Simple, Transparent Pricing
Post jobs for free. Pay only when you hire. No per-task software fees, no bundled markups, no contracts or minimums.
Post a job, review a curated shortlist, hire and manage talent directly in your tools.
We recruit, vet, onboard, train, and manage your team with quality assurance.
Argilla
V7 Darwin
Scale Studio
Encord
Snorkel AI
Label Studio
SuperAnnotate
CVAT
Roboflow
Kili Technology
AWS SageMaker
Dataloop
SuperviselyArgillaV7 DarwinScale StudioEncordSnorkel AILabel StudioSuperAnnotateCVATRoboflowKili TechnologyAWS SageMakerDataloopSuperviselyArgillaV7 DarwinScale StudioEncordSnorkel AILabel StudioSuperAnnotateCVATRoboflowKili TechnologyAWS SageMakerDataloopSuperviselyArgillaV7 DarwinScale StudioEncordSnorkel AILabel StudioSuperAnnotateCVATRoboflowKili TechnologyAWS SageMakerDataloopSuperviselyPost a Job, Hire Experts Into Your Tools
Describe your requirements and go live in minutes. Review a curated shortlist of domain experts matched to your project. Hire them directly into whatever annotation tools your team already uses.
- Post unlimited jobs for free. Pay only when you hire.
- 15% flat fee on payments to talent. No per-task software charges.
- AI-matched shortlist of pre-vetted domain experts for every role
- Invite hires directly into Label Studio, CVAT, Argilla, or any annotation tool
- Built-in workspace: messaging, instructions, and milestone payments
- You set the rates, schedules, and guidelines. Full control.
Full-Service, End-to-End Team Management
We handle everything: recruiting, live vetting, onboarding, training, daily management, and quality assurance. Your dedicated program lead operates inside your tools so your data never leaves your environment.
- Cost-plus 20% management fee. Replaces the 15% self-service fee.
- We source, vet, and onboard your team with live proctored testing and interviews
- Dedicated program lead runs your project day-to-day
- Ongoing QA, performance management, and regular reporting
- Operates inside your tools with your guidelines. We never touch your data.
- Flexible scope: recruiting only, full ops, QA only, or anything in between
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.
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 Everything You Need to Know
Common questions about working with OpenTrain.