The University of Tokyo​
Master’s Degree in Computer Science​

Specialized in software engineering, data systems, and applied AI
Conducted research related to intelligent systems and scalable architectures
Completed advanced coursework in algorithms, machine learning, and system design

Hello!

My name is Hayato Kato, a Japanese Full-Stack Developer and AI Developer with more than 9 years of professional experience in building scalable web applications and intelligent systems.

I also have extensive experience in strategic planning, including grow data.

I have a strong background in frontend and backend development, as well as AI-driven solutions, including data processing, automation, and system optimization. I focus on writing clean, maintainable code and delivering practical, business-oriented results.

With experience working on real-world production systems, I enjoy solving complex problems, collaborating with global teams, and turning ideas into reliable, high-quality products. Clear communication, responsibility, and long-term value are central to how I work.

Work experience

1. Full-Stack Developer (Freelance)
   2023 – Present
   Developed full-stack web applications for international clients
   Designed RESTful APIs and backend systems
   Implemented authentication, database schemas, and cloud deployments
   Collaborated directly with clients to gather requirements and deliver high-quality solutions
   Technologies: JavaScript / TypeScript, React, Node.js, Python, SQL / NoSQL, Cloud Platforms

2. Software Engineer / AI Developer
   TechnoBridge Solutions Inc. (Japan)
   2022 – 2023
   Developed internal web systems and AI-assisted tools for business automation
   Implemented machine learning models and integrated them into production services
   Handled data preprocessing, model deployment, and API integration
   Improved system performance, reliability, and scalability
   Technologies: Python, Machine Learning, Backend APIs, Data Engineering

3. Web Developer
   Mirai Works Lab Co., Ltd. (Japan)
   2021 – 2022
   Built and maintained web applications for small and mid-sized clients
   Developed responsive frontends and backend business logic
   Worked with databases, authentication systems, and server-side frameworks
   Assisted in maintaining legacy systems and improving code quality
   Technologies: HTML, CSS, JavaScript, Backend Frameworks, Relational Databases