Toyoharu Han
Security Software Engineer II at Sony Interactive Entertainment
Yokohama, Japan
Summary
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Senior🎓
Top SchoolToyoharu Han is a security software engineer with eight years of experience building firmware and platform protections, now working at Sony Interactive Entertainment after leading firmware security efforts at Lenovo. He has hands-on expertise in HSM-based firmware signing, Secure Boot, TPM improvements, firmware vulnerability detection, and BIOS-level development, grounded in a master's in computer science from JAIST. Known as an OSS contributor, he brings a researcher's curiosity—particularly in programming languages and type theory—to practical security engineering. Based in Yokohama, he blends low-level hardware/firmware knowledge with software reliability testing and automation experience from Toshiba and Lenovo. Colleagues rely on him for turning complex security requirements into auditable, production-ready controls across the device stack.
8 years of coding experience
7 years of employment as a software developer
Master's degree, Computer Science, Master's degree, Computer Science at Japan Advanced Institute of Science and Technology
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (30)
chatroom10
solve10
anonymous-users10
vscode10
chat-application10
algorithm9
end-to-end-encryption9
socket-io9
vscode-extension9
chat9
encryption9
cpp9
c-library8
privacy8
cryptography8
Programming languages (4)
Github contributions (5)
toyoh3232/sudoku
Jan 2018 - Feb 2021
Contributions:8 pushes, 1 branch in 3 years
toyoh3232/leetcode
Aug 2020 - Feb 2022
Contributions:24 pushes, 1 branch in 1 year 6 months
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