Yusuke Hayashi
Founder GenAI & Software Consultant at haya Inc.
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolYusuke Hayashi is a founder and hands-on GenAI & software consultant with over a decade of experience building web, cloud, and AI systems and shipping them into production rather than leaving them as PoCs. He helps companies decompose workflows, design and validate LLM/RAG solutions, implement UI and system integrations, and deliver operational runbooks and compliance-ready handovers. Previously he led a 30+ engineer organization, worked on backend systems at Sony, and contributed front-end improvements to the Tokyo COVID-19 task force site and Python design-patterns—showing both user-facing polish and deep engineering rigor. Based in Tokyo, he offers engagements from sprint-style AI bootcamps to fractional CTO support, uniquely combining decision-making with code-level delivery. He’s particularly focused on pragmatic evaluation metrics and real-world adoption challenges that many AI projects overlook.
10 years of coding experience
8 years of employment as a software developer
Bachelor's degree, Information Technology, Bachelor's degree, Information Technology at The Open University of JapanUniversity of Tokyo
Japanese, English
Github Skills (16)
vi10
design-patterns10
javascript10
nuxt10
vue10
python10
vue-jsx10
covid-testing10
co10
idioms9
testing9
unit-test9
mypy9
html9
unit-testing9
Programming languages (11)
Github contributions (5)
faif/python-patterns
Jan 2021 - Feb 2022
A collection of design patterns/idioms in Python
Role in this project:
Backend Developer
Backend DeveloperContributions:1 review, 8 commits, 4 PRs in 1 year
Contributions summary:Yusuke primarily contributed to the project by updating and maintaining design patterns implemented in Python. They focused on the "creational" and "behavioral" design patterns such as Abstract Factory, Prototype, Iterator, Chain of Responsibility, Specification, Catalog, Command, and Memento, improving their implementation and testing. The contributions involved modifying existing Python code, enhancing functionality, and addressing potential issues through updates to the abstract factory and prototype test suites. Additionally, they addressed typing issues using mypy.
pythonfactoryidiomspatternscomposite
Tokyo-Metro-Gov/covid19
Mar 2020 - Mar 2020
東京都 新型コロナウイルス感染症対策サイト / Tokyo COVID-19 Task Force website
Role in this project:Front-end Developer
Front-end DeveloperContributions:12 commits, 2 PRs, 6 comments in 1 day
Contributions summary:Yusuke primarily focused on front-end development tasks within the Tokyo COVID-19 Task Force website repository. Their contributions involved modifying UI components, specifically the `TextCard` component's link design and implementing smooth scrolling functionality on the flow page. They also addressed linting issues and fixed a typo, indicating a focus on code quality and user experience improvements.
tokyotypescriptforcetask-force
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