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Integrations / Your Custom Tool

Hire Expert AI Trainers & Data Labelers for Your Internal Tool

Built your own annotation, evaluation, or training platform? Bring experienced talent into your systems. Connect with 100,000+ pre-vetted specialists who can learn your workflows and start contributing fast.
Post a Custom Tool Job Large Project? → Managed Service
Trustpilot
Flow diagram showing a Custom Tool job posted through OpenTrain, passing through screening and vetting, and resulting in a curated shortlist of AI Trainers and AI Data Labelers for the client’s own tool. OpenTrain proposals view listing pre-screened AI Trainers and AI Data Labelers with “Invite to Custom Tool” buttons to add them into the client’s internal labeling platform.
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Post a Job Now
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Hire Pre-Vetted Experts
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Chat & Manage Work
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Talent Network

The #1 Talent Network for AI Training and Data Labeling

100,000+ pre-vetted AI Trainers and Data Labelers across 130+ countries
Annotators, evaluators, QA reviewers, prompt engineers, domain experts, and more
Specialists in healthcare, autonomous driving, manufacturing, life sciences, retail, finance, legal, and more
Post a Custom Tool Job Large Project? → Managed Service
Card with “Post a Custom Tool Job” and a row of profile photos labeled 100,000+ pre-vetted experts on OpenTrain. OpenTrain lets you hire AI Trainers and Data Labelers into any data labeling tool, including your own custom software. Abstract image of half-globe, half-brain sphere.
OpenTrain custom tool project view showing shortlisted freelance specialists from clinical research, law, math, and safety roles with an “Invite to your Custom Tool workspace” button.
Why OpenTrain

The Easiest Way to Staff Your AI Data Projects

Every candidate is vetted through AI-powered screening and interviews before being matched to your job. You get a shortlist of qualified talent ready to learn your systems and start contributing immediately.
Candidates are screened for adaptability, domain expertise, and the specific skills your projects need
Invite your hires to your internal tool using whatever access method you already have in place
Your data stays in your environment, and OpenTrain never requires access to your systems
Post a Custom Tool Job Large Project? → Managed Service
How It Works

One Place to Hire and Manage Your Annotation Team

OpenTrain brings hiring, communication, and payments together in one place while your team works inside your internal systems.
Post a Custom Tool Job Large Project? → Managed Service

Post a Job

Create an account and post your first job in minutes. Describe your project requirements, set your rate, and start receiving proposals from qualified candidates.
Post a Custom Tool Job
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OpenTrain screen showing a “Custom Tool Project” card with progress bar, description, and settings fields used to post a labeling job for an internal tool.

Review Pre-Vetted Proposals

Every candidate is screened through AI-powered vetting and interviews before being matched to your job. Review your shortlist, message candidates, and choose the best fit.
Post a Custom Tool Job
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OpenTrain proposals board for a Custom Tool job showing freelance AI Trainers and AI Data Labelers from clinical research, law, and math backgrounds with Message and Shortlist buttons.

Hire and Add to Your Tool

Once you've selected your hires, invite them to your internal tool using whatever access method you have in place. Your existing workflows and data stay exactly as they are.
Post a Custom Tool Job
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OpenTrain Custom Tool hiring flow showing shortlisted freelancers on the left, a central Hire step, and an “Invite to Custom Tool” button connecting them to the client’s internal platform.

Communicate and Manage Work

Use built-in chat and a collaborative instruction editor to keep annotation guidelines current and projects organized.
Post a Custom Tool Job
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OpenTrain custom tool project view with group messaging on the left and project instructions on the right used to coordinate freelancers while they work in the client’s own tool.

Pay Securely in One Place

Handle global payments from a single dashboard. No chasing invoices or juggling multiple payment methods.
Post a Custom Tool Job
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OpenTrain payment dashboard for a Custom Tool project showing escrow balance, approved payments, pending approval, and payout buttons for hired AI Trainers and AI Data Labelers.
Get Started

Start Building Your AI Training Team Today

Post your first job and connect with experienced AI Trainers and Data Labelers ready to work in your custom data labeling tooling. From computer vision to LLM training, most teams make their first hires within a week.
Post a Custom Tool Job Large project? Get a quote
OpenTrain hiring dashboard for a custom tool project showing shortlisted freelance AI Trainers and AI Data Labelers with options to message, hire, or invite them into the client’s own tool workspace.
Solutions

Find Talent For Any AI Data Need

LLM & Agents
Find vetted domain experts to train and evaluate your LLMs, driving higher quality and more reliable model behavior.
Agent Simulations
Code Generation Review
Computer Use Agent Training
Function Calling
Hallucination Audits
LLM Evaluation
Multilingual AI Training
RL Environment Design
RLHF & Preference Data
Reasoning Problem Creation
Reasoning Step Verification
Red Teaming
Supervised Fine-Tuning
View All LLM & Agent Solutions
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Structured Data Labeling
Hire experienced annotators to deliver precise, consistent labels at scale across vision, text, audio, and 3D.
Document Annotation
Image Annotation
Medical Imaging Annotation
Point Cloud Annotation
Satellite Imagery Annotation
Segmentation
Speech and Audio Labeling
Text Annotation
Time Series Annotation
Video Annotation
View All Data Labeling Solutions
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Process

How OpenTrain Works With Your Custom Tool

Hiring for AI training and data labeling projects used to be slow and scattered. With OpenTrain, you can have qualified talent working in your custom tooling within days.
01
Post Your Job and Receive Pre-Vetted Proposals
Create an account, describe your project requirements and the expertise you need, and start receiving proposals from qualified candidates.
02
Hire and Add to Your Tool
Review candidates, make your hires, and invite them to your internal systems using whatever access method you have in place.
03
Manage and Pay in One Place
Message your team, share guidelines, track progress, and handle global payments from a single dashboard.

Post Your Custom Tool Job Now

Create an account and start receiving proposals in minutes.
Post a Custom Tool Job

Large Project? We Can Help.

Get a dedicated team managed end-to-end, working inside your custom tooling.
Get a Managed Service Quote
FAQ

FAQs About Hiring for Your Custom Tool

Common questions about finding and managing talent for your custom data labeling or evaluation software.

Use whatever access method you already have in place. OpenTrain doesn't require integrations or access to your software. Once you've made your hires, add them to your tool the same way you would any new team member.

Our network includes specialists for computer vision, LLM training, evaluation, RLHF, prompt engineering, data annotation, QA review, and more. Just describe your requirements when you post your job.

Yes. Many of our AI Trainers and Data Labelers have worked across commercial tools, open-source platforms, and custom-built software. They're used to learning new interfaces and workflows quickly. Include your requirements in your job post and we'll match you with adaptable candidates.

No. Your data stays in your environment. OpenTrain handles hiring, communication, and payments only. We never access your custom tool or project data.

OpenTrain charges a platform fee on top of what you pay your talent. You set your own rates and pay only for completed work. No subscriptions or minimums.

Managed Service is for teams that need a dedicated workforce without handling recruiting, onboarding, and QA themselves. We manage end-to-end operations inside your custom tool for large or ongoing projects.

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.
Create Account & Post a Job
Managed Service
For Large Projects
Done-for-You
We recruit, onboard, and manage a dedicated team inside your tools. End-to-end operations for large or complex projects.
Learn About Managed Service
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.
Join Now