Statistician

We are looking for statisticians to help train and evaluate AI models on statistical reasoning and data analysis. You will design analysis tasks, review AI-generated statistical work, and write the reference answers that models are measured against.

Key Responsibilities

• Design statistical analysis tasks (hypothesis testing, regression, experimental design, causal inference) with reference answers.
• Review AI-generated analyses for correct method choice, assumptions, interpretation and communication of uncertainty.
• Develop and refine statistical and mathematical arguments used in AI evaluation tasks.
• Interpret and summarise complex numerical datasets for model-training scenarios.
• Write rubrics and structured feedback on model outputs.
• Document common statistical misconceptions that models repeat.
• Follow project guidelines, take part in calibration and review sessions, and incorporate feedback to keep quality consistent.

Required Qualifications

• Master's degree in statistics or a related field, or 5+ years of professional experience as a statistician or statistical analyst.
• Strong working knowledge of R or Python for statistical analysis.
• Experience with applied analysis on real datasets.
• Excellent written English.
• Reliable, detail-oriented, and able to work independently and meet deadlines in a remote setting.

Preferred Qualifications

• Experience training professionals in statistical methods for AI or machine learning.
• Clinical, survey or econometric analysis experience.
• Experience with causal inference or Bayesian methods.

Legal and Compliance Notice

• All content you submit 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; may reject or remove any submission; and may report unlawful submissions to the relevant authorities.
• 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 you deliver (to be confirmed by Rex Legal).

Compensation: USD $60–120 per hour, adjusted by country of residence.