ph3Remote Data Labeling Jobs in Madrid (Fully Remote) /h3 pRex.zone is hiring for a full-time, fully remote data labeling role focused on training-data creation and quality control for AI/ML systems. You will label and evaluate text, images, audio, and conversations used in large language model evaluation and computer vision annotation workflows, improving training data quality, annotation consistency, and model performance. /p h3What You’ll Work On /h3 ul liText labeling for NLP tasks (classification, NER, summarization) and rubric-based decision making /li liPrompt evaluation and LLM response scoring (helpfulness/harmlessness/honesty) /li liRLHF-style preference ranking and pairwise judgments /li liQA evaluation using checklists, sampling plans, spot checks, and gold tasks /li liComputer vision annotation support (bounding boxes, polygons, keypoints) as needed /li liContent safety labeling to ensure policy-compliant outputs /li liDocument edge cases, track error patterns, and propose guideline/rubric improvements /li liAsynchronous collaboration with data ops, QA,



and project leads in a remote workflow /li /ul h3Required Qualifications /h3 ul liMid-Senior experience in data labeling or data annotation operations /li liStrong attention to detail and ability to follow structured rubrics and guidelines /li liFamiliarity with NLP concepts (classification, NER, sentiment) and LLM training pipelines /li liAbility to explain labeling decisions clearly and maintain consistent quality under deadlines /li /ul h3Preferred /h3 ul liExperience with RLHF, large language model evaluation, and audit-ready QA workflows /li liExposure to computer vision annotation formats and inter-annotator agreement methods /li liBackground supporting AI labs, tech startups, BPOs, or annotation vendors /li /ul h3Employment Details /h3 pWorkplace: Remote (asynchronous collaboration). Employment Type: FULL_TIME. This role aligns to Madrid job-search intent for remote opportunities while operating fully online. /p /p #J-18808-Ljbffr

📌 Remote Data Labeling Jobs in Madrid
🏢 Rex.zone
📍 Madrid