Isao Shimizu


  • Web programming.
  • Infrastructure as a code.
  • Automation and efficiency of infrastructure.

Work Experience

Site Reliability Engineer(SRE), Vantage Studio, mixi Inc., February 2018 - current

SRE of “FamilyAlbum”
  • Optimization infrastructure, databases.
  • Improve developer’s environments.
  • Transition to Kubernetes environment.
  • Jan 29, 2020 “Initiatives to migrate to Amazon EKS for FamilyAlbum (Slide)
  • Jan 25, 2020 “What can SRE do to build and maintain a secure Web system?” (Slide)
  • Aug 28, 2019 “Transfer logs to Amazon Kinesis Data Firehose with Fluent Bit on Amazon EKS” (Slide)
  • Jun 13, 2019 “Container migration in FamilyAlbum” (Slide)
  • Dec 12, 2018 “About Amazon S3 Intelligent-Tiering” (Slide)
  • Oct 31, 2018 “Make AWS infrastructure with GitHub Flow” (Slide)
  • Sep 5, 2018 “What the Mitene SRE team has improved” (Slide)

Site Reliability Engineer(SRE), XFLAG Studio, mixi Inc., August 2016 - January 2018

SRE of “Monster Strike”, etc.
  • Jan 30, 2017 “What we have been working on over the last six months since the establishment of the SRE Group” (Slide)
  • Feb 7, 2017 “Basic things to do with large-scale service” (Slide)
  • Aug 24, 2017 “SRE at XFLAG Studio” (Slide)
  • Nov 29, 2017 “On organizing SRE to support the reliability of Monster Strike” (Slide)

Server Engineer, XFLAG Studio, mixi Inc., April 2014 - July 2016

Operation of “Monster Strike”, “Monster Strike Stadium”
  • Jul 18, 2014 AWS Summit Tokyo 2014 (Link)
  • Jan 17, 2015 “Points to be noted in operation on systemd that I found on site” (Link)
  • Feb 18, 2015 “Amazon EC2 Container Service (ECS)” (Slide)
  • Mar 1, 2016 “Now and future of infrastructure to support MONSTER STRIKE” (Slide)

Operations Engineer, mixi Inc., August 2011 - March 2014

Operation of Social Networking Service “mixi”
  • Optimization of SSL cipher suites.
  • Migrate OS from Fedora 8 to Fedora 17.
  • GRUB 2 bug investigation, reporting and patching (GRUB, Red Hat Bugzilla).
  • Added new function to Cobbler
  • Customization and tuning of Linux kernel.
  • Migration from sysvinit to systemd, maintenance of OS package.
  • Use LXC for production application server, tool development. (Slide)
  • “A story introducing OpenStack and LXC” (Link)

Software Engineer, FUJISOFT Inc., December 2009 - November 2010 - July 2011

Data analysis application project
  • Designed and implemented web application in PHP-Symfony.
  • 1.5 million page views a month or more access.
  • Built replicated MySQL servers, Apache servers, mail servers. All servers are redundant.
  • The database server load balancing, SQL optimization performed. The search and display data to be updated in real time.
  • Search engine optimized and designed HTML and URL.
iPhone/iPad application project
  • Designed and implemented iOS video player library in Objective-C, C++.
  • The library has been adopted as part of the application, Shortly after release, winning the top ranking free download.
  • Ported another video player library for Windows. Using pthread, Audio Units, OpenGL ES.

Technical Manager, FUJISOFT Inc., August 2006 - November 2009

Consumer game application project
  • Managed video player application development teams, video streaming server development team, CMS development team, and operations team.
  • Determining the specification, design review, scheduling.
  • In order to efficiently encode more than 2,000 video, adjust the encoding parameters and batch program design, and implementation. Built Linux servers and load balancers redundancy.
Digital TV project
  • Research and implementation of VoIP and DLNA features digital TV(STB) in C/C++.
  • Research on digital television system in Global.

Software Engineer, FUJISOFT Inc., October 2005 - July 2006

  • Designed and implemented MFP control library in C#.
  • Desinged XML for library. XML defines the MFP operation scenarios.

Software Engineer and Manager, FUJISOFT Inc., June 2004 - September 2005

  • Designed and implemented VB.NET application.

Software Engineer, FUJISOFT Inc., May 2003 - September 2004

  • Implemented WebDAV HTTP client library in C++.
  • Designed and implemented a billing agent program in C++.
  • These software are for the MFP(MultiFunction Printer).

Internship, Assistant Engineer, Broadband Gateway Inc., April 2002 - February 2003

  • Video encoding, log analysis, server build, operate video distribution.
  • Analysis of the log I was using Perl and awk.

Information Center Staff, SANNO University, April 2000 - March 2003

  • Designed and implemented the university web site.
  • Maintained Solaris workstation.
  • Advice on the use of computers for students.


  • School of Information-Oriented Management, SANNO University, Kanagawa Japan 2003
  • Concentration: Image processing. Minami Miyauchi Lab.


  • Research and implementation of watermarking technique. Software can insert and extract the watermark into a bitmap image was developed in C.

Honors /Achievements

FUJISOFT Inc. CEO Special Award & General Manager Award 2005

  • Developed in-house IT asset management software, helping to reduce costs and improve efficiency.
  • This software has been installed on more than 5,000 computers(Win 95~XP).
  • Runtime library Independent as possible, without MFC, efficient use of memory.


  • I am the head of the wind orchestra. Playing the Trombone and conducting.

Computer Skills

  • Languages: Golang, Ruby, C/C++(Windows, Linux), PHP, Python, SQL
  • Platforms: Linux(Ubuntu, Amazon Linux, CentOS, Fedora), Windows
  • Databases: MySQL
  • Server Skills: Nginx, Memcached, Redis, Apache, Postfix, Squid, LVS, Nagios, OpenStack, LXC, Systemd
  • Infrastructure: Terraform, Chef, Ansible
  • Cloud: AWS, GCP, IBM Cloud