Agent / AI Engineer - Zaragoza, Spain

About Nethermind Nethermind is a blockchain research and software engineering company building high-performance infrastructure, security tooling, and cryptographic systems across the Ethereum ecosystem and beyond. We work closely with protocol teams, L2s, and ZK projects to help design, review, and secure cutting-edge decentralized systems. We are looking for an Agent / AI Engineer to build AI workflows that interact with real-world systems, data, users, and operational tools. This is a production AI role, not a generic chatbot role. The systems must be useful, reliable, measurable, safe, and connected to real products and real environments. Responsibilities: Build AI agents and workflows for customer-facing and operator-facing use cases. Design tool-use patterns that allow AI systems to interact safely with backend systems and device data. Build retrieval, structured outputs, evaluations, prompts, guardrails, monitoring, and fallback behavior. Work with product and design to create trustworthy AI user experiences. Work with backend and edge engineers to connect AI workflows to real system data. Measure AI performance in terms of task completion, accuracy, safety, user experience, and commercial value. Support demos, pilots, and iteration based on customer feedback.   Requirements: Experience building AI, LLM, agentic, conversational, recommendation, or automation systems. Strong programming ability in Python, TypeScript, or similar. Experience with LLM APIs, tool calling, retrieval, structured outputs, evaluations, and production AI workflows. Understanding of prompt engineering, RAG, agent orchestration, AI evaluation, and common AI failure modes. Ability to build systems that are reliable, useful, and maintainable. English fluency required.   Must Haves: Experience with AI agents for commerce, customer support, retail, payments, kiosks, robotics, voice interfaces, or physical-world systems. Experience with personalization, recommendations, or conversational UX. Experience with permissioning, user authentication, transaction approval, or safety-critical workflows. Experience with multilingual AI systems. Experience with speech, audio, multimodal AI, or on-device AI.   Success in the first 90 days: You build the first working AI workflow for a product demo. You connect AI workflows to relevant data and safe system actions. You create an evaluation framework for usefulness, accuracy, and safety. You help produce compelling demos for partners and investors.   Success in the first 6-12 months: AI workflows are running in real pilot environments. The AI layer has guardrails, evaluation, monitoring, and measurable value. You become a key owner of the company's AI systems. Our Commitment to Diversity At Nethermind, we celebrate diversity and are committed to creating an inclusive environment for all team members. We believe a variety of perspectives drives innovation and leads to better solutions for the blockchain community.   Ready to Join Us? If you're passionate about blockchain and eager to make an impact, we’d love to hear from you. Click Apply for this job to start your journey with Nethermind.