Skip to content




Block or Report

Block or report m-mizutani

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse

Masayoshi Mizutani


Bogdan's github stats


Masayoshi Mizutani is a security engineer. In university, he was studying and researching about network-based intrusion detection system and malware analysis. After graduation, he worked for various projects, e.g. SIEM (Security Information & Event Manager) integration, SOC (Security Operation Centor) Analyst. Now he is working to build security monitorig system, DevSecOps architecture and various security mechanism at Cookpad Inc.


  • Engineering for Information Security
  • Network Security for Defence, Detection and Security Forensics
  • Data Visualization and Analysis



  • Good in ...
    • Development of backend system (from architecture design to code implementation)
      • e.g. Security log management system, continuous security scanning for container image
      • Prefer serverless architecture
    • Security analyst works for Security Operation Center
    • Reading and writing academic paper
  • Have experinces of ...
    • Risk management of information security
    • Develop web service
  • Not good in ... (sometime mistaken that I'm good in)
    • Penetration testing
    • Malware binary analysis
    • CTF


Security Engineer in Cookpad Inc. (2017.11 - present)

  • Design & Implementation of Security Monitoring System on AWS
    • Security log collection
    • Security log search engine with Amazon Athena ( detail )
      • minerva: Security Log Search Engine
      • strix: Web UI of minerva
    • Security alert detection
      • rlogs: A framework to load remote log files in Go
  • Deploy monitoring software and integration (e.g. Endpoint Detection & Response tool)

Research Staff / Security Analyst in IBM Japan (2011.4 - 2017.10)

  • Research Tokyo (2011.4-2015.3, 2016.10-2017.10)
    • Design and implementation of audit log management system
    • Develop extention and solution of integration for Security Information & Event Manager (QRadar)
    • Deploy Security Information & Event Manager into cloud environment
    • Develop system to collect security information of container system
  • Security Operation Centor (2015.4-2016.9)
    • Detect and analyze security alerts and report to customer
    • Write biannual SOC trend analysis reports
    • Security operation improvement by automation and tool development

Engineer (Internship) in Internet Systems Consortium (2010.12-2011.3)

  • Develop monitoring dashboard for Security Information Exchange


  • Ph.D. in Media and Governance, 2010, Keio University
  • Master of Media and Governance, 2008, Keio University
  • Bachelor of Arts in Environment and Information Studies, 2006, Keio University



Contacts and Social Services

NOTE: Contact me by email ( or Twitter usually. Please mention about your favorite alchohol drink or sweet in the message if you want to talk for hiring purpose. 採用に関するお話につきましては、あなたの好きなお酒かお菓子の話を添えてメールをお送りください


  1. Library to send log as fluentd forwarding message

    C++ 23 5

  2. Fast network packet decoding library in C++

    C++ 23 5

  3. CrowdStrike Falcon log forwarder from falcon S3 bucket to your S3 bucket

    Go 8 6

  4. Serverless SOAR (Security Orchestration, Automation and Response) framework for automatic inspection and evaluation of security alert

    Go 24 6

  5. BADMAN: Blacklisted Address and Domain name MANager

    Go 2 1

  6. Powerful CLI Environment Variable Manager in Go

    Go 4

554 contributions in the last year

Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Mon Wed Fri
Activity overview
Contributed to m-mizutani/octovy, m-mizutani/minerva, m-mizutani/uguisu and 5 other repositories

Contribution activity

June 2021

Opened 9 pull requests in 4 repositories
6 merged
1 open
1 open
1 merged
Opened 1 issue in 1 repository
1 open

Seeing something unexpected? Take a look at the GitHub profile guide.