Explore full-time and freelance AI Generalist jobs in Madrid for 2026 at Rex.zone. As an AI Generalist, you will power large language model evaluation, RLHF (Reinforcement Learning from Human Feedback), and training data quality pipelines. Whether you are seeking entry-level or senior remote roles, these opportunities involve prompt evaluation, content safety labeling, and NLP model performance improvement.

Join leading AI labs and tech startups to shape the future of LLM training workflows. Discover contract and full-time remote opportunities tailored for Madrid-based professionals looking to advance in computer vision annotation and AI data operations.

Remote AI/ML Data Annotation Specialist

Title: AI Data Annotation Specialist

Date: 25-02-2026

Company: Rexzone

Country: ES

Remote Type: Remote

Employment Type: FULL_TIME

Experience Level: Mid-Senior

Industry: Technology





Job Function: Engineering

Skills: Data Labeling, Computer Vision Annotation, Content Safety Labeling, Named Entity Recognition

Salary Currency: USD

Salary Min: 63360

Salary Max: 126720

Pay Period: YEAR

This remote role focuses on comprehensive data labeling and QA evaluation for LLM training pipelines. You will execute named entity recognition, computer vision annotation, and content safety labeling to support foundational model development. Adecuado for professionals seeking full-time AI Generalist jobs in Madrid 2026, this position requires strict adherence to annotation guidelines compliance and a deep understanding of AI/ML training workflows.

📌 Senior AI Generalist (España)
🏢 Rex.zone
📍 España