I'm a Full-Stack Engineer with 7+ years of experience building enterprise web applications, SaaS platforms, AI-powered systems, and cloud solutions.

My main focus is building practical software that solves business problems — from frontend applications and REST APIs to AI workflow automation, cloud infrastructure, and performance optimization.

• 💻 7+ years of professional software development experience
• 🤖 Full-Stack & AI Developer
• 🌐 Enterprise Web Applications & SaaS
• 🧠 LLM Applications, RAG & Prompt Engineering
• ☁️ AWS, Docker, Kubernetes & Terraform
• ⚡ Performance Optimization & System Design
• 🔄 CI/CD & Development Automation
• 🏗️ REST APIs, Microservices & Cloud Architecture
• 👥 Code Reviews, Technical Discussions & Developer Mentoring

• OpenAI API
• Claude API
• LangChain
• Retrieval-Augmented Generation (RAG)
• Prompt Engineering
• AI Workflow Automation

• Git / GitHub
• Jira
• Postman
• Figma
• Agile / Scrum
• CI/CD

Nov 2024 – May 2026 · Tokyo, Japan

Worked on AI-powered enterprise applications and workflow automation.

• Designed AI-powered enterprise applications used by 500+ business users
• Reduced manual workflow time by 60%
• Developed LLM workflow automation that reduced document processing time by 70%
• Built backend services handling 1M+ API requests per month
• Maintained 99.9% availability
• Improved AI response accuracy by 25% through prompt engineering and RAG optimization
• Integrated 10+ internal and third-party systems
• Participated in technical discussions and code reviews
• Mentored engineers and contributed to engineering standards

Apr 2021 – Oct 2024 · Tokyo, Japan

Developed enterprise HR SaaS applications for employee and payroll management.

• Developed HR SaaS applications supporting 100,000+ employees
• Built 30+ RESTful APIs for employee, payroll, and attendance management
• Reduced employee search response time from 3 seconds to under 1 second
• Optimized SQL queries for improved application performance
• Reduced payroll batch processing time by 50%
• Automated CI/CD workflows and reduced deployment time by 40%

May 2019 – Mar 2021 · Tokyo, Japan

Focused on enterprise web applications and frontend performance.

• Delivered 15+ enterprise web applications
• Built 50+ reusable React components
• Reduced new feature development time by 30%
• Improved page loading speed by 40%
• Increased Google Lighthouse performance score from 70 to 95
• Improved Core Web Vitals
• Worked in Agile teams of 8–12 engineers
• Participated in two-week release cycles

I enjoy working across the entire application stack:

Frontend
   ↓
React / Next.js
   ↓
REST API / GraphQL
   ↓
Node.js / FastAPI
   ↓
PostgreSQL / MongoDB / Redis
   ↓
AWS / Docker / Kubernetes

My AI development experience focuses on integrating LLMs into practical business applications:

User Input
    ↓
Application
    ↓
LLM / OpenAI / Claude
    ↓
RAG / Vector Retrieval
    ↓
Business Logic
    ↓
Automated Workflow
    ↓
Result

• Full-Stack Development
• AI Application Development
• LLM Integration
• RAG Systems
• Prompt Engineering
• AI Workflow Automation
• System Design
• Cloud Architecture
• Microservices
• REST API Development
• Database Optimization
• Performance Optimization
• CI/CD
• Code Review
• Agile Development

Bachelor of Computer Science Kochi University · 2015 – 2019

Final CGPA: 3.8

• 🇯🇵 Japanese — Native
• 🇺🇸 English — Professional Working Proficiency

I'm particularly interested in projects involving:

• AI-powered SaaS
• Enterprise applications
• Business process automation
• LLM applications
• RAG systems
• Internal business platforms
• Data-intensive applications
• Cloud-native systems
• Developer productivity tools

Email: uytwqhbclpf379@gmail.com

📍 Tokyo / Chiba, Japan

If you're interested in Full-Stack Development, AI applications, SaaS, or cloud-based systems, feel free to explore my repositories.