Mark Sumi is a Software Engineer at Productic Studio who cares about the tiny moments in software, loading states, empty states, the second click that should never be needed.

He mostly lives in the frontend, and crosses into APIs when the product story requires it. He likes component systems that stay coherent under deadline pressure, and gets restless when a UI looks finished while the state model is still lying.

Outside work he takes photos of trains and pretends that counts as a hobby. On product surfaces, he wants interfaces that feel inevitable.