The #1 Talent Network for AI Training & Data Labeling
Hire tested domain experts matched to your project, and put them to work in the tools you already use. Built for AI labs, AI companies, and data companies. Self-serve or fully managed.
For AI Labs & Companies
Self-service: 10% of what you pay talent, plus $9.95 per new contract. Managed service: 20%.
For Freelance AI Trainers
From Job Post to Deployed AI Training Team
Post your RLHF, evaluation, or annotation project. Get a pre-screened shortlist of domain experts. Deploy them directly into your annotation tools.
Post Your Job to 678,000+ Experts
Define your requirements and go live in minutes. Your job reaches our global network of pre-vetted AI Trainers and Data Labelers. No sales calls, no minimums.
- Guided job form: specify domains, languages, seniority, and tools
- Published pricing: 10% marketplace fee + $9.95 new-contract fee
Every Candidate Screened, Tested, and Scored
Our matching system draws on performance data from across 20+ AI training platforms. Every applicant goes through AI interviews and skill testing before they reach your shortlist. Candidates matched on proven ability, not self-reported skills.
- Unified work history: real ratings and performance data from 20+ AI training platforms
- AI interviews that test domain knowledge and reasoning before candidates reach you
- Domain-specific skill assessments calibrated to your project requirements
Hire & Deploy Into the Tools You Already Use
Hire from your vetted shortlist and add experts directly into whatever annotation tools your team already uses. No migrations, no vendor lock-in.
- Works in the annotation tools your team already uses, such as Label Studio, CVAT, Labelbox, and Argilla
- Send offers and onboard hires without switching platforms or migrating data
Manage Work and Pay Your Team Directly
Keep your entire project in one place. Update guidelines, coordinate with your team, and handle payments without juggling external tools. Set your own rates and pay talent directly through OpenTrain.
- Edit and publish instructions that reach your entire team instantly
- Chat, training modules, and progress tracking in one workspace
- Pay per hour, per task, or fixed price. 10% marketplace fee plus $9.95 when a new contract starts.
Hire Top Talent for Any AI Training Need. Any Domain, Any Scale.
From RLHF and red teaming to image annotation and multilingual evaluation. Pre-vetted domain experts and skilled annotators ready to work inside your tools.
Post-Training & Alignment
RLHF preference ranking, DPO pair generation, and reward model training data. Our experts evaluate and rank model outputs so your models learn what good looks like.
Reasoning & Verification
Expert evaluation of chain-of-thought reasoning, process reward annotation, and verification of math, code, and logic outputs.
Red Teaming & Safety
Adversarial prompt crafting, jailbreak discovery, bias evaluation, and safety alignment testing.
Domain Expert Annotation
PhDs and professionals in mathematics, medicine, law, finance, and engineering providing expert-grade training data.
Evaluation & Benchmarking
Human evaluation of model outputs, benchmark creation, A/B preference testing, and ongoing quality monitoring.
Multimodal & Multilingual
Vision, audio, video, and document annotation with cross-modal alignment across 118+ languages.
Top talent from leading institutions and companies
How We Test Experts Before You Meet Them
Every applicant passes AI interviews and skill tests before they reach your shortlist. In managed programs, each specialist is also verified through live interviews and proctored testing.
The Network
Domain Experts, Not Crowd Workers
PhDs, engineers, clinicians, legal specialists, and creative professionals. Matched to your specific field, not pulled from a generic applicant pool.
Global Coverage
Fluent speakers with local context around the world. Hire locally or build distributed teams across regions.
AI-Powered Matching
Resumes screened and ranked against your specific domain, language, and skill requirements. You review only qualified matches.
We Recruit, Train, and Manage Your Team
We handle recruiting, onboarding, training, daily ops, and QA with a dedicated program lead. Every candidate goes through live human verification.
Live Proctored Testing
A human proctor watches every skills test in real-time. No cheating with ChatGPT or outside help.
Live Interviews
Trained interviewers verify domain expertise face-to-face. Not AI chatbots.
Custom Calibration
Tests and rubrics built specifically for your project. Candidates are scored against your standards.
Join 678,000+ AI Trainers & Data Labelers
Trusted worldwide on Trustpilot
“Reliable payments, easy access, and yes, Legit!”
“OpenTrain became the bridge that led me into AI training work.”
“Everything has been respectful and accorded to contract.”
“The review and payment are so quick.”
“The admin is really helpful and responsive.”
“Reliable payments, easy access, and yes, Legit!”
“OpenTrain became the bridge that led me into AI training work.”
“Everything has been respectful and accorded to contract.”
“The review and payment are so quick.”
“The admin is really helpful and responsive.”
Better Talent. Better Data. Better AI.
Get started with self-service hiring or let our team handle it end-to-end.
Hire Experts Yourself
Post a job, get a shortlist of tested experts, and pay them through OpenTrain.
Full-Service, End-to-End
- Recruiting & live vetting
- Onboarding & training
- Daily management & QA
- Dedicated program lead
Build a career training the world's top AI models.
Freelance AI Trainer?
Join 678,000+ people
Data Labeling Company?
Find clients and recruit talent
Everything You Need to Know
Common questions about working with OpenTrain.