We build our own web services.

caret0 LLC plans, builds and operates its own web services. We do not take on contract work — we run what we make, which means we are accountable for keeping it alive as a business.

What we run

Built and operated in-house
● Released

ProxyLoom

MCP proxy for multi-account workflows

Puts several clients and several SaaS accounts behind a single MCP connection. Keeping none of the relayed data is a premise of the design, not an afterthought.

proxyloom.dev →

How we operate

What we hold to
Team

No split by job function

We draw no line between an engineering side and a business side. Everyone here decides what to build and carries it through to the implementation themselves. Nothing has to be relayed between the idea and the code.

Scale

A small, senior team

Headcount is not a goal in itself. Each person covers a wide area, which keeps the distance between deciding and building short.

Independence

We decide by our own standards

We are a small company with no outside investment. No one else’s deadlines or interests bend our judgment — the only question is whether we think the thing is good. Free to think, free to build.

Quality

We answer with quality

We are not a company that can win on scale. That is exactly why we think the only way through is that the product is good once you actually use it.

Who runs it

Background

Twenty years at one of Japan’s largest tech companies. As head of the company-wide IT infrastructure division, led large-scale infrastructure and an organization of up to 50 people, supporting the business from the technical side as it grew a hundredfold from its earliest days.

Later launched a new B2B SaaS business inside that company as its product owner. The business was spun out, took on outside capital, and is still running today.

At a global Big Tech company, worked as a senior cloud application architect in the professional services division, supporting enterprise cloud application design and new business launches from the technical side.

Company information

Registered details
Legal name
caret0 LLC / 合同会社caret0
Address
Shibuya Dogenzaka Tokyu Building 2F-C
1-10-8 Dogenzaka, Shibuya-ku, Tokyo 150-0043, Japan
Representative
Atsushi Ono
Founded
September 2023
Business
Planning, development and operation of web services
Origin of the name
caret0 is ^0 — the regular expression for “starts from zero”. It stands for thinking from zero, rather than being bound by concepts that already exist.

Contact

Questions about our services, bug reports, business or press inquiries — please use this form. We read everything, and normally reply within two business days.

We use what you send only to answer your inquiry. Our reply goes to the email address you provide.