Experience

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  ケーヨーリゾート開発合同会社

  Apr 2006 - Apr 2008

  ホテル受付係

  Hotel clerk: - worked as a hotel clerk at Sheraton Grande Tokyo Bay hotel - conducted house keeping operation - restraunt clerk

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  I and l software corp.

  May 2008 - Oct 2011

  システムエンジニア

  System Engineer: - worked as a system engineer for KDDI Corp. internal systems - developed web app based on PHP, IIS, Oracle 10g DB - developed desktop app based on MS VBA, Access DB - operated internal contract management system

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  ヤフー株式会社

  Nov 2011 - Sept 2020

  データベーススペシャリスト

  DevOps Team Manager (10/2015 - 12/2019)-Was responsible for deployment and operation of NoSQL database, Apache Cassandra, for most services of Yahoo Japan Corporation.- Managed about 10 members in the NoSQL team.- Developed CI/CD pipelines for 6,000 nodes of Apache Cassandra, using Chef, Fabric and Jenkins.- Developed a web UI to operate 150 Apache Cassandra clusters without logging in servers; the UI could prevent the operators from mis-operations.- Improved and standardized process to operate the NoSQL databases in secure network room.- Supported application developers at Yahoo Japan who used Apache Cassandra for their services.- Designed composition of servers, racks, edge switches for Apache Cassandra clusters for heavy traffic workload. - Contributed to OSS Apache Cassandra by implementing slow query logging feature.Gave speeches at Apache Cassandra tech conference in Japan and the U.S.- Had a NoSQL learning class at Waseda Univ. Tech keywords:- Language: Python, Ruby, Java, Node.JS- OS: Linux- Infra: Private Cloud platform at Yahoo Japan Corporation using OpenStack technology- DB: Apache Cassandra, Graphite- Web Server: Apache, Nginx- Monitoring: Nagios, fluentd, Grafana- Config Management: Chef, Fabric, Jenkins- Tools: Git, IntelliJ IDEASenior System Engineer (11/2011 - 9/2015)- Developed an ad management system for advertisers who used Yahoo Japan’s internet ads. - Managed 10 members who participated in product development of Yahoo Japan ad services. - Worked as a bridge engineer between Yahoo Japan and a software vendor in the U.S. (Chicago) to integrate the data management platform for advertisers in Japan.- Developed the frontend system of the ad platform of Yahoo Japan.Tech keywords:- Language: PHP, JavaScript, HTML- OS: Linux- Infra: bare metal servers in the data center of Yahoo Japan- DB: MySQL, Apache Cassandra Show less

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  ヤマハ（株）

  Feb 2021 - Dec 2021

  ソフトウェア開発者

  Dev Team Manager- Management of 5 members in the development team, implementing a license management system that handles software licenses bundled with network equipment products made by Yamaha.- Lead the development team implementing a web application that promotes communication between Yamaha engineers.Tech keywords:- Language: PHP, Python- OS: CentOS7- Infra: AWS EC2, VPC, API Gateway, Lambda, AppSync- Web Server: Apache- DB: AWS RDS, Neptune- Tools: Git, VS Code Show less

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  日本マイクロソフト

  Jan 2022 - now

  カスタマーサポートエンジニア