Coming soon: Build Data + AI systems with evidence built in. Preview
About Mitari

Building verification infrastructure for Data + AI development

AI is accelerating how data pipelines, analytics, models, and intelligent systems are built. Trust is becoming the bottleneck.

Data + AI systems can execute successfully while producing invalid, misleading, or irreproducible results. A pipeline can succeed. Tests can pass. The output can look plausible. The underlying logic can still be wrong.

Mitari is building the independent verification layer around this work: infrastructure that makes intent explicit, gathers evidence from the tools teams already use, and helps determine whether a change is supported before and after it ships.

Fathom, our product available today, verifies pull requests, repositories, and submitted files. Our next product will move the same discipline upstream into local and agentic development.

The problem

Data and AI code can be confidently wrong

A join can silently double-count. A schema change can quietly corrupt a downstream table. An aggregation can drop late-arriving rows. A model can leak future information, rely on a broken assumption, or report performance that will not hold outside the development environment.

These failures span the whole stack — from the pipelines that move and transform data to the models built on top of it. They rarely look broken.

The code runs. The pipeline succeeds. The tests pass. The result is still wrong.

The failure ships and surfaces only later — as business, financial, operational, or regulatory damage.

The missing layer

Tests can only catch what someone thought to test

Tests and assertions are essential, but they primarily catch failures someone anticipated and explicitly encoded.

Data-quality tools check whether data satisfies declared expectations. General-purpose developer tools check whether code compiles, runs, and follows common engineering conventions.

The most dangerous failures often live underneath those checks: the transformation computes the wrong thing, the experiment answers the wrong question, the model learns from information it should not have, or the methodology no longer supports the conclusion.

Mitari closes that gap by judging whether the reasoning underneath the code is sound.

Few tools are built to judge whether the logic underneath Data and AI code is actually right.
How Mitari fits together

Two layers, one verification strategy

Fathom verifies Data + AI changes today. A build-with-evidence layer is coming soon to move that verification upstream — one strategy, two layers.

Build with evidence Coming soon

People and agents work with explicit intent, durable context, evaluations, and supporting evidence.

Passes the change and evidence forward
Fathom Available now

Independently verifies the change, surrounding logic, and available evidence before it ships.

Verifies Data + AI code independently
Intent Define what should be true.
Build A person or coding agent creates the change.
Evaluate Tests, harnesses, and existing tools produce evidence.
Fathom verifies Fathom independently judges the change, context, and available evidence.
Ship Approved changes move forward.
Learn Outcomes improve future development and verification.
How we build

Principles guiding the company and product

01

Execution is not verification

Code can run successfully while computing the wrong quantity, using invalid evidence, or answering the wrong question.

02

Intent must be explicit

A system cannot be meaningfully verified without understanding what it is supposed to do, under what assumptions, and within what constraints.

03

Evidence must travel with the system

Tests, evaluations, metrics, lineage, monitoring signals, and human decisions should not disappear as work moves from local development to review and production.

04

Independent judgment matters

The system creating a change should not be the only system deciding whether that change is trustworthy.

05

Integrate rather than replace

Teams should be able to keep their existing agents, tests, evaluation harnesses, data platforms, and monitoring tools. Mitari should connect and reason over their evidence.

06

Automation must earn trust

Findings and proposed changes should be inspectable, reviewable, and honest about uncertainty.

07

Every stage should improve the next

What happens during review and production should improve how future systems are built and verified.

The future of development is faster. It should also be more trustworthy.

We believe Data + AI teams should be able to move quickly without lowering the standard of evidence applied to their work. Mitari is building the infrastructure to help people and agents develop, deploy, and operate with greater speed, rigor, and confidence.

Try Fathom Preview what Mitari is building next