Mariana Lungu

Data architect · Northern Virginia

I build systems that can explain themselves.

I help regulated teams build data and AI systems that can be traced, defended, and trusted after the output leaves the screen.

Why this matters

AI made output cheap. Trust is still expensive.

A system can look finished until someone asks where the answer came from, what changed, and whether it can be defended later.

01 · Answers without evidence

The answer sounds right.

But no one can show which source, prompt, model state, retrieval path, or decision rule produced it.

When to bring me in

  • 01Govern the pilot before it becomes production.
  • 02Add lineage before leaders rely on the metrics.
  • 03Set the standard before speed becomes institutional risk.

The Trace Standard

I do not trust output I cannot trace.

Before I trust a system, I look for four things. Not a screenshot. Not a promise. A record another person can inspect.

01 · Source

Where did it come from?

The evidence stays attached to the answer instead of disappearing behind the interface.

02 · Reproduce

Can it be recreated?

Another person can follow the same path and understand how the result was produced.

03 · Change

What changed?

The record shows when data, models, prompts, or rules moved after the system shipped.

04 · Uncertainty

When should it stop?

Low confidence is visible, and the system knows when a person needs to step in.

Provenance trace

Source to answer, with the record intact.

Each answer keeps its cited source, lineage, confidence decision, and audit record attached so another person can inspect the path later.

Confidence

0.91

Hash

SHA-256

Action

Review

The receipt

I built a retrieval system on federal policy documents to test the standard in working code. Every answer keeps its evidence, decision context, and audit trail.

Tests

44

Indexed passages

9,116

Citations, confidence, model context, and source hashes stay with every answer.

Inspect the system

Receipts from the work

The standard matters because the outcome does.

Field record

01

Federal data pipeline

The friction

Replication took hours, and avoidable corrections kept pulling people back into the process.

The decision

I rebuilt the path across six sources with cleaning, deduplication, classification, and indexing inside the flow.

The outcome

99.98% accuracy · 40% fewer manual fixes · hours reduced to minutes

Field record

02

Governed data platform

The friction

Audit questions were slow to answer, storage was expensive, and transformation logic was hard to inspect.

The decision

I built a medallion architecture with visible ingestion, tested transformations, and a clearer record from source to use.

The outcome

50% faster audit queries · 30% lower storage cost

Field record

03

Audit-ready retrieval

The friction

A convincing answer was not enough. The system needed to show its evidence and expose uncertainty.

The decision

I built citations, confidence checks, model context, source hashing, and a query-level audit record into the answer path.

The outcome

44 tests · 9,116 passages · 16 audit fields · SHA-256

Still life of folded linen, ceramic vessel, and a sheet of paper in soft daylight

The origin

The work that made the standard.

For nearly six years, I built inside federal data environments tied to immigration cases, benefits processing, congressional inquiries, and records that affected real people.

That work taught me that almost right is not enough. Handoffs matter. Sources matter. The record underneath the visible system decides whether anyone can trust it later.

I founded Archetype Core to bring that discipline into the AI and data systems organizations are building now. The Ferne carries the same attention into material, memory, and objects meant to last.

A four-question test

Can your system answer for itself?

Mark what is true today. Not what is planned. Not what the vendor says the platform can do.

Current record

0/4

Start with one answer your team cannot fully explain. That is usually where the real architecture work begins.

Bring me an answer you cannot defend.

Review the system