- Working on cloud platform, software packaging and deployment, devops. - Working on fleet management system of self-driving robots for restaurant.

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- Developed backend API using Spring framework, signal viewer using Vue.js, EEG file reader, which performs efficiently with short latency time for long EEG file. - Designed software system for production service, data models, signal processing pipeline. Reviewed standard EEG file formats available publicly, and designed common internal interface to access EEG file.

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- Online shopping mall company founded in 1996 and listed in KOSDAQ. - 2018.01 ~ 2018.12 - Developed personalized product recommendation models using user behavior log and product database of retail shopping and book. Studied and developed ML models, algorithms. Led a team of developers and analysts. - 2017.11 ~ 2018.01 - Participated in two AI projects, a joint-project with Yonsei Severance Hospital on epilepsy, and a survey project on unattended checkout service using computer vision like Amazon Go.

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- Kakao is a leading messenger company in Korea, and merged Daum Communications. - Daum Communications was a leading portal company in Korea, had strong competence in news, search, blog, and others. - 2014.10 ~ 2016.05 - Server-side developer of ‘Kakao Buy’, a commerce platform of New Commerce Team, usually known as ‘Kakao Gift(카카오 선물하기)’. Covered `Order’ domain of delivery product and mobile voucher, `Claim process’, extending channels of product placement, and others. Had a role as server-side developer of `Kakao Pick’, a social commerce service. - 2013.10 ~ 2014.09 - Had a role as staff of CTO and data analysis division. - 2010.05 ~ 2013.10 - Service developer of Daum Search. Built and operated several major `search collections’ such as twitter, blog, and others. Implemented a text-mining based service for `2012 General Election`. Rebuilt data-integration process among backend data storages and search engine, improved infra-systems of search such as web crawler, large-scale image storage, near-duplicate document db and others.

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- Small software company focused on search engine and business system integration. - 2017.09 ~ 2010.01 - Charged in software solution business and system integration business. Covered project management as well as technical pre-sales, system design, and quality assurance activity. - 2003.09 ~ 2007.08 - Product manager of search engine solution, covered software development, technical support, and project leading.

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