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.
Researcher Tools
Paper Explorer (HFEPX)
Browse high-signal papers for RLHF, human feedback datasets, and LLM/agent evaluation workflows.
Paper2Code Finder
Find the best implementation and artifacts for any paper by arXiv ID, DOI, URL, or title.
AI & ML Glossary
Browse 500+ AI and machine learning terms with definitions, examples, and explanations.
Blog
Product Updates & Insights
Product updates, guides, and insights from the OpenTrain team.
Featured
AI Interviews For Every Applicant
Automated AI interviews and skills checks for every applicant so you review only exact‑fit talent.
Product Updates
December 16, 2025
Read More
AI Interviews For Every Applicant
Automated AI interviews and skills checks for every applicant so you review only exact‑fit talent.
Product Updates
December 16, 2025
How To Staff LLM Evaluations At Scale
A practical framework for staffing reliable human evaluations for LLMs.
Guides & Playbooks
September 8, 2025
Multilingual Evals: Pitfalls And Playbook
How to plan coverage, avoid translation traps, and calibrate bilingual evaluators.
Research & Insights
September 8, 2025
Sourcing RLHF Preference Data That Works
Tactics for recruiting domain‑expert raters and producing high‑signal preference data.
Guides & Playbooks
September 8, 2025
What Drives Agreement In LLM Evaluations
Findings on rubric clarity, domain expertise, and training prompts that raise agreement.
Research & Insights
September 8, 2025
Managed Programs With SLA Options
Choose throughput and response‑time SLAs for managed programs with dedicated PM support.
Product Updates
September 8, 2025
OpenTrain Reaches 100,000+ Trainers Across 130 Countries
Our global talent network now spans 130 countries and 70+ languages.
Company News
September 8, 2025
Hire Experts For Any Tool: New Integrations Hub
Browse tools and hire pre‑vetted experts who already know your stack.
Company News
September 8, 2025
How To Pass The OpenTrain AI Interview
Tips to prepare your profile and ace the AI interview used in project screening.
Freelancer Tips
September 8, 2025
Level Up Your Portfolio: RLHF, Evals, And Labeling Samples
What hiring teams want to see in portfolios for RLHF, evals, and annotation work.
Freelancer Tips
September 8, 2025
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.