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Math & STEM

STEM PhD Expert for AI Reasoning & Evaluation

Braintrust logoOutlier via Braintrust$50–$150/hr
Remote in 8 countries

Argentina, Australia, Canada, United Kingdom, Mexico, New Zealand, Puerto Rico, United States

ContractPosted 4mo ago

The middle of its range, $100/hr, is above the $40/hr median of the Math & STEM roles open now, whose typical pay runs $35–$130/hr. How that pay moves week by week is in our research on Math & STEM work.

Half of all Math & STEM roles come down within 27.1 days of being listed, and 45.4% are still up after four weeks. This one was posted 123 days ago.

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About the role

We're hiring PhD-level experts to help train and evaluate advanced AI models. This is remote, flexible contract work where your academic expertise directly shapes how cutting-edge models reason, answer, and improve. You'll review AI-generated content in your field, identify where the model gets things right or wrong, and help raise the quality bar on technical reasoning.

This is a short-term engagement running through the end of June, with potential to extend depending on project needs.

You may contribute your expertise by

  • Assessing the factuality and relevance of domain-specific text produced by AI models
  • Crafting and answering questions related to Machine Learning and AI
  • Evaluating and ranking domain-specific responses generated by AI models

What We're Looking For

  • A PhD (completed or in final stages) in one of the following fields: Machine Learning / AI, Computer Science, Engineering, Statistics, or a closely related quantitative subdomain such as Mathematics or Physics
  • Strong analytical and critical-thinking skills, with the ability to spot subtle errors in technical reasoning
  • Fluent written English and the ability to communicate complex ideas clearly

Nice to Have

  • Research experience (academic or industry)
  • Prior experience with data annotation or AI model evaluation
  • Experience reviewing or publishing research papers

Compensation

Up to $150/hr , depending on your area of expertise, depth of experience, and assessment performance.

Location

This role is fully remote. We are currently accepting applicants based in:

United States, Canada, Puerto Rico, Mexico, United Kingdom, Australia, New Zealand, and Argentina.

Where you can work

This role is 100% remote, for applicants located in these 8 countries: Argentina, Australia, Canada, United Kingdom, Mexico, New Zealand, Puerto Rico and United States.

From Braintrust's job posting, checked 14 Nov 2026.

About Braintrust

Keep all of your pay: published per-role bands, no talent fees.

How it pays: Weekly, and talent keeps 100%, says its AI training page (read 1 Nov 2026); its help center says talent is paid by invoice when the client pays, on standard net-30 terms, through Wise and Stripe (read 1 Nov 2026). Braintrust itself pays only to bank accounts in the 35 countries on its payments list (8 in the Americas, 14 in Europe, 8 in Asia-Pacific, 5 in the Middle East and Africa; help center article updated 26 Jul 2026, read 1 Nov 2026); with an account elsewhere you see only the roles whose client pays you directly.

When it pays: Weekly, by its AI training page. How often others pay

Interview: yes, for everyone it takes (Braintrust screening interview (AIR Screening Interviewer; the AI training page calls it the AI skills interview)). How the Braintrust AI interview works

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