Find remote AI training and data labeling jobs open to applicants in Spain.
Review legal documents, case materials, and model responses for civil and commercial litigation strategy. This flexible entry-level project pays $80 to $150 per hour equivalent, paid per task that meets the project specifications.
Posted Oct 13, 2026
Coordinate contributors, workforce data, onboarding, and project capacity across AI training work. This remote, 16-week freelance role also includes comparing chatbot responses and making final assessments.
Posted Oct 13, 2026
Guide quality decisions for AI annotation and chatbot evaluation projects. You will lead calibration, resolve difficult cases, review audits, and improve guidelines in a remote, project-based role.
Posted Oct 13, 2026
Lead quality strategy for large-scale AI training data and chatbot evaluation programs. Build quality systems, guide QA teams, and improve delivery across a 16-week project.
Posted Oct 13, 2026
Review AI-generated chatbot responses, apply detailed rubrics, and write clear feedback that helps improve AI systems. This remote, 16-week contractor project requires fluent English and runs five days per week.
Posted Oct 13, 2026
Review AI chatbot responses against project rubrics, explain your judgments, and help improve model behavior. Work 20+ hours per week across five working days, with weekends as needed and two weekdays off.
Posted Oct 13, 2026
Assess Python-focused large language model responses for accuracy, reasoning, and quality, then give clear feedback that supports model improvement. This worldwide contract role requires 20+ hours per week, fluent English, a relevant master's degree, and three years of experience.
Posted Oct 13, 2026
Evaluate large language model answers, design challenging prompts, and check responses against structured data and evidence. This remote, four-week contractor assignment offers 20, 30, or 40 hours per week with Pacific Time overlap.
Posted Oct 13, 2026
Evaluate computer-using AI agents by researching claims, solving reasoning tasks, and rating model responses. This worldwide freelance role offers ongoing work for 20 or more hours per week.
Posted Oct 13, 2026
Review transformed datasets and documents for missed or mishandled personal information, record discrepancies, and give clear feedback. Pay is $31 to $60 per hour, with applications starting through OpenTrain.
Posted Oct 12, 2026
Review and improve annotated video data for AI training projects. This remote contract role offers flexible work for experienced video annotation professionals available for 20+ hours per week.
Posted Oct 10, 2026
Annotate video footage by creating and reviewing bounding boxes, correcting errors, and following detailed project guidelines. This remote, part-time contract role requires three or more years of annotation experience, English fluency, and 20+ hours per week.
Posted Oct 10, 2026
Review scientific materials, improve AI-generated answers, and explain your judgments in Life Sciences Scientific Reasoning projects. This remote contractor role is open worldwide and requires fluent English plus relevant subject expertise.
Posted Oct 10, 2026
Work 20+ hours a week on analytical language-model training, including research, reasoning, data interpretation, summaries, and detailed feedback on model answers. Open worldwide to candidates with strong English skills.
Posted Oct 10, 2026
Review language-model responses, apply clear evaluation rubrics, and explain your judgments in English. This remote contractor project runs for 2 to 3 weeks with tasks of about 60 minutes each.
Posted Oct 10, 2026
Review inpatient pediatric records, clinical notes, and FHIR data to assess AI-generated medical claims and documentation. Pay is $80 to $125 per hour equivalent, paid per task that meets project specifications.
Posted Oct 10, 2026
Review adult inpatient records, FHIR data, and clinical notes for AI training. The role pays $80 to $125 per hour equivalent, paid per task that meets project specifications, and requires board certification in Internal Medicine.
Posted Oct 10, 2026
Review short video and audio clips, assess AI-generated descriptions, and explain content-quality decisions using clear project guidelines. This remote contract role pays $8 to $10 per hour and requires fluent English.
Posted Oct 10, 2026
Review AI-generated fixed income and rates research, backtests, and systematic trading strategies as a contractor. Earn $80-$150 per hour and apply through OpenTrain before completing the hiring-site application.
Posted Oct 10, 2026
Review finance-focused AI responses, write evaluation rubrics, and give structured feedback using your professional financial judgment. This remote contractor role pays $30 to $40 per hour and involves flexible, asynchronous collaboration.
Posted Oct 10, 2026
Review AI-generated rates trading strategies for realism, market viability, and risk awareness using your professional rates-market experience. This part-time contract pays $80 to $100 per hour, with applications through OpenTrain.
Posted Oct 10, 2026
Review inpatient medical records, clinical notes, and FHIR data to help improve AI systems. Pay is $80 to $125 per hour equivalent, paid per task that meets the project specifications.
Posted Oct 10, 2026
Manage annotation, data collection, analysis, reporting, and quality workflows for AI training projects. This entry-level contract role pays $40 to $60 per hour and requires at least 20 hours weekly.
Posted Oct 9, 2026
Create realistic Earth sciences tasks for AI training and evaluation using scientific code, environmental datasets, simulations, and automated tests. This remote contractor role is open worldwide and requires fluent English and advanced technical experience.
Posted Oct 9, 2026
Review code, simulations, circuit designs, automated tests, and technical AI evaluation tasks while guiding a pod of 5 to 10 trainers. This four-week contractor assignment requires advanced technical experience, Linux skills, and at least 20 hours per week.
Posted Oct 9, 2026
Lead a pod of technical trainers creating and reviewing chemical engineering tasks for AI training. Evaluate simulations, models, graders, and engineering results using advanced technical judgment.
Posted Oct 9, 2026
Review AI-generated work in mechanical and aerospace engineering simulation, apply detailed rubrics, and explain your judgments clearly. This remote contractor role is open worldwide to English-fluent candidates with relevant engineering expertise.
Posted Oct 9, 2026
Review civil and structural engineering models, simulations, reference solutions, and automated graders for AI evaluation tasks. This remote contractor assignment requires advanced engineering experience, programming skills, and at least 20 hours per week.
Posted Oct 9, 2026
Build MCP tools, improve AI coding assistant workflows, and create production-ready data applications for agentic AI systems. This part-time contract role is open worldwide and requires 20 or more hours each week.
Posted Oct 9, 2026
Design realistic coding-agent benchmark tasks using production-like software, security tests, and evaluation tools. This remote contractor role requires strong Python skills, deep software engineering experience, and at least 20 hours per week.
Posted Oct 9, 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.
