Marsel Bait

About

Hello, I'm Marsel.

A product and brand designer in Tokyo. I ship bilingual UI/UX and the tools AI agents use.

Marsel Bait at a cafe in Tokyo

Indonesian and Filipino, based in Tokyo

I have lived between cultures my whole life. Raised in Jakarta, design school in Manila, then a master's in Tokyo. Working across English, Bahasa, Filipino, and Japanese teams made bridging languages second nature, and it is why I tend to own the English voice on bilingual products.

Solo, and end to end

For seven years, four of them in product, I have worked from research through to the shipped front end: information architecture, UI, design systems, brand, and print. Four years on one bilingual platform taught me depth. Multi-domain client work taught me range.

I build the tools AI runs on

My personal work is open-source AI tooling. I ship MCP servers that agents call directly, so I am not only a designer who uses AI, I design what the AI itself runs on. Seven are live on npm today.