Masayoshi Mizutani
Security Engineer at Ubie
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolMasayoshi Mizutani is a Security Engineer with 12 years of experience blending research-grade network security with hands-on software and systems development. He has worked across industry and academia—holding roles at IBM, Keio University, and current security positions at Ubie and Cookpad—focusing on detection, forensics, SIEM, and log analytics. Comfortable from raw OS and network tooling up to modern web services, he applies exploratory data analysis and visualization to hard security problems. His background includes post-doctoral research in malicious software analytics and building monitoring systems, giving him a strong footing in both theory and production practice. Masayoshi is curious about new programming languages, SDN, and distributed systems, and often bridges research insights into practical security tooling. Based in Chiyoda, Tokyo, he combines rigorous academic training (PhD) with pragmatic engineering to deliver auditable, scalable security solutions.
13 years of coding experience
1 year of employment as a software developer
Media and Governance, Computer Science, Network Security, Media and Governance, Computer Science, Network Security at Keio University
English, Japanese
Github Skills (114)
env10
network-analysis10
vulnerability-scanners10
security10
fluentd10
dotenv10
github-app10
golang10
typescript10
environment-variables10
error-handling10
trivy10
aws10
packet-capture10
scanning10
Programming languages (13)
Github contributions (5)
m-mizutani/clog
Jun 2023 - Mar 2026
Customizable Go slog Handler
Contributions:10 releases, 17 PRs, 24 pushes in 2 years 10 months
gogolanglogging
m-mizutani/dnsmap
Jan 2015 - May 2022
Contributions:1 PR, 15 pushes, 3 branches in 7 years 5 months
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