Our partner is looking for a Full Stack Engineer based in Spain. As a Full Stack Engineer – AI Systems, you will build production-ready AI applications that transform how people manage their emails, calendars, notes, and everyday tasks. You will work at the intersection of full-stack engineering and advanced artificial intelligence, developing intelligent agents that deliver seamless, proactive, and intuitive user experiences. Your responsibilities will span frontend and backend development, large language model (LLM) integrations, and sophisticated agentic workflows. You will design systems capable of planning, using tools, retaining context across sessions, and recovering gracefully from unexpected failures. Working alongside experienced engineers and machine learning specialists, you will help establish scalable architectures and reliable AI integration patterns. With a strong focus on performance, low latency, and user trust, you will turn emerging AI capabilities into practical features ready for real-world use. This fully remote opportunity offers significant technical ownership, a greenfield product environment, and the chance to shape the future of AI-powered productivity. Develop and maintain full-stack functionality across frontend interfaces, backend services, and AI integrations, ensuring a seamless user experience. Create multi-step agentic systems capable of planning, executing tasks, interacting with tools, handling failures, and recovering across multiple sessions. Develop real-time user experiences: Improve observability, monitoring, error handling, fallback mechanisms, and recovery strategies to maintain dependable AI-driven functionality. Evaluate and improve AI performance: Collaborate with machine learning and backend engineering teams to establish robust system designs, API structures, and reusable integration patterns. Take ownership of technical implementation, make independent engineering decisions, and deliver high-quality solutions in an evolving product environment. Full-stack development

experience:




Strong professional experience building applications with modern technologies and frameworks, particularly Next.js, Python, and Node.js. Solid understanding of application architecture, API design, distributed systems concepts, and database technologies, including SQL and NoSQL. Reliable AI application development: Demonstrated ability to design robust user experiences that account for network latency, non-deterministic model outputs, graceful degradation, and unexpected failures. DevOps and cloud infrastructure: Experience with containerization, deployment pipelines, and cloud orchestration technologies such as Docker and Kubernetes. Proven ability to take features from initial concept through development, deployment, and ongoing optimization. A user-focused mindset with particular attention to client-side reliability, usability, responsiveness, and the practical value of AI-driven features. Ability to work effectively with cross-functional engineering and machine learning teams while contributing to technical decisions and scalable product development. Location and remote readiness: Based in the Netherlands, with the ability to collaborate effectively within a fully remote, international team. Fully remote work: Flexibility to work remotely as part of a globally distributed team. Work alongside experienced engineers from leading technology companies in a technically ambitious environment. Greenfield product development: Help build an AI-powered productivity platform from the ground up, with opportunities to influence architecture, engineering standards, and product direction. Join a small, highly skilled team that values technical excellence, autonomy, and practical innovation. Expand your expertise at the intersection of full-stack engineering, AI infrastructure, and intelligent product development. Data Privacy Notice: By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR).

📌 Full Stack Developer (Madrid)
🏢 Jobgether
📍 Madrid