Ramp
Worked with the Ramp team on finance automation, from invoice processing and expense tracking to multi-level approvals and one clear view of company spend.
- FinTech
- Expense Management
- Financial Workflows

Senior Full-Stack Software Engineer
I’ve spent the past 9+ years building software, mostly with startups and small teams. I’ve always enjoyed the early days most — when ideas are still taking shape and there’s a lot to figure out.
These days, I work as an independent engineer, helping founders and teams solve tricky problems and turn good ideas into real products. Always happy to chat, especially over coffee.
Products I’ve helped build as a contract engineer.
Worked with the Ramp team on finance automation, from invoice processing and expense tracking to multi-level approvals and one clear view of company spend.
Collaborated with the Krea team on a generative AI workspace that brings image and video models together with real-time editing.
Worked with the Fin team on AI customer support that answers routine questions from a knowledge base and hands off to people when needed.
Collaborated with the Photoroom team on AI product photography: background removal, generated scenes, and batch editing for online sellers.
Worked with the Gumloop team on AI workflow automation, connecting apps, agents, and APIs with human approvals and live run monitoring.
Collaborated with the Tellescope team on healthcare operations: online scheduling, digital intake, secure messaging, and care coordination.
Where I’ve been building, from restaurant tech to AI.

2025–Now
Independent·International startups
End-to-end SaaS features, LLM workflows, and integrations for early-stage teams.

2022–2024
Karakuri·AI customer support
Led AI support APIs, agent handoff, and LLM reply suggestions.

2021–2022
Kaminashi·Frontline operations
Turned paper inspections into digital forms, approvals, and reports.

2018–2020
Rakuten·E-commerce and payments
Built order and payment APIs that handle retries safely.

2017–2018
Toreta·Restaurant reservations
Built reservation tools and POS integrations for restaurant staff.

2013–2017
Kyoto University·Education
Notes from building software with small teams.