Looking for remote AI training or data labeling work open to applicants located in Spain? 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. Eligibility and requirements can vary by individual posting.
Help advance large language models by designing challenging physics problems, writing rigorous solutions, and shaping evaluation benchmarks. This expert-level remote contract offers 20+ hours per week for graduate-level STEM specialists.
Posted Jul 17, 2026
Evaluate advanced Biology problems, solutions, and benchmarks to improve large language models. This flexible, worldwide contractor role offers 20+ hours per week for strong Biology communicators.
Posted Jul 17, 2026
Use postgraduate-level chemistry expertise to create, solve, annotate, and explain challenging problems that improve large language models. Work remotely for 20+ hours per week as an independent contractor.
Posted Jul 17, 2026
Use advanced physics knowledge to design challenging problems, solve them step by step, and help evaluate how large language models reason. This flexible remote contractor role is open worldwide.
Posted Jul 17, 2026
Use your Java and backend development skills to evaluate large language models, create fine-tuning datasets, and improve technical AI responses. This remote contractor role requires 20+ hours per week.
Posted Jul 17, 2026
Build JavaScript and TypeScript applications while evaluating AI responses, creating fine-tuning datasets, and supporting RLHF. This remote, one-month contractor assignment requires at least 20 hours per week.
Posted Jul 17, 2026
Build and review software that helps improve AI models through coding evaluation, response ranking, fine-tuning datasets, and RLHF. This worldwide, part-time contract role offers 20+ hours per week for developers with Python and JavaScript or TypeScript expertise.
Posted Jul 17, 2026
Use board game strategy, logic, probability, and rule-system expertise to evaluate AI reasoning, create benchmarks, and improve model quality. This remote contractor role requires 20+ hours per week.
Posted Jul 16, 2026
Help improve personalized conversational AI by creating Dutch prompts, comparing responses, detecting unsupported personalization, and writing evidence-based evaluations. This remote contractor project pays $20 per hour for at least 20 hours weekly.
Posted Jul 16, 2026
Evaluate how conversational AI uses personal context in Vietnamese, compare responses, and write evidence-based feedback. This remote, three-month contractor role pays $15 per hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Evaluate how AI personalizes responses for Thai users using multi-turn prompts, personal context, and side-by-side rankings. This remote contract pays $15/hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Evaluate how AI personalizes conversations in Hindi by designing multi-turn prompts, ranking responses, and writing evidence-based rationales. This remote contractor role pays $15 per hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Evaluate how AI uses conversation history and personal data to create helpful, natural responses in Indonesian. This remote contract pays $15 per hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Evaluate personalized AI responses in Turkish, create multi-turn prompts, and provide clear, rubric-based feedback. This remote contractor role pays $15 per hour and offers 30 or 40 hours per week.
Posted Jul 16, 2026
Evaluate how well AI systems use personal context in Korean conversations. Design multi-turn prompts, compare responses, and provide evidence-based feedback for $15/hour with 20+ hours per week.
Posted Jul 16, 2026
Evaluate how conversational AI uses personal context in Chinese, comparing responses, checking grounding, and writing evidence-based feedback. This remote three-month contractor role pays $15 per hour and requires at least 20 hours weekly.
Posted Jul 16, 2026
Design Arabic multi-turn prompts and evaluate how naturally and accurately AI uses personal context. Join a remote, three-month contractor engagement paying $15 per hour through OpenTrain.
Posted Jul 16, 2026
Evaluate how conversational AI uses personal context in Portuguese, rank responses, and explain quality issues. This remote contractor role pays $15/hour and requires 20+ hours per week.
Posted Jul 16, 2026
Use Russian and English to create analytical questions, verify claims, and evaluate model responses. This remote contractor role offers cutting-edge AI training work for entry-level applicants with strong research and critical-thinking skills.
Posted Jul 16, 2026
Evaluate finance-focused AI models, identify failure modes, and create benchmarks for tasks such as deal analysis and M&A assessment. This worldwide contractor role offers flexible work under 20 hours per week at $100 per hour.
Posted Jul 16, 2026
Use your software engineering judgment to evaluate, correct, and benchmark AI-generated code across the development lifecycle. This flexible contractor role offers 10 to 40 hours weekly with potential extensions.
Posted Jul 16, 2026
Evaluate how large language models solve realistic coding and bug-fixing tasks across open-source repositories. This worldwide, part-time contractor role offers hands-on AI training work for engineers comfortable with Git, Docker, and real codebases.
Posted Jul 16, 2026
Help improve large language models by creating and evaluating mathematical reasoning content. Apply your skills in algebra, geometry, calculus, logic, and clear written explanation in a flexible remote contract role.
Posted Jul 16, 2026
Use strong Python skills to create coding data, evaluate language-model responses, and improve AI training workflows. This fully remote, one-month contractor assignment offers 20, 30, or 40 hours per week.
Posted Jul 16, 2026
Evaluate and improve AI models through Python development, response ranking, dataset creation, and RLHF on a fully remote, one-month contractor assignment.
Posted Jul 16, 2026
Use your civil legal expertise to evaluate AI-generated analyses involving housing, family, consumer, foreclosure, and debt matters. This worldwide, remote contract role pays $170 per hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Review first-person household-task videos and create precise frame-level labels for AI training. This remote contractor role offers $10-$12 per hour and requires 20+ hours weekly.
Posted Jul 16, 2026
Evaluate Portuguese AI responses for natural, well-grounded personalization in realistic multi-turn conversations. This remote, three-month contractor role pays $15 per hour and offers 20 to 40 hours per week.
Posted Jul 15, 2026
Review how conversational AI uses personal context in German, compare responses, and explain nuanced quality judgments. This remote contractor role offers $15 per hour for a three-month engagement.
Posted Jul 15, 2026
Evaluate ChatGPT and Claude responses, create challenging prompts, and explain model strengths and weaknesses in clear American English. Work remotely for 20+ hours per week at $20-$30 per hour.
Posted Jul 15, 2026
AI training is human work that helps prepare and review examples used by artificial-intelligence systems. Depending on the role, tasks may include labeling images or video, transcribing or recording audio, writing or rating model responses, evaluating search results, translating text, reviewing code, or applying subject-matter knowledge. Roles open to applicants located in Spain can differ in their responsibilities, so inspect each live posting for the exact work involved.
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. The individual live posting is the source of truth for eligibility, qualifications, responsibilities, hours, pay, and other role-specific requirements.
