OpenTrain AI is seeking a US-based Chemistry Quality Assurance Lead to evaluate AI-generated chemistry content, calculations, and trainer QA work for scientific accuracy, safety, and adherence to rubrics. Candidates must have a strong background in chemistry or related fields, clear English written communication skills, and experience with AI training, data annotation, or LLM evaluation. The position is a remote, part-time contractor role requiring at least 20 hours per week.