Yuichiro Saito
Senior Manager at PayPay Corporation
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolYuichiro Saito is a senior engineering leader with 12+ years building high-throughput payment, fraud prevention, and listing systems at scale, currently heading the System Platform Department at PayPay. He was a tech lead at Mercari during hypergrowth and played a hands-on role in product, compliance (AML/CFT, KYC), and the company’s IPO, delivering features that moved hundreds of millions in monthly flow. At AWS Japan he served as a Solutions Architect supporting FinTech startups and contributed to industry-wide API guidance at FISC, bridging technical delivery with regulatory expectations. His early career spans infrastructure automation, monitoring and test automation (notably contributions to the cross-platform Serverspec project), and performance work that drove multi‑fold operator productivity gains. With an academic background in Management Systems Science from University of Tsukuba, he blends systems thinking, cross-functional leadership, and deep operational experience to ship reliable, auditable financial systems.
12 years of coding experience
18 years of employment as a software developer
Master of Business Sciences, Computer Science and Business Administration, Master, Master of Business Sciences, Computer Science and Business Administration, Master at University of Tsukuba
Japanese, English
Github Skills (9)
rspec10
php10
serverspec10
test-automation10
solaris7
debian7
redhat7
gentoo7
darwin7
Programming languages (3)
Github contributions (5)
mizzy/serverspec
Jul 2013 - Jul 2013
RSpec tests for your servers configured by CFEngine, Puppet, Chef, Ansible, Itamae or anything else even by hand
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:14 commits in 2 days
Contributions summary:Yuichiro primarily focused on adding and updating tests for the Serverspec project, specifically related to PHP configuration. They introduced new test files for various operating systems (Darwin, Debian, Gentoo, Solaris) and refactored existing tests, changing the configuration method from `ini_get()` to `get_cfg_var()`. The commits demonstrate a focus on ensuring the project's functionality across different platforms and improving test coverage for PHP configuration aspects.
cfenginepuppetansiblerubyrspec
koemu/dotfiles
Jan 2015 - Oct 2016
Contributions:13 pushes in 1 year 8 months
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