Sonoko Mizuki
最高技術責任者 at RoyaltyBank Co., Ltd
Fukushima, Japan
Summary
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Rockstar🎓
Top SchoolSonoko Mizuki is a seasoned software engineer and CTO with 12 years of experience building distributed systems, mobile apps, and payment infrastructure. Trained at the University of Aizu (B.S./M.S. in Computer Science), she has contributed to Hyperledger Iroha’s core C++ and JVM smart contract components and added cryptographic and database unit tests for a widely recognized decentralized ledger project. As CTO of RoyaltyBank and lead at team Mizuki, she blends hands-on backend work in Go, Python, and C++ with mobile development in Java/Dart and cross-platform Flutter. Her career includes collaboration on a national central bank payment system for Cambodia, demonstrating expertise in secure, production-grade fintech systems. Based in Fukushima, she pairs deep protocol-level knowledge with practical cloud and container tooling (Docker, AWS/GCP) and an enduring curiosity that ranges from low-level consensus mechanics to delightful UX.
12 years of coding experience
2 years of employment as a software developer
Master of Computer Science and Engineering, Computer Science, Master of Computer Science and Engineering, Computer Science at 会津大学
Stackoverflow
554reputation
72kreached
2answers
0questions
Github Skills (14)
testing10
c-language10
cprogramming-language10
cryptography10
distributed-ledger-technology9
floatingactionbutton9
dlt9
ledger9
database-management8
kotlin6
augmented-reality6
arcore6
android6
java6
Programming languages (12)
Github contributions (5)
hyperledger-iroha/iroha-dco
Sep 2016 - Dec 2017
Iroha - A simple, decentralized ledger
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 1058 commits, 176 PRs in 1 year 3 months
Contributions summary:Sonoko's contributions focused on implementing and fixing syntax issues within the Iroha decentralized ledger system, primarily within the core infrastructure, and smart contract JVM components. They added unit tests to verify core cryptographic and database functionalities. The work involved low-level C++ code, and likely required an understanding of consensus mechanisms and distributed ledger principles.
ssidltconsensusp2piroha
MizukiSonoko/Story
Aug 2017 - Jan 2018
Contributions:2 releases, 39 commits, 5 PRs in 4 months
pythonread-only
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