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).