Use your Machine Learning expertise to train and evaluate AI models.
Work 20+ hours per week on frontier AI research, evaluation, agent environments, synthetic data, and post-training. This worldwide contractor role requires advanced research engineering experience and English fluency.
Posted Sep 30, 2026
Review AI-generated mathematical reasoning, apply clear rubrics, and explain your judgments in writing. This remote contractor role requires English fluency and strong mathematical or AI workflow expertise.
Posted Sep 28, 2026
Create challenging machine learning questions and review AI-generated answers for accuracy, reasoning, and technical soundness. This remote contract role pays up to $75 per hour and typically involves 5 to 20 flexible hours per week.
Posted Sep 25, 2026
Review AI evaluation tasks, outputs, rubrics, verifiers, and test cases for technical quality. This remote, three-month contractor role requires at least 20 hours per week and four hours of Pacific Time overlap.
Posted Sep 21, 2026
Build data validation suites and test PII and PHI de-identification systems for accuracy, privacy, and data quality. This remote contract requires Python, SQL, ML evaluation, and privacy compliance experience.
Posted Sep 19, 2026
Test data pipelines and PII and PHI de-identification systems using Python, SQL, ML evaluation, and compliance checks. This worldwide contractor role requires 5+ years of relevant experience and 20+ hours per week.
Posted Sep 18, 2026
Review and improve code-generation systems across Python, Java, Rust, C++, Go, and TypeScript. Work remotely for 20+ hours each week on coding tasks, code review, and AI model evaluation.
Posted Sep 14, 2026
Help deploy and manage LangGraph AI applications using Azure, DevOps automation, Terraform, Docker, and Kubernetes. This remote contract role is for professionals in India and requires 8+ years of Azure or cloud DevOps experience.
Posted Sep 14, 2026
Evaluate machine learning code, models, and systems for correctness, performance, and reproducibility. This remote contractor role offers flexible work of about 15 hours per week and pays $80 to $150 per hour.
Posted Sep 11, 2026
Build and operate GPU infrastructure and production LLM serving systems on Google Cloud. This remote contractor role requires Python, Kubernetes, Docker, GPU operations, and model-serving experience.
Posted Sep 11, 2026
Build full-stack web applications and support AI model training through task creation, benchmark evaluation, and data preparation. This worldwide, part-time contract role requires React, Node.js, SQL databases, and experience with AI training workflows.
Posted Sep 11, 2026
Create rigorous scientific programming tasks, verified Python solutions, and tests that evaluate advanced AI models. This freelance project requires strong scientific computing skills and 20+ hours per week.
Posted Sep 11, 2026
Build and improve multi-step AI systems for advanced mathematical reasoning. This four-week contractor assignment requires 40 hours per week, advanced Python, and four hours of Pacific Time overlap.
Posted Sep 7, 2026
Evaluate AI model answers in data science, statistics, machine learning, experimentation, and quantitative reasoning. This remote contractor role pays $245-$280 per hour and requires at least one year of relevant professional experience.
Posted Aug 27, 2026
Use computational biology, cheminformatics, Python, and drug discovery expertise to build benchmarks and evaluate AI-generated scientific work. This contractor role pays $80-$110 per hour for 20+ hours weekly.
Posted Aug 3, 2026
Develop and deploy machine learning systems in Python across data pipelines, model optimization, monitoring, and production use cases. This part-time contract role requires 20+ hours per week and four years of hands-on experience.
Posted Aug 2, 2026
Evaluate how well LLMs solve real software engineering tasks using Ruby and open-source codebases. This remote contractor role requires 20 or more hours weekly and four hours of PST overlap.
Posted Jul 20, 2026
Review and improve AI-generated C and C++ code, solve difficult programming problems, and help build backend components for language model training. This contract role requires 20 or more hours each week and strong English communication.
Posted Jul 17, 2026
Evaluate how language models work with real software repositories, from GitHub issue triage to local testing and bug-fixing tasks. This contract role needs strong Go skills, 3+ years of engineering experience, and 20+ hours each week.
Posted Jul 17, 2026
Build Java backend components and help evaluate, fine-tune, and improve large language models. This remote contractor role requires 20+ hours per week, strong English, and solid software development skills.
Posted Jul 17, 2026
Help train and evaluate AI coding models with Python, JavaScript or TypeScript, response ranking, dataset creation, and RLHF. This worldwide contractor role requires 20+ hours per week and strong English.
Posted Jul 17, 2026
Analyze machine learning data, model outputs, evaluation metrics, and benchmark failures using Python and SQL. This remote contractor role requires 20 hours per week and is open in 10 countries.
Posted Jul 16, 2026
Work on benchmark-driven evaluation tasks across real machine learning codebases. Build and debug training, evaluation, and inference pipelines as a remote contractor for at least 20 hours per week.
Posted Jul 16, 2026
Build and validate Python data pipelines and evaluation tasks for AI benchmarks. This part-time contract requires 20+ hours weekly, 4 hours of daily PST overlap, and 3+ years of data-focused experience.
Posted Jul 16, 2026
Use Python, Git, and Docker to test real software projects and evaluate how well language models fix bugs. This contractor role requires 20+ hours weekly and is open to English speakers in nine countries.
Posted Jul 16, 2026
Review real open-source codebases, test bug-fixing tasks, and assess how large language models perform on software engineering problems. This remote contractor role requires 20+ hours per week and strong programming skills.
Posted Jul 16, 2026
Evaluate AI model responses, write Python solutions, and create training data for a one-month remote contractor assignment. You need at least three years of strong Python experience and must commit to 20, 30, or 40 hours per week.
Posted Jul 16, 2026
Evaluate AI models, rank responses, build fine-tuning datasets, and analyze public data using Python. This remote contractor role offers 20, 30, or 40 hours per week with Pacific Time overlap.
Posted Jul 16, 2026
Lead quality reviews for AI-generated Python code, machine learning workflows, and trainer work. This US-based contractor role pays $120 per hour and requires at least 20 hours each week.
Posted Jul 9, 2026
Review AI-generated data science work, code, models, and QA processes in a remote US contractor role paying up to $110/hour. Work 20+ hours weekly and apply in English through OpenTrain.
Posted Jul 8, 2026
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.
