Shigeaki Matsumura
代表取締役CEO at 株式会社KOETONE
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolShigeaki Matsumura is a Tokyo-based software leader and founder with 16 years of experience building high-reliability systems for finance and web services, currently serving as CEO of KOETONE and Backflip180. He combines low-level systems expertise in C/C++ and Common Lisp with broad scripting and data tooling in Perl, Python, R and Ruby, and has a track record accelerating PRDC pricing engines and improving distributed MapReduce-like systems at Nomura. Known for pragmatic test-driven approaches, he built DSLs and an API-spoofing test environment for legacy trading code and contributed encryption support and security fixes to the widely used rubyzip library. His background in AI (MPhil from The University of Tokyo) and hands-on work across databases and DevOps tooling give him a rare blend of quantitative rigor and full-stack engineering. Colleagues rely on him for hard-to-test, performance-critical problems where sound engineering and creative testing strategies are required.
16 years of coding experience
6 years of employment as a software developer
Master, Artifical Inteligence, Master, Artifical Inteligence at 東京大学 / The University of Tokyo普通科, 普通科, 普通科, 普通科 at Hofu High School
Chinese
Github Skills (16)
test-automation10
ruby10
php10
encryption10
zip10
phpunit10
testing10
fastroute9
routers9
routes9
fileio9
file-access9
router9
file-processing9
file-handling9
Programming languages (16)
Github contributions (5)
dannyvankooten/PHP-Router
Aug 2014 - Aug 2014
Simple PHP Router class (supports REST and reverse routing)
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:10 commits in 4 days
Contributions summary:Shigeaki primarily contributed to the testing of the PHP router library. Their work involved creating and modifying test cases using PHPUnit to ensure the router's functionality, including matching routes and handling different base paths. They refactored the tests by incorporating a data provider for improved test coverage and organization. These efforts demonstrate a focus on validating the router's behavior and ensuring its reliability.
phproutingphp-routerrestrouter
rubyzip/rubyzip
Dec 2014 - Jan 2015
Official Rubyzip repository
Role in this project:Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:9 commits in 17 days
Contributions summary:Shigeaki focused on implementing encryption support within the Rubyzip library. This included adding traditional encryption, handling key management, and integrating encryption into the input and output streams. Furthermore, the user added test cases to validate the encryption implementation and addressed file size issues related to encryption.
encryptionrubyrubyzipzip-extraction
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