[Hadoop 2009-2013]It's around 2009 when I first met hadoop.Have managed a few clusters from some tens of machine cluster to 1000+ machine cluster. Mobile spatial statistics are one of the applications we've implemented over the 1000+ machine cluster.Implemented MR functions running daily/monthly to archive files into bigger ones using python and java. Our 1000+ hadoop cluster is Highly Available by heartbeat and DRBD, taking advantage of quite new tecnologies at that time. Have experiences on ganglia module implementation for hadoop monitoring, Hive, HDFS federation etc.cloudera certified hadoop administrator. [Log analysis 2014]Before I left docomo, I had been working on access log analysis for d-market using splunk, R, and python. [Ad technology 2015-2016]Working for nhn entertainment on ad technologies as well as smartphone app (specifically, games) performance marketing based on various data analysis. Developed first version of data management platform in nhn entertainment with e-commerce data and app activity data.[Business intelligence 2017-2020]Taking in charge of business intelligence and analytics office to provide executive summaries, business indices, and app specific data analysis from company's various data. Specifically, directed poc of location-and-payment history based coupon delivery system. Also have directed poc of fashion trend analytics based on fashion marketplace payment data. [Edutech AI and Data 2020~]Specialties: hadoop, R, splunk, python (jupyter), ad technologies, twitter japanese keyword analysis, ad eco system in japan and korea, business intelligence/analytics, Interested these days in: business development based on data (business intelligence/analytics)