Head of Data
Reasoning quality, tier mix, delivery cadence
What they get → Engineer tier and AI-grade score on every recording
Training data for AI coding tools
AI training data, recorded by real senior engineers.
Senior engineers record themselves coding. AI labs license the recordings to train smarter models. Sign up for early access to the catalog.
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.
Senior-engineer tiersCryptographic provenanceSigned at deliveryAI-graded for qualityIdentity-verified suppliersEncrypted storageLicense PDF + signed certificateU.S. supply, GDPR-cleanSenior-engineer tiersCryptographic provenanceSigned at deliveryAI-graded for qualityIdentity-verified suppliersEncrypted storageLicense PDF + signed certificateU.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
Public code scraped from the internet carries lawsuit risk — courts are tightening fair-use limits and you need a defensible source.
- Force 02
AI-generated training data hits a ceiling on hard problems where a real senior engineer's judgment still wins.
- Force 03
Hiring contractors through Mercor or Surge sells engineer hours — but you can't re-license what you bought, and you can't prove where it came from.
What you get
Recordings of senior engineers solving real problems, ready for AI training, with a signed certificate of where every recording came from.
Every recording is by a credential-checked senior engineer — we verify their identity, their employer, and their seniority before they can record. Every license is cryptographically signed by ExpertMint, and the verification key is published publicly so you can prove the chain of custody on day one.
AI coding tools are running out of clean public data to train on. The teams sourcing real engineer reasoning now will lead the next wave.
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.
Chief Scientist
Trace structure, methodology, signal-to-noise
What they get → Manifest schema, grading rubric, per-tier samples
General Counsel
Defensible chain-of-custody, license terms
What they get → Cryptographically signed license with a public verification key
CFO / Procurement
Predictable spend, MSA, net-30 invoicing
What they get → Pilot-to-subscription path with quarterly refresh
Pricing
Three ways in. One signed bundle out.
- $5K lighthouse pilot
- $25–50K corpus extension
- Quarterly refresh
Sample bundle
Browse the catalog and license one trace at a time — standard license, signed manifest, no commitment.
$500/ trace
Browse traces →Lighthouse pilot
Hand-curated T1 traces in your domain. Two-week delivery. Signed manifest bundle. Built for first-pilot procurement.
$5,00010 traces
Request a pilot →Custom corpus
Volume-priced, domain-targeted corpora with negotiated exclusivity. Quarterly refresh available.
Talk to us
Email founders →Your training run starts with one signed bundle.
Lighthouse pilots are sized for procurement: ten T1 traces, two-week delivery, signed manifest bundle.