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 sales and go-to-market expertise to evaluate AI-generated documents, spreadsheets, and presentations. This remote freelance role pays $80-$120 per hour and requires 20+ hours weekly.
Posted Jul 10, 2026
Review AI-generated healthcare documents, spreadsheets, and presentations for factual accuracy, clinical rigor, and presentation quality. This remote contractor role pays $80 to $120 per hour and requires at least five years of healthcare or clinical experience.
Posted Jul 10, 2026
Use your product management expertise to evaluate AI-generated documents, spreadsheets, and slide decks for accuracy, rigor, and professional quality. This remote hourly contract pays $80 to $120 per hour.
Posted Jul 10, 2026
Review AI-generated documents, spreadsheets, and slide decks for accuracy, rigor, and presentation quality. Earn $80-$120 per hour in a flexible, remote contractor role with OpenTrain.
Posted Jul 10, 2026
Use professional music production and critical listening skills to evaluate Russian and English AI-generated songs, lyrics, and vocals. This remote contract pays $35-$49 per hour for flexible work of around 20 hours weekly.
Posted Jul 10, 2026
Use your user and customer research expertise to evaluate AI-generated documents, spreadsheets, and presentations. This remote contractor role offers flexible work at $80-$120 per hour through OpenTrain.
Posted Jul 10, 2026
Lead quality for Spanish AI training projects by reviewing generated content, guiding trainers and QAs, and improving language-review workflows. This part-time contractor role offers 20+ hours per week at $30-$40 per hour.
Posted Jul 9, 2026
Review and improve Spanish and English AI outputs using advanced localization, MQM, and LQA expertise. This fully remote contractor role offers $25-$35 per hour and requires 20+ hours weekly.
Posted Jul 9, 2026
Review and improve AI-generated English responses, write expert feedback, and test guided speech conversations. This remote contractor role pays $20-$25 per hour and requires 20+ hours weekly.
Posted Jul 8, 2026
Use your accounting expertise to evaluate AI-generated answers, create gold-standard examples, and improve model reasoning across journal entries, reconciliations, and financial reporting. Remote contract work offers 20+ hours per week.
Posted Jul 8, 2026
Use your legal expertise to evaluate AI-generated answers, check reasoning and citations, and create high-quality legal analyses, memos, and model responses. This remote contractor role offers 20+ hours weekly at $40-$120 per hour.
Posted Jul 8, 2026
Build and improve machine learning models remotely as a contractor using Python, MongoDB, major ML frameworks, and large datasets. Earn $80-$140 per hour while contributing to practical AI training workflows.
Posted Jul 3, 2026
Annotate approximately 60 engineering diagram sheets as graph data, labeling classified symbols, routing nodes, bounding boxes, and connections. A paid pilot comes first, with a fixed project price of $499.
Posted Jun 30, 2026
Join a remote, part-time project annotating humanoid-robot videos for vision-language-action models. Bring prior VLA annotation experience, Level B capability, and familiarity with Encord or another labeling platform.
Posted Jun 27, 2026
Use your UI/UX expertise in a worldwide contract opportunity focused on user-centered product design, design systems, and usability. The $100 fixed-price engagement includes an AI interview assessing your design judgment and experience.
Posted Jun 15, 2026
Review and correct AI-generated extractions from legal, financial, accounting, and compliance documents. Use JSON schemas and careful document analysis in a flexible, worldwide contract role paying $8 to $11.20 per hour.
Posted May 14, 2026
Use your pathology expertise to evaluate super-resolution algorithms by comparing whole-slide images and rating image quality. This remote, part-time contractor role pays $100-$200 per hour and requires a licensed pathologist.
Posted May 12, 2026
Help build a multimodal benchmark of African cultural content by validating images, refining captions, and adding cultural context. Work flexibly on a browser-based platform for less than 20 hours per week.
Posted Apr 28, 2026
Use your accounting or finance expertise to review financial documents, correct OCR, and structure tables and key-value data for AI training. This worldwide contractor role pays $7-$9 per hour and requires 20+ hours weekly.
Posted Apr 27, 2026
Record scripted Dutch dialogue from a professional or prosumer setup and help improve AI voice systems. This remote contract offers flexible scheduling, clear audio standards, and a listed rate of $83 to $150 per hour.
Posted Apr 23, 2026
Rate image quality metrics and assess image quality tools in a remote AI training project. This worldwide contractor role offers flexible part-time work at $5 to $7 per hour.
Posted Apr 15, 2026
Record clear, natural scripted audio in English and one or more supported languages using professional equipment. This worldwide, part-time contractor role offers $40 to $60 per hour and 20+ hours of weekly work.
Posted Apr 10, 2026
Review and improve auto-generated annotations across an 8,000-frame refinery dataset using CVAT. This worldwide, part-time contractor project offers a fixed $1,200 payment and requires 20+ hours per week.
Posted Apr 5, 2026
Use Python and advanced computer science expertise to design problems, validate AI-generated solutions, and score multi-step reasoning. This project-based contractor role offers global remote work at $15-$40 per hour.
Posted Apr 5, 2026
Use advanced Python, SQL, statistics, machine learning, and GenAI expertise to author realistic data science problems that help train and evaluate AI systems. This remote, project-based contractor role pays $15 to $40 per hour.
Posted Apr 5, 2026
Use expert Python, statistics, SQL, and GenAI knowledge to create and verify challenging computational machine learning problems. This project-based remote contract offers $15 to $40 per hour.
Posted Apr 5, 2026
Use your Chinese localization expertise and C1 English skills to evaluate, fact-check, and improve AI-generated content. This remote contractor role offers flexible work of 20 or more hours per week.
Posted Apr 3, 2026
Evaluate and red-team large language models in Hebrew and English, documenting safety failures and policy gaps. This fully remote contractor role pays $26-$38 per hour for 20+ hours weekly.
Posted Apr 3, 2026
Work remotely as a French and English AI Safety LLM Evaluator, reviewing model responses, red-teaming safety boundaries, and creating evaluation data. Earn $24 to $36 per hour while helping improve safer AI systems.
Posted Apr 3, 2026
Review and improve French-language AI responses as a remote, hourly contractor. Use expert judgment in French linguistics, reasoning quality, editing, and bilingual communication while earning $16 to $26.50 per hour.
Posted Apr 3, 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.
