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.
Use your management consulting expertise to evaluate AI-generated and human-created consulting deliverables, develop grading criteria, and provide evidence-based feedback. This worldwide contract role offers 20+ hours per week at $100 to $150 per hour.
Posted Jul 29, 2026
Use senior civil engineering judgment to create realistic AI evaluation tasks, calculations, technical narratives, and rubrics for infrastructure and construction workflows. This worldwide freelance role pays $70-$80 per hour and requires 20+ hours weekly.
Posted Jul 29, 2026
Use senior electrical engineering judgment to create and evaluate demanding AI tasks across power systems, circuit design, embedded systems, and certification. This remote contract offers 20+ hours per week at $70-$80 per hour.
Posted Jul 29, 2026
Create realistic evaluation tasks that test AI systems on enterprise mechanical engineering, product design, manufacturing, and certification. This remote contract pays $70-$80 per hour and welcomes experts in ASME or ISO standards.
Posted Jul 29, 2026
Use advanced Excel, PowerPoint, and Word skills to evaluate AI-generated business documents, compare outputs, and provide feedback that improves next-generation AI. This remote contract offers 20+ hours per week at $20-$60 per hour.
Posted Jul 29, 2026
Use your microbiology expertise to evaluate and improve next-generation AI systems. This remote contractor role offers $70-$90 per hour, flexible part-time work, and 20+ hours weekly.
Posted Jul 29, 2026
Use your materials science expertise to review technical content, evaluate AI-generated answers, and create high-quality training data. This remote contract role offers 20+ hours per week and pays $80-$130 per hour.
Posted Jul 29, 2026
Use your aerodynamics and computational fluid dynamics expertise to review technical content, refine AI training materials, and translate complex engineering results into actionable knowledge. This worldwide contract role offers 20+ hours per week at $80-$130 per hour.
Posted Jul 29, 2026
Help train next-generation AI by reviewing, editing, formatting, and extracting information from complex Word and PDF documents. This remote, part-time contractor role offers $20-$55 per hour and requires 20+ hours weekly.
Posted Jul 29, 2026
Create realistic PowerPoint, Excel, and Word business tasks, collaborate with an LLM on Office Open XML files, and evaluate model-generated deliverables. This worldwide contract role offers 20+ hours per week and $20 to $60 per hour.
Posted Jul 29, 2026
Use computational biology and medicinal chemistry expertise to annotate biological datasets, evaluate scientific content, and improve next-generation AI systems. This remote contractor role offers 20+ hours per week at $90-$120 per hour.
Posted Jul 28, 2026
Use medicinal chemistry and bioinformatics expertise to curate drug discovery data, evaluate AI-generated scientific content, and improve model reliability. This remote contractor role offers $90 to $120 per hour for 20+ hours weekly.
Posted Jul 28, 2026
Use your physics research expertise to evaluate and improve advanced AI systems remotely. This part-time contractor role offers 20+ hours per week and pays $70-$90 per hour.
Posted Jul 28, 2026
Join OpenTrain as an Audio and Video Data Annotator working 20+ hours per week on detailed labeling, quality review, and annotation improvement. Earn $6-$8 per hour in a worldwide contractor role.
Posted Jul 28, 2026
Annotate and review video and audio samples for next-generation AI systems in a flexible remote contractor role paying $6-$10 per hour. Bring strong attention to detail and clear English communication.
Posted Jul 28, 2026
Help evaluate how AI systems handle real medical problems by designing clinical scenarios, assessment frameworks, and evidence-based reasoning criteria. This flexible remote engagement is designed for practicing physicians.
Posted Jul 25, 2026
Evaluate how conversational AI uses personal context in Russian, compare responses, and write evidence-based feedback. This remote, three-month contractor role pays $15 per hour and requires at least 20 hours weekly.
Posted Jul 24, 2026
Review and annotate complex private equity, M&A, fund, banking, technology, and privacy documents to help train AI systems. This expert contractor role offers worldwide, part-time work at $90-$130 per hour.
Posted Jul 24, 2026
Play modern AAA games while capturing, organizing, and annotating gameplay data for AI training. This worldwide, part-time contract role pays $10-$15 per hour and requires 20+ hours weekly.
Posted Jul 24, 2026
Use Revit and Navisworks to review BIM coordination materials, identify construction clashes, and document clear technical resolutions for AI model evaluation. This worldwide, part-time contractor role requires 20+ hours weekly.
Posted Jul 24, 2026
Help prepare computer vision data by outlining qualifying objects in images with polygon segmentation. This entry-level, worldwide contract offers less than 20 hours per week at $4-$6 per hour, with more work possible after a successful trial.
Posted Jul 22, 2026
Build reproducible reinforcement learning environments that test how AI systems solve real-world coding problems. This remote contractor role offers flexible work of about 15 hours per week at $50 to $100 per hour.
Posted Jul 22, 2026
Use senior cloud infrastructure expertise to evaluate AI systems, build reinforcement learning environments, and provide precise technical feedback. This remote contractor role pays $60-$130/hour.
Posted Jul 22, 2026
Evaluate AI model responses for safety, factual accuracy, policy compliance, and alignment across high-risk topics. This remote expert contract pays $60-$70 per hour and requires 20+ hours per week.
Posted Jul 22, 2026
Review medicinal chemistry data, structures, reactions, and drug discovery content to improve AI training datasets. This worldwide, part-time contract offers 20+ hours per week at $60-$80 per hour.
Posted Jul 21, 2026
Use advanced neuroscience expertise to evaluate research, write clear explanations, and improve AI training materials. This remote contractor role offers flexible part-time work at $60 to $80 per hour.
Posted Jul 21, 2026
Use your biochemistry expertise to evaluate datasets, research, protocols, prompts, and AI-generated answers. This worldwide contract role offers 20+ hours per week at $60-$80 per hour.
Posted Jul 21, 2026
Use your molecular biology expertise to create scientific training data, evaluate AI-generated content, and improve model performance. This remote contractor role offers 20+ hours per week at $60-$80 per hour.
Posted Jul 21, 2026
Use advanced pharmacology expertise to evaluate AI responses, create training datasets, and improve model accuracy. This worldwide, part-time contract offers $60-$80 per hour for 20+ hours weekly.
Posted Jul 21, 2026
Manage the workflows, KPIs, reporting, and quality processes behind AI training data. This remote contractor role offers 20+ hours per week and pays $40 to $60 per hour.
Posted Jul 21, 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.
