Data annotation services
Data annotation and labeling services with a vetted workforce
trainee.digital is a data labeling company built as a marketplace: you post the dataset, set the price per unit, and only people who passed our scored annotation assessment can take the work. Payments are escrow-backed and release when you approve.
Annotation types we take on
| Type | Typical input | Output |
|---|---|---|
| Image segmentation and region marking | DICOM exports, JPG/PNG, TIFF tiles | Per-image masks/regions with class labels, boundary tolerance per rubric |
| Object and attribute tagging | Images, satellite tiles, video frames | Bounding boxes / tags per unit, attribute fields |
| Text classification and clause extraction | PDF, DOCX, plain text, HTML | Per-document or per-clause labels, span offsets |
| Named entity and field extraction | Scanned documents, invoices, statements | Key-value fields with page references |
| LLM response ranking and preference data | Prompt/response pairs (JSONL) | Ranked pairs with rationale codes (RLHF-style) |
| Speech transcription QA | Audio clips (WAV/MP3) | Corrected transcript per clip, error tags |
If your task is not on this list, send a 10-unit sample and the guideline draft to support@trainee.digital — we answer whether it is workable before you commit budget.
How the cost is calculated
There is no opaque quote. You choose the unit and the price per unit; the platform adds a flat 10% fee. The total is shown on the review screen before you publish.
| Line | Example order | Amount |
|---|---|---|
| Volume | 5,000 pages | 5,000 units |
| Your price per unit | $0.12 per page | × |
| Work subtotal | 5,000 × $0.12 | $600.00 |
| Platform fee | 10% of subtotal | $60.00 |
| Total funded into escrow | $660.00 |
- Higher per-unit rates attract performers faster; you set the trade-off between speed and cost.
- Premium (\u201cserious\u201d) orders can be posted with a fixed reward instead of per-unit pricing — used for specialist work.
- Funding is by bank transfer request from the client dashboard; the request is recorded with a pending status until reconciled.
Volumes, formats and delivery
- Batch size: orders on the platform today run from a few hundred to several thousand units; larger programs are split into milestones so review stays manageable.
- Input: you host the source data and share access (e.g. a link to a bucket or folder) — we do not require uploading your dataset to us.
- Output: labels delivered as JSON or CSV per batch, plus the annotator notes on flagged units.
- Guidelines: you supply the label set and the rubric; the order screen keeps them attached to every unit, and the minimum accepted quality score is stated in the order.
- Anonymisation: sensitive data (e.g. medical scans) must be anonymised before it reaches the platform — see our Privacy Policy.
Escrow-backed milestone payments: how money moves
- You fund the order before work starts. Funds sit in escrow on the platform and are not paid to performers at that moment.
- Work is delivered per milestone. You review the delivered batch against the order guidelines.
- Funds release only when you approve the milestone. If you reject it with a reason, the batch is reworked or the milestone is cancelled and the escrowed amount stays with you.
- Performer balances become withdrawable after approval. Minimum withdrawal is $100; requests are processed manually with the payout details the performer submits.
- Disputes follow our Dispute Resolution process: email first, then a review of the submission, order requirements and platform records.
Quality control on our side
Every performer who can accept your order has passed a scored 50-unit assessment reviewed by a person, with a 70% passing bar on accuracy, consistency and completeness. Vetting is one attempt and cannot be skipped — the order feed is locked until it is passed.
FAQ from clients
What is the turnaround?
It depends on the rate and volume you set: the order carries your own deadline (open orders today run 4–10 days for 800–3,000 units). We do not promise a delivery date the market cannot meet — if a batch is not picked up, raise the per-unit rate or reduce scope.
Do I pay before seeing any work?
You fund escrow before work starts, but funds release only when you approve a milestone. Rejected work is reworked or the milestone is cancelled and the escrowed amount stays with you.
Can I run a paid pilot first?
Yes — post a small order (a few hundred units) with the same guidelines. That is the honest way to measure our quality on your data.
Who are the annotators?
A vetted crowd, entry-level to expert. Everyone passes the same assessment; specialists are additionally routed to premium orders.
What about NDA and data handling?
Write to support@trainee.digital with your requirements before posting. Data you host stays with you; we store the labels and order metadata.
Contact and who runs this
trainee.digital is operated by NGO "ElectronNick" (EDRPOU 4480186765007), registered in Odesa, Ukraine. Written questions about orders, assessments, payouts or invoices: support@trainee.digital. We reply within 1–2 business days. See also our Terms of Service, Privacy Policy and Dispute Resolution process.