Mathematics Expert

Overview

Rex is looking for mathematicians to help train and evaluate AI models on advanced mathematical reasoning. The role involves creating rigorous math problems, checking model solutions step by step, identifying where reasoning fails, and helping maintain consistent grading standards. Compensation is adjusted by country of residence.

What You'll Do

• Write proof-based and computational mathematics problems with complete solutions.
• Review AI-generated solutions step by step and identify logical gaps, unsupported steps, and calculation mistakes.
• Classify error types so the project team can better understand model failures.
• Write grading rubrics and reference solutions at a consistent level of difficulty.
• Review problems written by other experts for correctness, clarity, and originality.
• Provide clear written explanations suitable for model training.
• Follow project guidelines, participate in calibration and review sessions, and incorporate feedback to keep quality consistent.

Requirements

• Master’s or PhD in mathematics, or a Bachelor’s degree plus 2+ years of relevant experience.
• Strong command of at least one core area such as analysis, algebra, number theory, probability, combinatorics, or geometry.
• Ability to write clear, rigorous proofs.
• Excellent written English.
• Ability to work independently, meet deadlines, and remain reliable and detail-oriented in a remote setting.

Preferred Qualifications

• Research experience or mathematical competition experience.
• Experience with symbolic or numerical tools such as Python, Mathematica, or Lean.
• Teaching or problem-writing experience.

Compliance Notes

• Submitted content must be lawful, and you must have the right to share it.
• Do not submit confidential or proprietary material belonging to an employer, client, or third party, or personal data without a lawful basis.
• Rex may verify identity, credentials, ownership, and licensing, and may reject or remove submissions that do not meet requirements.
• Engagement and payment are subject to successful verification and to applicable sanctions, export-control, tax, and employment laws.
• The contractor agreement will set out ownership and licence terms for the work delivered.