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.
Help evaluate finance AI by creating and reviewing 150 private wealth management questions and answers, then rating responses against certified human advisor standards. This worldwide, part-time contract pays $500 fixed.
Posted Dec 19, 2025
Use advanced Spanish localization, translation, and LQA expertise to evaluate and improve AI-generated content. This part-time contractor role is based in Spain, pays $24 per hour, and requires less than 20 hours weekly.
Posted Dec 19, 2025
Review and annotate Polish-language text, speech, and image data remotely for $20 per hour. Choose full-time availability or work at least 20 hours weekly as a meticulous Polish speaker.
Posted Dec 18, 2025
Record five Dutch conversations online with another participant across street and driving scenarios. This entry-level audio project takes about 1.5 hours and pays a $100 fixed price.
Posted Dec 17, 2025
Join OpenTrain as an AI Data Annotation Specialist supporting text, image, and audio annotation. This part-time contractor role is for Indian nationals based in India and requires fewer than 20 hours per week.
Posted Dec 17, 2025
OpenTrain AI is seeking an automotive CAN signal subject expert to create training data that maps natural-language vehicle use cases to the signals needed to address them. This worldwide contractor project pays a fixed $2,000.
Posted Dec 15, 2025
Use Python and mechanical engineering expertise to create and verify demanding simulations and numerical solutions that help train advanced AI models. This flexible, part-time contract pays $10 to $45 per hour.
Posted Dec 12, 2025
Label architectural floor plans for an AI model that detects rooms and occupancy types. Work remotely for $10 per hour, using Roboflow to create accurate polygon and segmentation annotations.
Posted Dec 5, 2025
Help build a benchmark dataset for financial AI by collecting, anonymizing, and annotating approximately 10 documents with accurate JSON ground truth. This worldwide, part-time contract offers a fixed $300 payment.
Posted Dec 5, 2025
Use advanced Python, SQL, statistics, and machine learning expertise to design and verify realistic data science problems that train and evaluate cutting-edge AI systems.
Posted Dec 3, 2025
Help train vision-language AI by finding and labeling cooking moments in food videos. As a worldwide, English-language contractor, you will mark precise timestamps, classify actions, and write clear visual descriptions in Label Studio.
Posted Nov 19, 2025
Watch NBA games and record player actions, quarters, and game-clock times using a simple template. This flexible, entry-level contractor role offers $0.20 per label, plus a paid streaming subscription and a listed $50 payment.
Posted Nov 18, 2025
Evaluate and attack AI models and agents to uncover security vulnerabilities, build reproducible tests, and improve LLM safety. This flexible remote contract role offers less than 20 hours per week and compensation up to $55 per hour.
Posted Nov 17, 2025
Label volleyball actions such as spikes, blocks, serves, sets, and receives in images using CVAT. This entry-level, worldwide contract role offers flexible work under 20 hours per week and pays $0.03 per label.
Posted Nov 16, 2025
Label volleyballs actively used in rallies for a sports analytics project. This one-time, entry-level contract uses CVAT, pays $0.04 per label, and is open worldwide.
Posted Nov 14, 2025
Label scratches, cracks, pits, blemishes, missing surfaces, and discoloration in 20MP smartphone screen photos. This flexible, entry-level contractor role offers less than 20 hours per week at $2 per hour.
Posted Nov 14, 2025
Help train computer vision systems by outlining individual recycling objects in images with polygon segmentation tools. This worldwide, entry-level contractor role pays $5 per hour.
Posted Nov 11, 2025
Join a worldwide, English-language contract project labeling PPE images for AI-powered object detection. Use Roboflow to create accurate bounding boxes and classify safety equipment and compliance conditions.
Posted Nov 4, 2025
Label buttons and related objects in photos for machine learning recognition. This worldwide, entry-level contractor project pays $0.05 per label and uses Label Studio.
Posted Oct 27, 2025
Build polished, high-performance web interfaces as a remote Frontend Web Developer working with JavaScript or TypeScript and a modern framework. Earn $35 per hour with a minimum commitment of 17–20 hours weekly.
Posted Oct 27, 2025
Research and verify company information from official registries, websites, LinkedIn, and press sources. This remote, intermediate contractor role pays $15 per hour and uses careful human judgment to create accurate, traceable business data.
Posted Oct 27, 2025
Review and improve AI-generated chemistry answers for $80 per hour. Apply your chemistry expertise to evaluate reasoning, calculations, mechanisms, safety, and scientific writing in a flexible worldwide contract role.
Posted Oct 24, 2025
Use your biology PhD and research expertise to evaluate AI-generated responses for correctness, reasoning, methodology, and clarity. This worldwide contract role pays $80 per hour and offers part-time work through OpenTrain.
Posted Oct 24, 2025
Use your physics expertise to evaluate AI-generated solutions, identify subtle errors, and write rigorous exemplars for $80 per hour. This worldwide, part-time contractor role requires 17–20 hours weekly and strong scientific English.
Posted Oct 24, 2025
Use your Python and AI coding tool experience to test internal coding software as a part-time contractor. Work worldwide for under 20 hours per week at $100 per hour through OpenTrain.
Posted Oct 17, 2025
Use your frontend expertise to build and refine responsive, accessible web interfaces for AI training work. Earn $10–$30 per hour, with up to $40–$50 for exceptional portfolio quality and delivery.
Posted Oct 6, 2025
Join OpenTrain as a part-time AI Red Team Engineer earning $40 per hour to test LLMs, agents, and RAG pipelines through adversarial security evaluations. Use penetration testing, automation, and LLM security expertise in a remote contract role.
Posted Oct 6, 2025
Use automotive engineering expertise and Python to evaluate AI prompts, calculations, design reasoning, and model responses. This flexible part-time contract pays $40 per hour and requires less than 20 hours weekly.
Posted Oct 1, 2025
Join a 4–6 week contract project labeling exact scene boundaries across approximately 1,000 YouTube videos. Experienced video annotators and teams will use provided guidelines and tools to create high-quality temporal segmentation data.
Posted Sep 14, 2025
Help build a guitar image dataset by labeling frets, fretboards, and nuts with precise polygons in Label Studio. This worldwide, entry-level contractor project pays a fixed $500.
Posted Sep 8, 2025
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.
