ML Lead / Founding Engineer
Trace fit to your training pipeline
What they get → Filter by language, difficulty, and engineer tier
For teams training AI coding tools
A catalog of senior-engineer recordings, ready to license.
Filter by language, difficulty, and engineer tier. License one recording or a bundle. Sign up for early access.
manifest · v1.0.0live verifier
{
"manifest_id": "0x7af2…3e1c",
"trace_id": "trc_01HXY8F4KZ5N3M2",
"supplier_tier":"T1",
"content_hash": "sha256:8bc4…aa17",
"issued_at": "2026-05-07T14:02:11Z",
"license": "standard",
"signature": "ed25519:9e2f…b41c"
}Awaiting signature
Ed25519 · key local-ed25519-5ddc8a67
Canonicalized with RFC 8785 JCS, signed with the platform key published at /.well-known/manifest-keys.json.
Filter by languageEngineer tier shownAI-graded qualityPer-recording licenseBundle discountsSigned certificate per licenseRefunds within 7 daysU.S. supply, GDPR-cleanFilter by languageEngineer tier shownAI-graded qualityPer-recording licenseBundle discountsSigned certificate per licenseRefunds within 7 daysU.S. supply, GDPR-clean
How it works
Verify. Capture. License.
One pipeline, three checkpoints, one signed artifact at the end.
Verify the engineer
Every supplier passes identity, employer, and seniority checks before they can record. Their tier (Senior, Staff, or Principal) is shown on every listing — no mixing junior and senior recordings together.
Capture real reasoning
Senior engineers record themselves solving real coding problems — screen, voice, and the final code. Every recording is AI-graded for clarity and soundness before it lands in the catalog.
License with a paper trail
When you buy, we sign the license with our cryptographic key and publish the signature so anyone can verify it. Your legal team gets a defensible paper trail; your model gets training data with a known origin.
The state of AI training data
Three forces are reshaping the supply of usable data.
Each one closes a familiar shortcut. Together they raise the bar on what a defensible corpus looks like — and on the buyers who can ship one.
- Force 01
Code scraped from public repos carries lawsuit risk and no clear license chain you can show in court.
- Force 02
AI-generated training data can't replicate the real-world failure modes your model has to learn from.
- Force 03
Other data vendors mix junior and senior engineers without telling you. We show the engineer's tier and the quality grade on every listing.
What you get
Find the exact senior-engineer reasoning your AI model needs to learn from — and license it with a signed certificate you can prove in court.
Engineer tier (Senior, Staff, or Principal) is shown on every listing. Quality is AI-graded and the score is published. The license PDF embeds a signed hash that lets you verify the recording hasn't been tampered with.
Frontier AI teams are filling their training-data shelves first, and the supply of verified senior engineers willing to record is bounded.
Built for your team
Answers for the four people who sign the contract.
Procurement at an AI coding lab needs four nods. Here's what each one gets from ExpertMint.
Head of Data
Quality grading, tier disclosure, sample volume
What they get → Engineer tier and AI-grade score per listing
General Counsel
Defensible license chain on every recording
What they get → Signed certificate per license with a public verification key
Procurement
Per-recording control, no commitment, refunds
What they get → Pay per trace or by bundle, refunds within 7 days
Pricing
License a trace, a corpus, or an exclusivity window.
- $500 single recording
- $4,500+ curated bundle
- Exclusive license
Standard
License a single trace. Signed manifest, license PDF, immediate access after checkout.
$500/ trace
Browse traces →Curated corpus
Discounted bundle pricing on a curated set you select. Same provenance guarantees, single line-item invoice.
From $4,50010-trace bundle
Build a bundle →Exclusive license
Time-bound exclusivity on selected traces, plus right-of-first-refusal on net-new captures in your domain.
Talk to us
Email founders →Pick the trace shape your model needs.
Filter the catalog, license what fits, and ship a corpus your legal team can defend in deposition.