Chemistry - Scientific Domain Expert

Join a leading AI lab's cutting-edge GenAI team to be at the core of the AI revolution, where your expertise fuels the development of the most advanced Large Language Models.

1. Overview

A leading AI lab is advancing the frontier of generative AI by training Large Language Models to reason rigorously across scientific domains. We're seeking talented Chemistry / Scientific Domain Experts to bring hands-on chemistry expertise and elevate the quality of our AI training and evaluation data.

This is a W-2 employment position with Cincinnatus LLC, requiring full-time onsite commitment in San Francisco for the 6-month engagement (40 hours per week, weekdays). This position will be placed at a leading AI Lab as part of their extended workforce.

2. Key Responsibilities

• Design chemistry-focused tasks and model evaluation workflows that test scientific reasoning.
• Translate chemistry expertise into clear instructions, rubrics, grading criteria, and review processes.
• Read and synthesize scientific papers and technical materials.
• Evaluate model-generated outputs for scientific correctness, rigor, and usefulness; provide clear written technical feedback.
• Partner with research and engineering teams to improve data quality, evaluation design, and iteration loops.
• Collaborate with other subject matter experts to ensure consistency and accuracy in training data.

3. Core Qualifications

• PhD or equivalent research experience in chemistry (or a closely adjacent field such as chemical biology, materials chemistry, or computational chemistry).
• Strong scientific reasoning and the ability to assess correctness and rigor of chemistry-related claims, papers, and model outputs.
• Hands-on technical fluency with datasets, notebooks, Python, LLMs, and scientific software; able to move fluidly between scientific concepts and computational workflows.
• Ability to commit to 40 hours per week, fully onsite in San Francisco, for the duration of the 6-month engagement.
• Strong written communication skills and the ability to explain scientific decisions and methodological choices clearly.
• Bonus: experience in computational chemistry, cheminformatics, molecular modeling, or adjacent chemistry-focused computational research.
• Bonus: prior Mercor annotation / evaluation experience (2+ projects).

About Cincinnatus LLC: Cincinnatus LLC is an enterprise staffing company that partners with leading technology companies to source and employ highly skilled professionals for contingent and contract-based opportunities. Cincinnatus serves as the employer of record for these engagements, providing W-2 employment, payroll, benefits, and compliance, while placing employees directly within client teams to work on high-impact initiatives.

Equal Employment Opportunity: Cincinnatus is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or any other legally protected characteristic.