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Satomune Mie

@satomunemie

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Senior AI and full-stack engineer building scalable, production-grade AI systems.

Japan

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What I'm looking for

I seek roles building AI-native, scalable production systems (LLMs/RAG), focusing on product impact, reliability, cost-efficiency, and team velocity.

I am a Senior AI & Full-Stack Engineer with 7+ years of experience building intelligent, scalable, production-grade systems that combine distributed backend engineering and applied machine learning.

I specialize in AI-native platforms powered by Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), and structured automation workflows, and have architected multi-tenant SaaS platforms handling millions of API requests per month.

My work includes designing RAG systems indexing 100K–500K+ documents with sub-second retrieval, engineering real-time analytics and ML scoring pipelines, and delivering AI dashboards and developer tooling that materially improve decision-making and productivity.

I operate with a product mindset focused on performance, cost-efficiency, security, observability, and long-term scalability, and I have provided architectural consulting to startups preparing systems for scale and investor due diligence.

Experience

Work history, roles, and key accomplishments

Current

Senior AI & Full-Stack Engineer

Current

Freelancing

Apr 2024 - Present (1 year 10 months)

Architected and launched 6+ AI-native SaaS platforms, designed RAG systems indexing 100K+ documents with sub-second retrieval, and engineered multi-tenant architectures handling 5M+ API requests/month at 99.9% uptime while reducing cloud costs ~25%.

RAG Python TypeScript PostgreSQL Kubernetes Redis BullMQ Docker

Full Stack / LLM Engineer

Kudasai Co

Oct 2022 - Apr 2024 (1 year 6 months)

Built a semantic AI search platform indexing 500K+ documents and designed domain-specific RAG pipelines improving retrieval precision by 35%; fine-tuned compact LLMs to raise automated report accuracy by 30% and halved documentation time.

RAG Fine Tuned LLMs Next.js fastAPI Docker Kubernetes Anomaly Detection PostgreSQL

Full Stack Developer

Keyence Corporation

Apr 2021 - Oct 2022 (1 year 6 months)

Developed enterprise web platforms used by 1,000+ employees, optimized REST APIs to reduce response time by 35%, and rebuilt analytics dashboards to improve reporting efficiency by 40%.

React TypeScript REST APIs Microservices PostgreSQL Docker CI CD

Frontend Developer

Keyence Corporation

Apr 2018 - Apr 2021 (3 years)

Built a scalable React component library adopted across enterprise systems, reduced task completion time by 25% through workflow redesign, and improved cross-team API integration reliability.

React TypeScript Component Libraries CI CD API Integration TailwindCSS

Education

Degrees, certifications, and relevant coursework

Kensai University

Bachelor of Informatics, Informatics

2015 - 2018

Completed a Bachelor of Informatics focusing on software engineering and applied AI concepts, preparing for roles in full-stack and ML-infused systems.

Osaka Prefectural Seijo Technical High School

High School Diploma, Technical High School

2012 - 2015

Technical secondary education with emphasis on engineering fundamentals and practical development skills relevant to software and systems engineering.