Yuki K
Security Engineer at Mercari, Inc.
Mars, Auvergne-Rhône-Alpes, Japan
Summary
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Senior🎓
Top SchoolYuki K is a Security Engineer with a decade of experience bridging applied cryptography, post-quantum research, and production security for platforms and developer infrastructure. They have delivered practical security and infra work across industry and academia—from building searchable encrypted databases and a .NET PQC library integrated into Bouncy Castle to hands-on platform and IAM roles at companies like Mercari and Coles. Comfortable switching between research and ops, Yuki has implemented NTRU Prime/NTRU from C to C# and highly parallelised encrypted query pipelines using Apache Spark, demonstrating both low-level crypto fluency and large-scale systems thinking. Recent roles span platform security, penetration testing, and trading network infrastructure, showing an ability to secure fast-moving, high-stakes environments. Based in Mars/Auvergne-Rhône-Alpes with ties to Japan, they combine global perspective with open-source contributions that advance post-quantum tooling. Notably, their work has moved experimental cryptography into production-ready libraries used by broader ecosystems.
10 years of coding experience
3 years of employment as a software developer
Bachelor of Computer Science Advanced (Honours), Computer networks and security, Bachelor of Computer Science Advanced (Honours), Computer networks and security at Monash University
English, Japanese, ChineseGithub contributions (5)
uncountablecat/instagram_statistics
Jun 2016 - Aug 2016
Contributions:16 commits, 21 pushes, 1 branch in 2 months
uncountablecat/analytics_python
Jun 2017 - Oct 2018
Contributions:18 pushes, 1 branch in 1 year 3 months
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