* 150+ Group Members - Customer eXperience - Back-end Platform - Front-end Web/App - Advertise Platform - Leisure/Flight Platform - QA* Yanolja as a Super App - Domestic/International Airline Services* Achievements - Integrated Accommodation Settlement - CPM(Cost Per Mille) Advertising - Dynamic Work Style: on-site -> hybrid -> remote work -> hybrid

* Overseeing the Technology and Product aspects of Yanolja's Booking Platform * 350+ Group Members (Product Owner, Developer/Engineer, Designer, Analyst) - Customer eXperience - Back-end Platform - Front-end Web/App - Advertise Platform - Cloud Platform(System Engineering, Database Engineering, Cloud Engineering) - Information Security - Data Infrastructure, Data Analysis - Search/Recommendation - UX(User Research), PXD(Product eXperience Design) - QA, PMO* Yanolja as a Super App - Leisure/Mobile Ticket services - Food & Beverage waiting services - Teleport Services (KTX, Express Bus, Car Rental)* Daily Hotel Service ( https://www.dailyhotel.com/ )* Now Waiting Service ( https://home.nowwaiting.co/ )* Achievements - Every year, new records for reservations - No.1 OTA in Korea at government-hosted national campaign a.k.a. "대한민국 숙박대전" (2020) - 10 million cumulative registered users (2021) - Architectures: Monolithic -> Micro Service Architecture -> Event-driven Architecture on AWS - Expanding hybrid pages: User registration, campaigns and PDPs - Introducing a static content web page: App/Web reuse, traffic reduction and cost savings - Adoption of a self-service EDA(Exploratory Data Analysis) ecosystem organization-wide - Team-wide Reflection on a 6-week Cycle has reached 39th iteration - 3-Month Retrospective of a New Employee

Platform Unit = Back-end Platform Division + Extranet Division* 70+ Unit Members (Product Owners, Developers, UI/UX Designers)* Platform Products: Member, Property, Rateplan, Surcharge, Region, Inventory, Reservation, Payment, Settlement, Coupon, Point(Coin, Biz Point/Cash), Display Advertising, Review & Rating, Messaging(SMS, LMS, Push, E-mail, FAX, Virtual Number), Terms of Service, Customer Contact System, Chatbot* Extranet Products: Partner, Partner Contract, Partner Business Model, Partner Center(PC/Mobile), Smart Front PMS, Hotel Extranet, Pension Owner's Site, Pension YBS(Yanolja Booking System)* Projects: BPR/PI, Electronic Financial Transactions

Head PO(Product Owner) of Back-end Platform, CPO(Chief Privacy Officer)Platform Design and Development* 30+ Division Members(Product Owners, Developers)* Platform Products: Member, Inventory, Reservation, Payment, Exact Calculation, Coupon, Point, Mileage, Search, Advertising, Content Management, Image Content, UGC, Messaging(SMS, LMS, E-mail, Push, Virtual Number), Admin ACL, Terms of Service, Customer Contact System, Chatbot* Platform Targets: Domestic/Overseas Motel/Hotel/Pension/Guest House, OTA(Online Travel Agency), Leisure ticket

* Plaster(Planet Master) of Big Data Infrastructure, since 2013* member of Architecture Review Board, since 2015* Pre-Assessor of Hiring Programmer, since 2013* Mentor of 101 Startup Korea, mentor-driven startup accelerator program by SK planet, (2013-2014,2016)Data Infrastructure Team/Business Intelligence Promote Office * in charge of Targeting System for Syrup Store, merchant mobile marketing platform (Hadoop, Impala, Phoenix/HBase) - review Agreement of the Data Policy(Terms of Service) for cross channel targeting -- personal information protection act -- act on the protection, use, etc, of location information * Data Retrieval Infrastructure (HBase/Phoenix, ElasticSearch) * Real-time Stream Processing Infrastructure - real-time reconstructing of user status for Syrup/OKCashbag (Spark, HBase/Phoenix) - real-time reconstructing of personal BLE/Wi-Fi/Geo-fence information (Spark Streaming, HBase/Phoenix) - http://readme.skplanet.com/?p=12465 Building Lossless Stream Processing Infrastructure with Spark Streaming - http://www.slideshare.net/taewook/lossless-stream-processing - http://readme.skplanet.com/?p=13297 Changing RecoPick Real-time Data Processing System (Strom -> Spark Streaming) * Recommendation Engine for E-Commerce (Spark, Spark Streaming, HBase/Phoenix) - Cross Site/Client Real-time Recommendation - CTR(Click-through rate) based MAB(Multi-armed bandit) - ViewTogether, BuyTogether - http://readme.skplanet.com/?p=13507 Changing recommendation engine for 11st, from RecoPick to ColloseoData Infrastructure Team/Data Lab. * develop FDS(Fraud Detection System) for T Store, the largest Android app market in Korea (Hadoop/Cascading, Python) * Real-time/Batch ProcessingNew Product Tech. Development Team/Product 3 Lab. * technical consulting/designing of new products

http://11math.com/auto generated mathematic problems for elementary school studentsacq-hired by SK planet

Data Design&Analysis Division/Data Information CenterDesign Game Log for MMO & Casual Game * improve Game Log Design Process * define context & log * QA for Game LogLarge Data Processing, Real-time Processing, Parallel Processing for MMORPG logs * develop real-time processing system(a.k.a. Octopus) for MMORPG (Aion, Blade&Soul) logs (HDFS, Zookeeper, Java) * make infra data from MMORPG(Aion, Blade&Soul) logs (Hadoop/Cascading, Redis) * game replay with logs for instance dungeon * visualize game data via mapTeam Management * 3 ~ 8 team members

Data System Infra Division/Data Information CenterLarge Data Processing, Parallel Processing for MMORPG logs * make usable/usefull data from MMORPG(Aion, Blade&Soul) logs (Cascading, Redis, Zookeeper) * sessional context data * transactional behavior data * develop real-time processing system for MMORPG logs (HDFS, Redis, Zookeeper) * evaluate data quality of infra data of MMORPG * make game character time-line

Data CenterLarge Data Processing, Parallel Processing for MMORPG logs * make data for Data Mart (Cascading) * make data for GMCON(Game Meyer COntents Notification) (Cascading, MSSQL) * make in-game data for Character Balloon Title of AION MMORPG * introduce session & transaction logs for MMORPG logs * apply session & transaction logs to make Core Data of MMORPG * introduce horizontal & vertical logs for MMORPG logs * have a presentation of introducing data pipeline for analyzing MMORPG logs

Openmaru Studio * Search Engine, Blog Search Service - Apache Module for dynamic loading of search modules (C) - Korean Natural Language Processing (C) - Operation automation (Bash script) - Broker for distributed search (Java) * Contents Parser - target contents: blog, music album, BBS, news paper site - X-Ray: adaptive XHTML parser with XPath & Regular Expression (Java) - Distributed X-Ray with Hadoop MapReduce (Java) * member of Strategic Planning Task Forces - Blog Search (BSTF) planning - Content Network (CNTF) planning - Data Driven Development & Publishing (DDDPTF) planning

Internet Portal (NAVER) Search Service * Entoi/Blog/Cafe/Music/Job Search service - Apache Module for integration of search engine and web service (C) - partitioned indexing for public/private blog posts (C) * Search Platform - MVC-model framework for integration of search engine and web UI (C)

Internet Firewall * Suhoshin series for Solaris Unix - Bug fix and supporting - ICMP NAT function * Absolute series for Appliance (Linux based) - main integration module with light web server - packaging and consulting - porting to embedded linux (Power PC)