Platform Overview
Hire, manage, and pay top AI Trainers & Data Labelers in one place while working in the tools you already use
Find Data Labeling Vendors
Browse vetted agencies and BPOs for large-scale projects.
List your data labeling company
Create a free company profile, receive matched RFPs, and submit proposals with your pricing, capacity, and timeline.
JOIN AS Freelancer
The #1 Platform for Finding AI Training Jobs
We bring AI training and data labeling jobs from 20+ platforms into one place.
Work With Us
Hire Freelancers
Post a Job to the #1 Network for AI Training Talent Now
Post your job and find pre-vetted AI Trainers & Data Labelers across any domain, language, or tool.
FOR LARGE PROJECTS / MANAGED SERVICE
Done-for-You AI Data Teams
For large or complex projects. We recruit, train, manage, and QA your team inside your tools.
JOIN AS Freelancer
The #1 Platform for Finding AI Training Jobs
We bring AI training and data labeling jobs from 20+ platforms into one place.
LLM & Agents
View All LLM & Agent Solutions
Structured Data Labeling
View Data Labeling Solutions
Work With Us
Hire Freelancers
Post a Job to the #1 Network for AI Training Talent Now
Post your job and find pre-vetted AI Trainers & Data Labelers across any domain, language, or tool.
FOR LARGE PROJECTS / MANAGED SERVICE
Done-for-You AI Data Teams
For large or complex projects. We recruit, train, manage, and QA your team inside your tools.
Work With Us
Hire Freelancers
Post a Job to the #1 Network for AI Training Talent Now
Post your job and find pre-vetted AI Trainers & Data Labelers across any domain, language, or tool.
FOR LARGE PROJECTS / MANAGED SERVICE
Done-for-You AI Data Teams
For large or complex projects. We recruit, train, manage, and QA your team inside your tools.
Solutions / LLM & Agents
Hire Experts for LLM & Agent Training
Stand up reliable human loops fast. Post once, get a curated shortlist of domain-matched experts, and run work inside your stack with clear quality targets and simple cost-plus pricing.
LLM Evaluation
Golden datasets, pairwise ranking, rubric scoring, judge validation, and more
Red Teaming
Jailbreaks, prompt injection, policy bypass, data leakage, and more
Hallucination Audits
Claim verification, citation checking, severity scoring, and more
RLHF & Preference Data
Pairwise ranking, multi-criteria scoring, rewrites, failure tagging, and more
Supervised Fine-Tuning
Instruction data creation, domain verification, synthetic data QA, and more
Code Generation Review
Verification, RLHF ranking, bug detection, security review, and more
Function Calling
Tool selection, argument annotation, multi-step traces, error recovery, and more
Computer Use Agent Training
Trajectory data and evaluation for browser and desktop agents
Reasoning Step Verification
Step-level correctness labels for training process reward models
Multilingual AI Training
Native-speaker RLHF, evaluation, prompt writing, and more across 100+ languages
Reasoning Problem Creation
Original problems with step-by-step solutions in math, code, and more
Agent Simulations
Scenario design, gold trajectories, rollout evaluation, failure tagging, and more
RL Environment Design
Reward functions, training scenarios, and environment QA for RL agents
Talent Network 
Find the Human Experts You Need for LLM and Agent Training
OpenTrain connects you with pre-vetted specialists for LLM training, evaluation, and agent workflows. Post a job, get a curated shortlist, and hire directly into your tools.
100,000+ pre-vetted experts across 130 countries and 70+ languages
AI matching with screening and interviews tailored to your LLM & Agent project
Deep domain coverage: technical, scientific, medical, legal, safety, and creative
Get Started
Start Hiring from the #1 AI Training Network
Create your account and reach 100,000+ pre-vetted specialists for LLM training and agent workflows. Review your shortlist, hire into your tools, and pay with simple, transparent fees.
Process
How OpenTrain Works
Post a job, hire pre-vetted specialists, and start LLM or agent training work in days.
01
Post Your Job. Get Qualified Candidates.
Describe your LLM or agent project and requirements. Our AI matches you with specialists from the network, then screens resumes, tests skills, and runs interviews. You get a shortlist of qualified candidates ready to hire.
02
Hire and Integrate Into Your Tools
Hire directly and invite your team into any evaluation harness, prompt hub, code repo, or custom environment. You keep full control over setup and workflow.
03
Manage Work and Pay in One Place
Use one workspace for messaging, instructions, training materials, progress tracking, and secure payouts. Production moves faster when everything is in one place.
Post Your LLM or Agent Job Now
Create an account, post your role, and get matched with qualified specialists from 100,000+ experts. Hire directly into your tools.
Post a Job Large Project? Try Managed Service
For large or complex work, we recruit, onboard, manage, and QA a dedicated team inside your tools.
Managed Service Get Started
Join the #1 Platform for AI Training Talent
Where top AI builders and expert AI Trainers connect to build the future of AI.
Self-Service
Post a Job
Post your project and get a shortlist of qualified AI Trainers and Data Labelers. Hire and manage your team in the tools you already use.
Managed Service
For Large ProjectsDone-for-You
We recruit, onboard, and manage a dedicated team inside your tools. End-to-end operations for large or complex projects.
For Freelancers
Join as an AI Trainer
Find AI training and data labeling projects across platforms, all in one place. One profile, one application process, more opportunities.