OpenTrain is seeking a Backend Coding Task and Verifier Specialist to design realistic backend programming challenges and build deterministic verifiers for evaluating AI-generated code. Candidates need strong development experience in languages such as Python, Java, Node.js, Go, Rust, TypeScript, or C++, along with expertise in building scalable APIs and debugging software. The role is a flexible, remote contractor opportunity requiring English proficiency and approximately 15 hours per week.