Asada Shinsaku

Senior software engineer focused on building real products from unclear or difficult ideas.

My background spans SaaS platforms, backend systems, full-stack development, Shopify applications, and AI-related infrastructure. I enjoy taking an idea from early design through architecture, implementation, testing, deployment, and improvement through real use.

Recently, I’ve been especially interested in AI training and software reliability. I’m currently building FaultWright, a system for creating reproducible software failures and evaluating whether AI systems can correctly diagnose and repair them.

I’m comfortable working independently, leading technical work, and turning complicated requirements into practical systems. I’m also interested in meeting thoughtful engineers, founders, and business-oriented people who enjoy experimenting with new ideas.

I’m currently looking for a US-based co-founder or close collaborator who may be interested in helping shape FaultWright’s business direction, customer relationships, partnerships, and commercialization.

Senior Software Engineer — YNS Co., Ltd.

Aug 2019 – Present

Build and maintain full-stack software systems across backend, frontend, infrastructure, APIs, and data-intensive applications.

I have taken responsibility for technical design, implementation, debugging, deployment, and coordinating development work within the team. My work has included SaaS platforms, business systems, API integrations, and complex document-management applications.

One notable project involved developing an aerospace-related document management system using Python, Rust, and modern web technologies.

Freelance Software Developer

Mar 2017 – Apr 2019

Built and maintained SaaS products, Shopify applications and storefronts, WordPress systems, backend services, and integrations for clients.

Worked directly from business requirements through implementation and delivery, which gave me early experience translating non-technical problems into working software.

Independent Project Development

Currently developing FaultWright, an AI training and evaluation system that generates controlled software failures, verifies those failures, evaluates AI-generated repair attempts, and checks whether the system actually recovers.

I handle the core engineering, architecture, experimentation, and technical development while exploring commercialization and potential collaboration.

Nihon University

Bachelor of Science in Computer Science

Sep 2019 – Mar 2023

Studied computer science fundamentals including algorithms, data structures, software engineering, databases, networking, operating systems, and application development.