Looking for a job

Koichi Sato

@koichisato

Message

I build AI-powered web and mobile applications with LLMs, React, and Node.js.

Japan

Message

What I'm looking for

I'm looking for full-time, contract, or freelance remote-only work building AI-powered web and mobile products, especially where I can integrate LLMs, RAG, and conversational AI into production systems.

I've shipped AI-powered web and mobile applications at NovaByte Digital Labs, supporting roughly 12K monthly active users across web and mobile clients. I build conversational AI, RAG-based document search, and intelligent workflow automation directly into customer-facing products.

I design REST APIs and backend services that serve web and mobile clients from a single source of truth, while building reusable React and React Native components that improve consistency and delivery speed. At VertexWave Technologies, I developed responsive web applications and 8+ backend services serving an estimated 5K+ end users.

I enjoy turning ambiguous product requirements into clean, reusable architecture for remote, international teams.

Experience

Work history, roles, and key accomplishments

Current

Senior Full-Stack & AI Developer

Current

NovaByte Digital Labs

Jan 2025 - Present (1 year 8 months)

Architected and shipped 4 AI-powered web and mobile applications end-to-end using React, React Native, TypeScript, and Node.js, supporting roughly 12K monthly active users. Embedded LLM-driven capabilities such as conversational AI, RAG-based document search, and intelligent workflow automation into core product features.

React React Native TypeScript Node RAG Conversational AI Clean Architecture