes from OpenGLES resulting in 99.73% crash-free users - Optimized battery consumption by selectively processing sample buffers based on the visibility of views. * Maintained Azar, a world-wide top 10 most profitable video chat app - Added new features, fixed bugs and refactored legacy code. Worked on complex & large code base with multiple asynchronous contexts. - https://azarlive.com * Developed a group video chat application, Groovi Launched Groovi to the Apple App Store, a group video chat application based on WebRTC as a lead iOS developer. - https://grooviapp.com * Developed a video chat iOS application, Surf - Developed a video chat application, Surf. Given limited time (2 months) to develop, took advantage of existing code base and released it on Apple App Store successfully within the due. - https://surftheapp.com Keywords: iOS, Swift, Objective-C, Live Streaming, ARKit, WebRTC, L10n (including CJK, RTL languages), RxSwift, testing, in app purchase



Company 100, Inc.

• Software Development
• 1 - 100 Employee

• Software Engineer

  • Aug 2013 - Feb 2016

  * Customized Android built-in WebKit running on TV set-top box (Humax) - Backported several HTML5 features such as FullScreen API, requestAnimationFrame from upstream to the Android WebKit of old revision. - Implemented HbbTV Specification (https://www.hbbtv.org/resource-library/#specifications) for an embedded system (TV set-top box). Contributed about half of the implementation. - Developed conformance test pages using HTML, JavaScript and CSS. Keywords: WebKit, C++, HTML5… Show more * Customized Android built-in WebKit running on TV set-top box (Humax) - Backported several HTML5 features such as FullScreen API, requestAnimationFrame from upstream to the Android WebKit of old revision. - Implemented HbbTV Specification (https://www.hbbtv.org/resource-library/#specifications) for an embedded system (TV set-top box). Contributed about half of the implementation. - Developed conformance test pages using HTML, JavaScript and CSS. Keywords: WebKit, C++, HTML5, HbbTV, JavaScript, CSS, Embedded System * Participated in a research project to improve utilization of multicore CPU & GPU on web browser (funded by South Korea Government) - Improved WebWorker. Reduced costs to create and destroy WebWorker using threadpool. - Integrated an existing WebCL implementation (https://github.com/SRA-SiliconValley/webkit-webcl) to the project. During the integration, fixed several critical bugs. - Contributed to the official WebCL conformance test maintained by Khronos Group (https://github.com/KhronosGroup/WebCL-conformance) Keywords: WebKit, C++, HTML5, JavaScript, WebCL * Developed a single-page web application for mobile - Developed a web application that uploads an image taken from mobile device to the analysis server (matlab) and gives its computation result back to user. - Built on Node.js (backend), React (frontend) & Flux architecture and WebSocket. - Dealt with orientation issues of an image taken from a mobile device on client-side. Keywords: Node.js, JavaScript, CSS, React * Developed an image crawling system - Developed a coordinator written in Go which consists of several pipeline processes: 1) parsing metadata, 2) downloading images, 3) passing the images to a feature extractor server and 4) archiving the output features as files. Keywords: Go Show less * Customized Android built-in WebKit running on TV set-top box (Humax) - Backported several HTML5 features such as FullScreen API, requestAnimationFrame from upstream to the Android WebKit of old revision. - Implemented HbbTV Specification (https://www.hbbtv.org/resource-library/#specifications) for an embedded system (TV set-top box). Contributed about half of the implementation. - Developed conformance test pages using HTML, JavaScript and CSS. Keywords: WebKit, C++, HTML5… Show more * Customized Android built-in WebKit running on TV set-top box (Humax) - Backported several HTML5 features such as FullScreen API, requestAnimationFrame from upstream to the Android WebKit of old revision. - Implemented HbbTV Specification (https://www.hbbtv.org/resource-library/#specifications) for an embedded system (TV set-top box). Contributed about half of the implementation. - Developed conformance test pages using HTML, JavaScript and CSS. Keywords: WebKit, C++, HTML5, HbbTV, JavaScript, CSS, Embedded System * Participated in a research project to improve utilization of multicore CPU & GPU on web browser (funded by South Korea Government) - Improved WebWorker. Reduced costs to create and destroy WebWorker using threadpool. - Integrated an existing WebCL implementation (https://github.com/SRA-SiliconValley/webkit-webcl) to the project. During the integration, fixed several critical bugs. - Contributed to the official WebCL conformance test maintained by Khronos Group (https://github.com/KhronosGroup/WebCL-conformance) Keywords: WebKit, C++, HTML5, JavaScript, WebCL * Developed a single-page web application for mobile - Developed a web application that uploads an image taken from mobile device to the analysis server (matlab) and gives its computation result back to user. - Built on Node.js (backend), React (frontend) & Flux architecture and WebSocket. - Dealt with orientation issues of an image taken from a mobile device on client-side. Keywords: Node.js, JavaScript, CSS, React * Developed an image crawling system - Developed a coordinator written in Go which consists of several pipeline processes: 1) parsing metadata, 2) downloading images, 3) passing the images to a feature extractor server and 4) archiving the output features as files. Keywords: Go Show less



KMIC Global

• Seoul, Korea

• Software Engineer

  • Aug 2012 - Aug 2013

  * Developed mobile application Developed an android application using Corona SDK and Lua. Corona is a universal SDK for cross-platform mobile app development. Keywords: Corona SDK, Lua * Developed realtime pitch detector Implemented realtime pitch detection algorithm (Harmonic Product Spectrum). Keywords: Pitch detection * Developed mobile application Developed an android application using Corona SDK and Lua. Corona is a universal SDK for cross-platform mobile app development. Keywords: Corona SDK, Lua * Developed realtime pitch detector Implemented realtime pitch detection algorithm (Harmonic Product Spectrum). Keywords: Pitch detection



Smart Comz

• Seoul, Korea

• Part-time iOS Developer

  • Aug 2011 - Aug 2012



Swink

• Seoul, Korea

• Part-time iOS Developer

  • Sep 2010 - Apr 2011