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 backend engineering skills to build reproducible environments, solve software problems, and create reference solutions that help train AI models. This remote contract pays $60 to $120 per hour and is expected to run for 3 to 6 months.
Posted Aug 29, 2026
Use your CAM, CNC, and Autodesk Fusion 360 expertise to evaluate AI-generated manufacturing content and develop process-quality rubrics. This fully remote contractor project is expected to run for 3 to 6 months.
Posted Aug 29, 2026
Use advanced biology expertise to author and verify rigorous benchmark questions for AI research. This fully remote, asynchronous contract pays $60-$75 per hour and requires 20+ hours weekly.
Posted Aug 28, 2026
Create executable scientific computing problems that challenge frontier AI models, using your biology expertise and programming skills. This remote, six-week freelance engagement pays $70 per hour and requires at least 20 hours weekly.
Posted Aug 28, 2026
Use advanced physics and scientific programming to create executable research problems that test frontier AI models. This remote six-week contract pays $70 per hour for at least 20 hours weekly.
Posted Aug 28, 2026
Use doctoral-level philosophy expertise to create and evaluate rigorous AI benchmark questions in a worldwide, remote contract role paying $50 to $63 per hour. Work 20+ hours weekly through OpenTrain.
Posted Aug 28, 2026
Create and verify challenging legal multiple-choice questions for AI benchmarks in a fully remote contract role paying $83 to $105 per hour.
Posted Aug 28, 2026
Use advanced chemistry expertise to author and verify rigorous benchmark questions that evaluate AI understanding. This fully remote freelance role pays $61 to $77 per hour.
Posted Aug 28, 2026
Use your Norwegian music expertise to evaluate AI-generated lyrics and music for quality, originality, natural language, and prompt adherence. Work remotely for around 20 hours per week at $42-$78 per hour.
Posted Aug 28, 2026
Use your preclinical ADC or bispecific antibody expertise to annotate scientific data, evaluate AI outputs, and shape drug discovery models. This ongoing remote contract pays $60 to $100 per hour.
Posted Aug 28, 2026
Use your legal expertise to create difficult evaluation tasks, assess AI-generated responses, and calibrate quality for a worldwide contract role requiring 20+ hours per week.
Posted Aug 28, 2026
Use your Brazilian Portuguese voice acting skills to record characters, stories, and varied content for AI projects. This flexible freelance role offers worldwide availability and requires 20+ hours per week.
Posted Aug 28, 2026
Create polished German voice recordings that help train next-generation AI. Bring scripts, characters, and stories to life with clear diction, emotional range, and professional audio quality.
Posted Aug 28, 2026
Help improve AI legal reasoning by reviewing model answers, testing contract interpretation, and identifying citation and jurisdictional errors. This remote contractor role offers $245-$280 per hour for qualified attorneys.
Posted Aug 27, 2026
Evaluate AI-generated code, inspect model reasoning, and create rigorous software-engineering challenges that improve advanced AI systems. This remote contractor role offers $245-$280 per hour and requires 20+ hours weekly.
Posted Aug 27, 2026
Apply real venture capital judgment to AI training data, from market sizing and founder evaluation to investment memos and financial scenarios. This remote contractor role offers flexible work at $45 to $100 per hour.
Posted Aug 27, 2026
Use your data science, statistics, and quantitative expertise to evaluate AI model reasoning, create expert prompts and reference solutions, and improve next-generation systems. This remote contractor role offers $245-$280 per hour and requires 20+ hours weekly.
Posted Aug 27, 2026
Use real investment banking expertise to create and evaluate AI training data covering valuation, deal analysis, financial models, and client-ready written work. This remote contractor role offers $45-$100 per hour for 20+ hours weekly.
Posted Aug 27, 2026
Use private equity expertise to create realistic deal tasks, stress-test LBO models, write investment committee memos, and evaluate AI-generated financial analysis. This remote contract role pays $45 to $100 per hour.
Posted Aug 27, 2026
Evaluate AI-generated responses for accuracy, depth, and logical quality while creating expert prompts and reference answers. This worldwide, part-time contractor role offers $245 to $280 per hour for PhD-level expertise.
Posted Aug 27, 2026
Use your finance and investment experience to evaluate AI-generated models, valuation analyses, and market reasoning. This flexible contractor role pays $245-$280 per hour and requires 20+ hours weekly.
Posted Aug 27, 2026
Use management consulting expertise to evaluate AI reasoning, write high-quality prompts and model answers, and improve business strategy models. This remote contractor role offers 20+ hours per week at $245-$280 per hour.
Posted Aug 27, 2026
Evaluate and improve AI-generated writing against professional newsroom standards. This remote contractor role offers experienced journalists, editors, and writers 20+ hours per week at $245 to $280 per hour.
Posted Aug 27, 2026
Help improve AI with accurate Tamil audio transcription and linguistic review. Work remotely for 20+ hours per week on flexible contract assignments paying $10 to $24 per hour.
Posted Aug 27, 2026
Work remotely as a Telugu Transcription Expert for 20+ hours per week, transcribing and annotating audio, video, and text to improve AI systems. Earn $10-$24 per hour while applying your language expertise to meaningful AI training work.
Posted Aug 27, 2026
Transcribe German audio and help improve next-generation language AI from anywhere. This contractor role offers 20+ hours per week and pays $10-$25 per hour based on experience.
Posted Aug 27, 2026
Use your legal judgment to create rigorous AI evaluation tasks, review contract-focused responses, and produce gold-standard solutions. This worldwide, part-time contractor role requires professional legal qualifications and 20+ hours per week.
Posted Aug 27, 2026
Record expressive French voices for characters, stories, and scripted AI training content in a flexible freelance role requiring 20+ hours per week. Use your vocal range and professional recording setup to help shape next-generation AI.
Posted Aug 27, 2026
Use your Italian voice acting skills to record expressive audio for AI training. This flexible contractor role offers 20+ hours per week for performers with professional recording equipment.
Posted Aug 27, 2026
Use your PhD-level chemistry expertise to create and evaluate challenging scientific computing tasks for frontier AI models. This remote, six-week contract pays $70 per hour for 20 or more hours weekly.
Posted Aug 27, 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.
