OpenTrain is seeking a Physics AI Training Expert to review AI-generated responses, identify reasoning and calculation errors, and write high-quality model solutions. Applicants must possess an MS or PhD in Physics or a related field along with excellent English writing skills and prior data labeling or RLHF experience. This remote contractor position requires at least 20 hours per week and is open to candidates in Australia, Brazil, Canada, Germany, India, New Zealand, the UK, and the US.