Train smarter modelswith vetted human expertise

Index.dev provides the STEM specialists, RLFH experts, red teamers, ML engineers, annotators, and evaluators you need to train, fine-tune, and deploy your AI. From early-stage data prep to production-ready models, we help you handle the entire lifecycle.

Hire AI training talent

Graduates from MIT, Stanford, and Berkeley

Talent across 50+ countries, fluent in multiple languages

Identity-verified, live-proctored, and credential-checked

Speed

~7 days average from brief to deployed team, drawing from a 2.5M+ pre-screened talent database

Depth

7,000+ vetted AI, STEM, and domain specialists trained across RLHF, RAG, LLMs, agents & evals

Quality

97% first-match success rate with specialists experienced across 20+ AI training domains

Scale

Start with one specialist or build a full team, with flexible support as your AI projects grow

Trusted by AI labs and enterprise teams building the next generation of AI

Why index.dev

The benchmark for high-stakes AI training

Vetted talent. Real domain depth. A team that scales with your model.

98%+ annotation accuracy

40–60% cost savings vs. local hires

No deposit or placement fees

2-week risk-free trial

Real STEM depth

Our specialists have genuine academic and practical backgrounds: mathematics, physics, biology, computer science. Many studied at MIT, Stanford, Berkeley, and CMU — with the practical AI experience to match.

Quality you can audit

We maintain a strict 98%+ accuracy rate on all annotation and evaluation tasks. Every output is traceable to a verified expert, with inter-rater reliability reported weekly so you never have to guess about data quality.

Multilingual capability

Our network spans 50+ countries. If you need training data in Italian, Spanish, German, or another language, we have native speakers who understand the context, not just the words.

Regulated industry expertise

Our specialists have worked in healthcare, finance, legal, and defense. They know how to handle sensitive data and understand what’s at stake when outputs go wrong.

Results from teams shipping AI today

"Improved eval accuracy by 32%"

"Index.dev brought in evaluators who quickly spotted gaps our internal benchmarks missed. The quality of feedback was much stronger than what we'd seen before."

Head of Model Evaluation

AI Research Lab

"Reduced our fine-tuning cycle by 40%"

"The ML engineers we brought in from Index.dev optimized our training pipelines. They caught a memory leak in our distributed training setup that had been slowing us down for weeks. Wish we'd done it sooner."

VP of Engineering

Robotics & Embodied AI Lab

"Scaled expert RLHF teams in under 2 weeks"

"Finding people who can evaluate complex math at the PhD level is nearly impossible. Index.dev filled that gap fast and helped us reach a level of model maturity we couldn't hit on our own."

Lead Researcher

Frontier AI Lab

Engagement models

Clear terms, dedicated team, weekly reporting.

We work through structured, flexible engagements for AI training, so you always know the scope, the team, and how progress is tracked.

Predictable pricing

Monthly retainers with a defined contract scope. You know exactly what you're getting and what it costs.

Dedicated teams

We build a training pod around your specific domain and needs — with a program manager handling QA and delivery.

Full visibility

Weekly reports on throughput, accuracy, and inter-rater reliability. You can see exactly how every specialist is performing at any time.

Most engagements run 3–12 months. Pricing scales with team size, domain complexity, and SLA requirements.

Get a tailored quote

1 in 100

Only the top 1% of STEM and AI applicants make it into our network.

~7 days

From first call to your new specialist ready to start.

97%

First-match success rate across client engagements

Ready to scale your training pipeline?

Get the right expertise to move your AI from a research experiment to a production-ready system.

Book a 15-min call