Project Archive
Products, backend systems, and practical experiments.
A curated set of personal builds where I test product ideas, ship reliable infrastructure, and document real trade-offs from delivery.
Backend-first Production-minded
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Finance
Zaisei
Open sourceA personal finance platform built around how you actually think about money — not how apps want you to.
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Healthcare
Careflow
PaidA clinic operations platform that ties together patients, appointments, prescriptions, billing, and staff under one roof.
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Education
Gakuin
PaidA complete, multi-tenant school operating system — admissions, students, timetables, attendance, grades, fees, and parent portals in one platform. Version one is shipped end to end.
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