Use your Machine Learning expertise to train and evaluate AI models.
Review AI-generated data science content, code, models, and QA work as a remote Data Scientist Team Lead. This US contractor role pays up to $110 per hour and requires 20+ hours per week.
Posted Jul 8, 2026
Review AI-generated data science reasoning, code, and model outputs, write reference solutions, and compare responses for accuracy. This remote contractor role pays up to $60 to $100 per hour and requires professional data science experience.
Posted Jul 8, 2026
Build and evaluate machine learning models with Python, MongoDB, and common ML libraries in a remote, part-time contractor role paying $80 to $140 per hour. Apply through OpenTrain, then complete the hiring site application.
Posted Jul 3, 2026
Create and verify realistic, computationally intensive data science problems using Python, SQL, statistics, machine learning, and GenAI. This global contract offers flexible project work for experienced data science specialists.
Posted Apr 5, 2026
Create and verify computational machine learning and STEM problems using Python, statistics, SQL, and modern AI tools. This global, project-based contract pays $15 to $40 per hour for about 10 to 20 hours weekly during active phases.
Posted Apr 5, 2026
Build and improve automation workflows powered by large language models. You will refine prompts, review model outputs, and create evaluation criteria for practical communication and content tasks.
Posted Mar 29, 2026
Design realistic tests for AI agents, define expected behavior, and review model outputs. This part-time contract pays $18 to $24 per hour and requires 20 or more hours each week.
Posted Jan 13, 2026
Design and verify complex Python and SQL problems that test full-pipeline data science skills for advanced AI systems. This worldwide contractor role pays $50 per hour for fewer than 20 hours per week.
Posted Dec 3, 2025
Build Python infrastructure for LLM training and agent evaluation, including secure sandboxes, task frameworks, and scoring pipelines. This remote contract offers 20+ hours weekly and $34 to $42 per hour in the US or Canada.
Posted Jul 25, 2025
Build and maintain Python infrastructure for LLM training and agent tooling, including secure sandboxes, CI/CD pipelines, and testing systems. This remote contract role offers $12.50 per hour and requires at least 20 hours per week in eligible countries.
Posted Jul 25, 2025
Machine Learning expertise may be applied to preparing or reviewing examples for artificial-intelligence systems. Depending on the individual assignment, that can include writing or rating model responses, evaluating search results, reviewing code, annotating images or video, transcribing or recording audio, or translating text. The individual posting defines which activities apply and what the project asks you to do, so read it before deciding whether to explore a role.
OpenTrain is the hiring organization for roles on OpenTrain. Candidates apply through OpenTrain, and OpenTrain may place or refer successful candidates to the client whose project they will support. Hiring, eligibility, responsibilities, and other requirements are specific to each role, so use the individual live posting as the source for those details.
