Chemistry Specialist

We are looking for chemists with deep expertise in a specific subdiscipline to help train and evaluate AI models. You will write and review questions in your area and judge the correctness of AI answers.

Key Responsibilities

• Write and review chemistry questions in your subdiscipline (organic, inorganic, physical, analytical or computational).
• Assess AI answers for correctness and explain errors.
• Write reference answers with clear mechanistic or quantitative justification.
• Review other experts' questions for difficulty and accuracy.
• Give structured written feedback.
• Follow project guidelines, take part in calibration and review sessions, and incorporate feedback to keep quality consistent.

Required Qualifications

• Master's or PhD in chemistry with demonstrated expertise in at least one subdiscipline.
• Ability to explain complex chemistry clearly.
• Excellent written English.
• Reliable, detail-oriented, and able to work independently and meet deadlines in a remote setting.

Preferred Qualifications

• Research publications in your subdiscipline.
• Teaching experience.
• Experience with computational chemistry tools.

Content Restrictions

• Do not write, request or submit synthesis routes, formulations, quantities or operational details for chemical, biological, radiological, nuclear or explosive weapons, or for illicit drugs.
• If a task, a model output or a guideline contains such content, stop, do not reproduce it, and report it to the project team.
• Safety-related answers must stay at the level of general hazard awareness and appropriate safety practice.
• Rex may reject or remove any submission that breaches these rules.

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 $50–90 per hour, adjusted by country of residence.