Hire Freelance Data Labelers & AI Trainers from the #1 Talent Network
Post a job, review pre-vetted candidates, and deploy them into any annotation platform. 10% marketplace fee, no long-term contracts.
723,000+ people in our network
AI Trainers & Data Labelers
Works With Every Annotation Platform
Everything You Need to Hire and Manage Data Labeling Teams
Source freelancers, screen candidates, deploy into your tools, and handle global payments - one platform, no vendor lock-in.
Talent Matching
Post your requirements. Review only qualified matches.
Post once and receive a shortlist of domain experts matched to your project. Our AI screens resumes, runs skill tests, and holds AI interviews so you never wade through unqualified applications.
Any Platform
Bring vetted talent into any tool you use.
Deploy experts into any third-party platform, any open-source tool, or your own custom annotation environment. No vendor lock-in, no platform migration.
Built-In Workspace
Chat, docs, and project management. All built in.
Centralize team communication, share instructions, assign training modules, and track progress. No need for separate tools.
Global Payments
Pay talent directly. Flat fee. No hidden markups.
Pay securely across 240+ countries. You see exactly what talent earns and what the marketplace fee is. No bundled software charges, no surprise costs.
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 many languages.
LLM & Agents
Hire vetted domain experts to train and evaluate your LLMs, driving higher quality and more reliable model behavior.
LLM Evaluation 
Red Teaming 
Hallucination Audits 
RLHF & Preference Data 
Supervised Fine-Tuning 
Code Generation Review 
Function Calling 
Computer Use Agent Training 
Reasoning Step Verification 
Multilingual AI Training 
Reasoning Problem Creation 
Agent Simulations 
RL Environment Design Data Labeling
Hire experienced annotators to deliver precise, consistent labels at scale across vision, text, audio, and 3D.
Document Annotation 
Image Annotation 
Segmentation 
Video Annotation 
Text Annotation 
Speech and Audio Labeling 
Time Series Annotation 
Point Cloud Annotation 
Medical Imaging Annotation 
Satellite Imagery Annotation Start Hiring AI Trainers & Data Labelers Today
Post a job and hire self-service, or let our team recruit and manage your workforce end-to-end.
Hire Experts Yourself
- Shortlist of tested experts
- You set rates, schedules, and guidelines
- Pay talent through OpenTrain
Full-Service, End-to-End
- Recruiting & live vetting
- Onboarding & training
- Daily management & QA
- Dedicated program lead
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 723,000+ People
Define your requirements and go live in minutes. Your job reaches the people in our global network. 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.
Hiring AI Trainers & Data Labelers - FAQ
Common questions about finding, vetting, and managing freelance AI training and data labeling talent on OpenTrain.