Jaehoon Choi

Experience

• 

  LG Siltron

  Jul 1996 - Jun 1997

  Researcher

  Now at SK Group (http://www.sksiltron.com/)- In charge of the lifetime measurement of wafers - Developed a statistical analysis solution for lifetime data

• 

  Mgame

  Apr 2003 - Mar 2009

  - Utility library including secure socket based on RSAREF - Authentication and server side game logic- Multilayer pathfinding using PathEngine- Front-end server (player management, packet relay between client and game server).- DB cache server (garbage collection, record crc check, player data sharing between game servers). YulGang OnlineParticipated in development as one of the lead server programmers- Server side game logic - Standalone guild server which support read only cache (user created guild mark)-- guild mark cache in client side- Simple event server (which gives real goods) in Java. - DB table schema and sql query. Lunentia OnlineResponsible for security and additional server logic as a server programmer.- Packet library based on Snacc- DB schema and sql query

  • Programmer Project Lead

    Jan 2007 - Mar 2009

  • Lead Server

    Dec 2004 - Dec 2006

  • Programmer

    Apr 2003 - Dec 2004
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  Mgame

  May 2009 - Apr 2010

  Programmer Project Lead

  - Implemented a network using Boost ASIO.- Developed a front-end server responsible for encryption/decryption and broadcasting.- Implemented an instance dungeon server that shares navigation mesh and static assets.

• 

  XL Games

  Mar 2010 - Jan 2021

  Civilization Online (franchise for 2K Games)Led the team-building process for the programming teamLed the development process starting from the prototype as one of the lead programmers- Integration of embedded web browser based on CEF.- Layer based spawner management in server-side.- Replacing CryEngine's pak library.- Integrated PhysX with the world server and zone server, and provided mentoring- Ported various features of CryEngine to the server:-- Exported map data to be compatible with PhysX.-- Implemented segmented world data.-- Developed the vehicle system.- Implemented Region of Interest (ROI) based static/dynamic unit loading and asynchronous asset loading functionality for the player character.- Basic design, implementation, and mentoring for the housing system- Implemented the initial version of in-game modification for the server-side navigation mesh while providing mentoring-- Implementation of divide/conquer, edge swapping and node relaxation. -- Splitting/merging of navigation mesh elements.-- Forbidden area handling around housing.- Mentoring related to pathfinding after implementing a mockup for road and building construction- Implemented a feature where the civilization and related spawn locations change when starting a new game session- Developed secure socket and handled security responsibilities-- Implemented the exchange of session keys for individual users and broadcasting purposes.-- Distinguished critical data between the client and serverSupported project transition to China. Show less

  • Lead Programmer

    Jun 2020 - Jan 2021

  • Lead Programmer

    Dec 2019 - Jun 2020

  • Programmer Project Lead

    Dec 2017 - Nov 2019

  • Programmer Project Lead

    Aug 2010 - Nov 2017

  • Programmer

    Mar 2010 - Jul 2010
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  Penrose

  Jan 2021 - Apr 2021

  Programmer

  Work remotely.- EOS plugin-related bug fixes and migration of blueprints into C++- Integration of the PlayFab account system and AWS GameLift with the VR app.- Setting up NFT development

• 

  Dotdotdot Co., Ltd.

  Apr 2021 - Feb 2024

  Director Of Product Development

  OLOBOIn charge of developing a 3D avatar-based story creation app and platform that supports AI prompts, TTS (Text-to-Speech), and voice features.- Team rebuilding.- Mentoring team members as they are onboarded to enable them to extend and improve the product.- Design and implementation of the server architecture ensuring scalability- Designed and implemented methods for expressing actions and facial expressions- Handling voice files in different formats and versions, as well as video extraction.- Minimizes animation data without degradation by 40% of its original size- Shader maintenance.- Development of game design table tools and automation of build/deployment pipelines.- Launched on iOS and open beta on Android (English-speaking countries). Show less

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  Second Quest

  May 2024 - now

  Chief Programmer

  Joined as a co-founder and developing a mobile game using UE5 and Go language.