OpenTrain AI is seeking intermediate-level Kotlin developers to evaluate, fact-check, and compare AI-generated Kotlin responses, as well as create model solutions and explanations. Applicants must have at least two years of hands-on Kotlin experience, a bachelor's degree in Computer Science or a related field, strong English writing skills, and availability for 20+ hours per week. The remote contractor position is open to candidates residing in 17 specified countries across Asia, Europe, and the Americas.