Who We Are

mare interno is a Japan-based analytics studio specializing in server-side tracking architecture, Same-Origin delivery, and accurate, privacy-aligned GA4 measurement.
We build fast, resilient, and cookieless-ready measurement layers for brands that rely on transparent and reliable data.

We operate at the intersection of technical implementation and analytical strategy—
a space where measurement, privacy regulation, and user experience converge.

Our Approach

Most analytics issues don’t come from tools.
They come from architecture.

That’s why we focus on:

  • Clean server-side routing (Server-Side GTM / Stape)
  • Cloudflare Same-Origin implementation
  • CookieKeeper for ITP-grade session continuity
  • GA4 event optimization with real accuracy testing
  • Safari / in-app browser behavior validation

Rather than relying on “best practices”, we validate every setup through real traffic, browser restrictions, and ITP behavior.
No assumptions. No guesswork. Accurate measurement only.

Official Partner of Stape

mare interno is an official Stape Partner — the first in Japan.
Our implementations follow Stape’s best-practice architecture to ensure
stable, accurate server-side GTM setups across various environments.
One of our client projects is also featured on Stape’s official partner page.

Our implementations cover:

  • Shopify
  • WordPress
  • HubSpot landing pages
  • Custom frontend environments
  • First-party endpoints & server-side tracking flows

This partnership allows us to deliver stable, high-accuracy server-side setups
that meet modern privacy requirements while maintaining performance and operational reliability.rver-side setups
that meet modern privacy requirements while maintaining performance and operational reliability.

Stape partner

Why We Do This

The analytics world is changing—fast.
Cookies are fading, browsers are tightening controls, and accuracy can’t be assumed.

We believe in transparent, privacy-aligned, and future-proof measurement that doesn’t rely on hacks or outdated paradigms.

Our mission is simple:

Build analytics environments that stay reliable, no matter how the web evolves.

What Makes Us Different

Deep expertise in ITP behavior, Same-Origin design, and traffic sourcing

A rare blend of engineering execution and analytical insight

Practical experience across Japanese and global traffic patterns

End-to-end ownership: architecture → implementation → verification

A philosophy of validation, not assumptions

For clients, this means:
Data you can trust, even in the post-cookie era.

About the Founder

Kenichi Uchiumi is the founder of mare interno, bringing years of experience in analytics, data-driven strategy, and measurement architecture.
With a background that spans both business strategy and technical implementation, he bridges two essential worlds:
the need for decision-ready data and the realities of today’s privacy-constrained, browser-driven environments.

His work follows a layered approach to analytics —
from foundational GA4 literacy , to server-side architecture and Same-Origin design ,
to privacy and ITP strategy , and long-horizon measurement thinking .

This layered perspective guides every project, ensuring solutions that are clear, future-proof, and technically sound.

Kenichi Uchiumi

Founder, CEO & Architect