Takeshi Ishii
取締役 CTO at 株式会社クロスリンク
Saitama Prefecture, Japan
Summary
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RockstarTakeshi Ishii is a seasoned technology leader and current CTO with 10 years of hands-on experience building and operating web services and infrastructure across Japanese startups. He blends executive responsibilities—organization building, product direction, and hiring—with deep engineering practice, having led backend Laravel development and served as chief engineer focused on infrastructure. As Development Team Manager he balanced management, direction, and hands-on feature work, and today runs both business and development at 株式会社クロスリンク. An active hobbyist embedded engineer, he has contributed to the widely used open-source QMK keyboard firmware, adding OLED layer displays and RGB test modes—evidence of a pragmatic, hardware-aware coder who likes to roll up his sleeves. Based in Saitama, Japan, he brings a rare mix of leadership, full-stack backend chops, and low-level embedded insight to product-driven engineering organizations.
10 years of coding experience
10 years of employment as a software developer
Japanese
Github Skills (16)
c1710
firmware10
rgb10
avr10
embedded10
c-language10
c-programming10
c1110
cprogramming-language10
microcontroller10
controller10
ws10
sys10
qmk-firmware10
atmel-studio9
Programming languages (5)
Github contributions (5)
qmk/qmk_firmware
Mar 2018 - Aug 2022
Open-source keyboard firmware for Atmel AVR and Arm USB families
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:305 reviews, 171 commits, 362 PRs in 4 years 5 months
Contributions summary:Takeshi contributed to the QMK Firmware project, focusing on the Helix keyboard. The user primarily added and modified keymaps, particularly a "led_test" keymap to test LEDs, and a "five_rows" keymap with various changes. Their work included adding new features such as layer displays on OLED screens, and handling RGB lighting modes, including the integration of a test mode. They demonstrated skills in keyboard firmware development, layer management, and the configuration of OLED displays and RGB lighting.
rp2040firmwareavratmelkeyboard-support
mtei/SemiErgo_Layout
Mar 2017 - May 2018
Contributions:16 commits, 13 pushes, 1 branch in 1 year 1 month
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