OpenTrain is hiring a Senior Data Science AI Task Designer for a flexible, part-time remote contract of less than 20 hours per week. The role involves designing and verifying realistic, deterministic data science problems and reference solutions in Python and SQL to train and evaluate AI systems. Candidates must hold a Master's or PhD in a quantitative field, possess at least 5 years of industry data science experience, have C1+ English proficiency, and comply with specified country and US state location restrictions.