Corporate Website
Nagase
Planning, design, and development of a corporate website to communicate company information and services.
- WordPress
- PHP
- HTML
- CSS
- JavaScript
AI Product Engineer
Yuki Sasai
From web development to AI-powered products.
5+ years and 50+ websites delivered. Now building with AI and modern web technologies.
Tokyo, Japan · Remote · 佐々井 裕希
50+
Websites Built
5 Years
Experience
WordPress
Professional
Next.js & AI
Growing
About
Design, build, ship.
I started my career in a digital advertising agency, where I worked on Meta Ads operation, creative production, campaign optimization, and performance improvement.
After that, I became independent and focused on web development, contributing to more than 50 website projects. My experience includes corporate websites, recruitment sites, landing pages, and e-commerce sites, primarily built with WordPress.
Currently, I am expanding my expertise into Next.js, TypeScript, system design, Python, and AI-powered product development.
My goal is to combine advertising, marketing, web development, and system design to build products that solve real business problems.
In the long term, I aim to become an AI Product Engineer who helps businesses and local communities solve meaningful challenges through AI-powered products.
Career
Career Timeline
2019
2019
Ad Agency
Meta Ads operation, creative production, campaign optimization
→
Independent / Freelance
Went independent, focusing on web development
50+ Web Projects Delivered
Corporate sites, landing pages, recruitment sites across industries
WordPress Development
Theme development, customization, and maintenance
Shopify / E-commerce
Store setup, product management, UI design
→
Next.js / TypeScript
Transition to modern frontend stack
System Design
Learning scalable product architecture
→
AI Product Development
LLM, RAG, prompt engineering
Now
Now
Global AI Product Engineer
Bridging AI and Web for global impact
Services
What I Can Help With
- WordPress Website
- Corporate Website
- Landing Page
- Shopify
- Website Renewal
- System Development
- SEO Optimization
- AI IntegrationComing Soon
Process
How I Build Products
01
Discovery
Understanding business challenges, user needs, and the competitive landscape
02
Planning
Requirements definition, technology selection, and architecture design
03
Design
UI/UX design, prototyping, and iterative review
04
Development
Clean code, responsive implementation, and performance optimization
05
Testing
Cross-browser, mobile, and accessibility testing
06
Launch
Deployment, SEO optimization, and performance verification
07
Support
Maintenance, monitoring, and continuous improvement
Projects
Professional Projects
End-to-end projects — from identifying challenges to design, development, and launch.
Corporate Website
Livvy
Planning, design, and development of a corporate website reflecting the brand identity. Implemented responsive design and SEO optimization.
- WordPress
- PHP
- HTML
- CSS
- JavaScript
Landing Page
Gym Landing Page
UI design and front-end development of a landing page for gym customer acquisition.
- HTML
- CSS
- JavaScript
Skills
Skills
Frontend
- TYTypeScript
- REReact
- NENext.js
- TATailwind CSS
- HTHTML
- CSCSS
Backend
- NONode.js
- PYPython
- PHPHP
CMS
- WOWordPress
- SHShopify
Database
- POPostgreSQL
- SUSupabase
Cloud
- VEVercel
- GIGitHub
Tools
- FIFigma
- VSVS Code
- GIGit
AI
- LLLLM Apps
- RARAG
- CLClaude
System Design
System Design
I'm learning system design to build products that are scalable, maintainable, and secure.
- Requirements
- ER Diagram
- API Design
- Authentication
- Authorization
- Architecture
- Security
Writing & Learning
Writing & Learning
I write about Next.js, TypeScript, system design, and AI on Zenn.
GitHub
GitHub Activity
Contact
Web, AI & System Development — Get in Touch
From websites and WordPress to system development and AI-powered workflow automation — let's talk.