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.
Create rigorous, executable AI evaluation tasks grounded in scientific computing, mathematics, and programming. This remote contract role pays $70 per hour and requires 20+ hours weekly.
Posted Aug 27, 2026
Review AI-generated financial research and trading analysis against relevant market information, rate response quality, and provide clear feedback in a flexible, remote contract role.
Posted Aug 26, 2026
Use advanced design judgment to annotate editorial, poster, marketing, and short video assets for AI training. Work remotely for $20-$50 per hour with a flexible 20+ hour weekly commitment.
Posted Aug 26, 2026
Use advanced ear training, musical notation expertise, and Python audio analysis to transcribe polyphonic SATB recordings into accurate MusicXML. This flexible remote contractor role offers approximately 15 hours per week at $50 to $100 per hour.
Posted Aug 26, 2026
Help improve multilingual AI by quality-checking Spanish audio, transcriptions, timestamps, speaker labels, and metadata. This fully remote, 15-week contractor project requires native LATAM Spanish and at least 40 hours per week.
Posted Aug 26, 2026
Create expressive Spanish (Spain) voice recordings that help train modern AI systems. This flexible, fully remote freelance role is suited to experienced voice actors with professional recording equipment.
Posted Aug 26, 2026
Use advanced 3D/CGI editing, animation, motion graphics, and visual effects to create polished video assets for robotics and educational AI training. This remote contractor role offers $30-$80 per hour and flexible work of 20+ hours weekly.
Posted Aug 25, 2026
Evaluate AI agents on realistic software engineering tasks and build reliable MCP-based reinforcement learning environments. This flexible remote contractor role offers an ideal rate range of $60 to $120 per hour.
Posted Aug 25, 2026
Use your software engineering expertise to build MCP-powered reinforcement learning environments that test how AI agents solve real-world coding problems. This flexible contractor role pays $60 to $120 per hour.
Posted Aug 25, 2026
Use psychiatry or clinical psychology expertise to review and improve AI content for military personnel and veterans. This remote contract role offers 20+ hours per week and pays $100 to $200 per hour.
Posted Aug 25, 2026
Use a PhD in child development or developmental psychology to review datasets and evaluate AI outputs for accuracy, cultural appropriateness, and developmental relevance. Remote contractor work offers 20+ hours per week at $100-$300 per hour.
Posted Aug 25, 2026
Create and evaluate rigorous applied physics questions for AI benchmarks, covering fields from quantum optics to semiconductor physics. Work remotely as a contractor for $61-$77 per hour, with a 20+ hour weekly commitment.
Posted Aug 25, 2026
Assess AI-generated responses for accuracy, logic, relevance, and completeness while creating detailed feedback and training examples. This remote freelance assignment offers flexible work of 20+ hours per week.
Posted Aug 25, 2026
Use your game-systems expertise to evaluate AI-generated design content, progression systems, reward economies, and chatbot responses. This flexible, worldwide contractor role requires 20+ hours per week and strong English communication.
Posted Aug 24, 2026
Use your commercial contract and regulatory expertise to create gold-standard legal tasks and evaluate AI responses. This remote contract role is open worldwide for English-speaking legal professionals available 20+ hours weekly.
Posted Aug 24, 2026
Create challenging AI evaluation tasks focused on semiconductor materials and molecular modeling. Use scientific judgment, programming, and rubric design in a flexible, worldwide contract role paying $70 per hour.
Posted Aug 23, 2026
Join a short-term research project manually segmenting structural cracks in high-resolution UAV bridge images. Use your civil or infrastructure inspection experience to create precise, independent reference annotations.
Posted Aug 23, 2026
Use your DevOps expertise to design infrastructure tasks, write reference solutions, and evaluate AI-generated code. This worldwide contract offers $50-$100 per hour and 20+ hours of flexible work each week.
Posted Aug 22, 2026
Use your legal judgment to create authoritative tasks, review AI-generated legal responses, and improve practical recommendations. This contract role offers flexible work of 20+ hours per week for experienced legal professionals.
Posted Aug 22, 2026
Use 8 to 15 years of accounting or audit expertise to create and evaluate advanced AI training tasks grounded in US GAAP, controls, assurance, and reporting. This flexible contractor engagement requires at least four hours daily, with Pacific Time overlap.
Posted Aug 22, 2026
Use your technology transactions expertise to redline contracts, assess AI-generated legal responses, and build evaluation standards for legal AI systems. This remote contractor role offers flexible part-time work at an advertised $90-$150 per hour.
Posted Aug 22, 2026
Use your US corporate law expertise to evaluate legal documents, deal structures, and litigation materials that help train advanced AI systems. This remote contract role offers flexible work at $140-$400 per hour.
Posted Aug 21, 2026
Use your litigation and transactional expertise to review legal documents, draft clauses, and evaluate scenarios that improve AI-generated legal content. This remote contractor role pays $140-$400 per hour and requires US bar admission.
Posted Aug 21, 2026
Use your US legal expertise to analyze, draft, review, and evaluate sophisticated legal materials that help improve AI systems. This remote contractor role offers 20+ hours per week and $140-$400 per hour.
Posted Aug 21, 2026
Apply your U.S. immigration law expertise to evaluate AI-generated legal content, research, and workflows remotely. This contractor role pays $140 to $400 per hour and requires an active law license and significant BigLaw experience.
Posted Aug 21, 2026
Use your family law expertise to review, analyze, and annotate complex legal documents for AI training. This remote contractor role offers flexible part-time work at $140 to $400 per hour.
Posted Aug 21, 2026
Use your M&A legal expertise to review transaction documents, evaluate AI responses, and improve legal training data remotely for $140-$400/hour. Prior AI training experience is not required.
Posted Aug 21, 2026
Create challenging, research-driven questions and evaluate AI model answers using citations, clear reasoning, and detailed quality standards. This worldwide remote contractor role offers flexible part-time work paying $20 to $60 per hour.
Posted Aug 21, 2026
Use clinical knowledge to create challenging medical questions, verify answers against literature and guidelines, and evaluate AI responses. This flexible worldwide contract offers 10-15 hours per week at $40-$90 per hour.
Posted Aug 21, 2026
Create and verify rigorous mathematics questions that help evaluate advanced AI systems. This remote contractor role offers flexible part-time work at $61 to $77 per hour for doctoral-level experts.
Posted Aug 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.
