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Lead Product Designer - AI Trainer - Freelance - 8-20hrs/week - Remote at 10x Team. Remote Location: Spain. Updated: 16 April 2026. Freelance | 8–20 hrs/week | Remote (EU/UK). Are you an experienced product designer who instinctively spots gaps in design reasoning and understands the complex realities of product design practice? Do you have 8 to 20 hours per week available alongside your main job or consulting projects? Join us in shaping how AI understands and applies product design expertise at scale.. About the Role. 10x.team connects expert freelancers with leading AI labs building next-generation models. We are looking for knowledgeable product designers based in the EU or UK to enhance the accuracy, depth, and real-world relevance of AI-powered design systems.. What You Will Do. Review and refine AI-generated outputs related to product design, design processes, documentation, and practical aspects of product development. Evaluate AI responses for creative quality, practical application, and compliance with real-world requirements. Draft realistic product design scenarios based on your direct professional experience. Create scenario variations from different perspectives (e.g. product designer, client, user, or stakeholder). Identify gaps, oversights, or weak reasoning in AI-generated design content. In simple terms: You will assess and improve AI-generated content, ensuring it reflects true product design reasoning, authentic documentation, and practical procedures. Rather than conducting traditional design projects, you’ll apply your expertise to help AI systems understand and reason about product design at scale.. Who You Are. A senior-level product designer with significant professional experience within the EU or UK. Experienced in advising on, preparing, and executing product design projects. Skilled at evaluating design solutions, documentation, and compliance with requirements. Comfortable working independently and providing structured, critical feedback. Available for 8–20 hours per week, with prompt availability. Why Join?. Flexible, fully remote freelance work that fits your current commitments. Apply your product design expertise in a rapidly evolving, high-impact AI environment. Directly contribute to building advanced AI-powered design systems. Free access to our in-house AI Academy to further develop your AI skillset. Clear onboarding, structured tasks, and ongoing opportunities for collaboration. How to apply. To complete your application, you’ll receive an email right after applying with a link to:. A short written evaluation. A brief AI-powered interview. A quick compliance check (credentials & identity). Important:. Your application is only complete once you finish these steps via the link in the email.. After successful onboarding, you’ll be eligible to start on upcoming projects as they become available.. Join us to help shape the product design expertise of the world’s most advanced AI models!. #LI-TT1