About Us: Luzia is Europe’s fastest-growing AI consumer company, redefining conversational AI with cutting-edge large language models and an unparalleled user experience. At Luzia, we ship fast: keep it simple, learn from every experiment, own outcomes, and build what our users need. it’s how we win.
⚡ Hypergrowth startup with 80M+ users worldwide in under 3 years.
As a Fullstack Engineer, you’ll join our engineering team in Madrid, driving the development of scalable, high-impact solutions that power our AI-driven products.
We’re looking for engineers who care about craft, interaction, and user experience, and who enjoy experimenting with new ideas. The best candidates for this role often build side projects, prototype new interfaces, explore emerging AI capabilities, or experiment with creative app experiences.
Ship across the stack - Build and maintain backend services in Python and production-grade frontends in TypeScript and Next.js. Architect scalable backend systems - Design and maintain backend services and APIs that power real-time AI interactions at scale. Ensure performance, reliability,



and cost-efficiency as we grow rapidly across markets.
Use modern AI-assisted development tools to accelerate development cycles while maintaining strong engineering quality.
Raise the technical bar - Write clean, maintainable, well-tested code. Think in systems, not just tickets - Anticipate bottlenecks before they happen - whether in performance, UX, cost, or scalability. 5 years of experience as a software engineer building and shipping production systems used by real users
~ Strong backend experience in Python
~ Strong frontend experience in TypeScript and Next.js, with an eye for usability, performance, and interaction design
~ Curiosity about working across the stack, including backend services and APIs that power mobile experiences
~ Interest in AI-assisted software development, modern developer tooling, and experimenting with new ways of building products

Working model This is a hybrid role based in our Madrid office - you’ll combine working from our office and working from home

📌 Senior AI-Driven Full-Stack Engineer (Hybrid Madrid)
🏢 luzia
📍 Madrid