Yoshinori Takesako
Division Officer at Recruit Co.,Ltd.
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolYoshinori Takesako is a seasoned technology leader and security expert with 19 years of experience, currently serving as Division Officer at Recruit Co., Ltd. He is a driving force behind Japan’s SECCON CTF series—organizing, chairing the executive committee, and designing challenges for major domestic and international competitions. An OWASP Japan advisory board member, Microsoft MVP in Developer Security, and ISO/IEC JTC1/SC22 expert in languages like C# and scripting, he bridges deep research with practical engineering. His background spans R&D and technical fellowship roles at Recruit and Cybozu Labs, where he focused on secure systems and tooling. A published author and conference speaker (HITCON, OWASP AppSec APAC), he has investigated topics from Flash disassembly to x86 JIT exploitation, revealing a penchant for low-level vulnerability research. Based in Chiyoda, Tokyo, he also leads local developer communities like Shibuya Perl Mongers, combining community building with technical leadership.
19 years of coding experience
20 years of employment as a software developer
Faculty of Information Sciences, Faculty of Information Sciences at 広島市立大学
Github Skills (21)
perl7
usb6
attiny5
poc4
bootloader4
feed4
dfu4
microchip4
acpi4
exploit3
avr3
boot3
pluggable3
aggregator3
security2
Programming languages (5)
Github contributions (5)
takesako/alpine-iot
Jan 2017 - Nov 2017
Contributions:8 commits, 154 pushes, 1 branch in 10 months
prosym/sprosym2024
Jan 2024 - Sep 2024
Contributions:48 pushes, 1 branch in 8 months
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