About

As of 2026:

Summary

• A cloud architect for web applications with 10+ years of career
• Serving as a tech leader in almost all projects to decide technical stack, to define database schema and to write backend program

Core Skills

• Ruby on Rails (11 years)
• AWS (15 years)
• Technical leader (13 years)

Capabilities

• Programming related
  • Ruby
  • C
  • RDBMS schema design
  • NoSQL
  • Git
  • Linux and Docker
• Cloud related
  • Serverless framework
  • Terraform
  • CI/CD
• IoT related
  • Circuit design / KiCad
  • 3D modeling / Rhinoceros

Personal Works

As the Creator

PicoRuby

• https://github.com/picoruby/picoruby
• An mruby compatible Ruby implementation for one-chip microcontrollers

R2P2

• https://github.com/picoruby/R2P2
• PicoRuby-based shell system for Raspberry Pi Pico (2) (W)

PRK Firmware

• https://github.com/picoruby/prk_firmware
• A keyboard firmware framework written in PicoRuby

As a Committer

• mruby/mruby
• mrubyc/mrubyc
• ruby/irb
• ruby/reline
• rabbit-shocker/rabbit

Publications

n月刊ラムダノート Vol.4, No.1(2024)

• (ja) PicoRubyといっしょに学ぶ、プログラミング言語が電気回路を動かす仕組み

Presentations | Workshops

RubyWorld Conference 2025 / Matsue, Japan

• (ja) Why Now Is the Right Time for PicoRuby

EuRuKo 2025 / Viana do Castelo, Portugal

• (en) PicoRuby Hands-on: Internet of Things Edition

RubyConf Taiwan 2025 / Taipei, Taiwan

• (en) Well, PicoRuby Can Do That

RubyKaigi 2025 / Matz-yama, Japan

• (ja) MicroRuby: True Microcontroller Ruby

EuRuKo 2024 / Sarajevo, Bosnia and Herzegovina

• (en) Embedded Ruby Revolution: A Hands-On Workshop with PicoRuby

Osaka RubyKaigi 04 / Osaka, Japan

• (ja) Where Is PicoRuby Going

RubyConf Arfica 2024 / Nairobi, Kenya

• (en) A Beginner’s Complete Guide to Microcontroller Programming with Ruby

RubyKaigi 2024 / Okinawa, Japan

• (ja) Unlock The Universal Parsers: A New PicoRuby Compiler

RubyConfTH 2023 / Bangkok, Thailand

• (en) A Beginner’s Complete Guide to Microcontroller Programming with Ruby

EuRuKo 2023 / Vilnius, Lituhania

• (en) A Beginner’s Complete Guide to Microcontroller Programming with Ruby

RubyKaigi 2023 / Matsumoto, Japan

• (ja) Build Your Own SQLite3

RubyWorld Conference 2022 / Matsue, Japan

• (en) PicoRuby episode Ⅲ
• (ja) PicoRuby episode Ⅲ

RubyConf 2021 / Denver, the US and online

• (en) On a Keyboard Ruby on Board: PicoRuby and PRK Firmware

RubyKaigi Takeout 2021 / Online

• (ja) PRK Firmware: Keyboard is Essentially Ruby

RubyKaigi Takeout 2020 / Online

• (ja) mruby machine: An Operating System for Microcontoller

RubyConf 2019 / Nashville, the US

• (en) mruby/c: Running on Less Than 64KB RAM Microcontroller

KRKRB 2019 / Cracow, Poland

RubyKaigi 2019 / Fukuoka, Japan

• (en) Practical mruby/c firmware development with CRuby

RubyWorld Conference 2018 / Matsue, Japan

• (ja) Making IoT device with Ruby

RubyKaigi 2018 / Sendai, Japan

• (ja) Firmware programming with mruby/c

Slides: https://slide.rabbit-shocker.org/authors/hasumikin/

Honors & Awards

The first prize winner of the Fukuoka Ruby Award 2022

• http://www.digitalfukuoka.jp/topics/187

A final nominee for the Ruby Prize 2021

• https://rubyprize.jp/21_rubyprize/21_iv-nominees02-ja.html

The first prize winner of the Fukuoka Ruby Award 2020

• http://www.digitalfukuoka.jp/topics/144

Grants

2024 Ruby Association Grant

PicoRuby2: New PicoRuby Using mruby as VM

2021 Ruby Association Grant

picoruby-compiler: An alternative mruby-compiler

2020 Ruby Association Grant

mini mruby compiler (mmrbc)

Education

Chiba University, Chiba, Japan

• Master of Engineering in Design and Architectural Science
• Completed in 2000 / GPA 4.00

Chiba University, Chiba, Japan

• Bachelor of Engineering in Architecture
• Graduated in 1998 / GPA 3.78
• https://badges.wes.org/Evidence