ph3What You’ll Do /h3 ul liBuild magical AI product experiences – Design and implement fast, intuitive, and engaging experiences that make AI feel natural and useful. Work closely with product and design to explore new interaction patterns, prototype ideas quickly, and turn cutting‑edge AI capabilities into simple experiences that millions of users enjoy. /li liShip across the stack – Build and maintain backend services in Python and production‑grade frontends in TypeScript and Next.js. Move fluidly between layers, owning features end to end. /li liArchitect 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. /li liMove fast, ship often – Operate with high ownership and urgency. Prototype quickly, validate with users, and iterate based on real‑world feedback. Use modern AI‑assisted development tools to accelerate development cycles while maintaining strong engineering quality. /li liCollaborate across AI, product growth – Work cross‑functionally with AI engineers, product managers, designers, and growth teams to translate experimentation and insights into production‑ready systems. /li liRaise the technical bar – Write clean, maintainable, well‑tested code. Contribute to architecture decisions, improve developer experience, and help establish best practices that enable the team to scale. /li liThink in systems, not just tickets – Anticipate bottlenecks before they happen – whether in performance, UX, cost, or scalability. Proactively improve observability, reliability, and infrastructure as we scale.



/li liMentor lead by example – Provide thoughtful code reviews, support other engineers, and help shape a strong engineering culture centered around ownership, craftsmanship, and impact. /li /ul h3What We’re Looking For /h3 ul li+5 years of experience as a software engineer building and shipping production systems used by real users /li liStrong backend experience in Python /li liStrong frontend experience in TypeScript and Next.js, with an eye for usability, performance, and interaction design /li liHands‑on experience building AI agents end‑to‑end – including tool use, orchestration, evaluation, and shipping them to production /li liExperience building or integrating AI/LLM‑powered features in consumer‑facing products /li liCuriosity about working across the stack, including backend services and APIs that power mobile experiences /li liComfort working in fast‑paced startup environments with ambiguity and rapid iteration /li liStrong product intuition: you care deeply about how things feel for users, not just how they are implemented /li liExperience building systems or applications used by large numbers of users /li liOwnership mindset: you see problems, take initiative, and drive solutions end‑to‑end /li liInterest in AI‑assisted software development, modern developer tooling, and experimenting with new ways of building products /li /ul h3Nice to have /h3 ul liExperience with LangGraph and/or LangChain /li /ul h3Working model /h3 pThis is a hybrid role based in our Madrid office – you’ll combine working from our office and working from home. /p h3Equal opportunity /h3 pLuzia is an equal opportunity employer. We hire based on what you build and how you think. /p /p #J-18808-Ljbffr

📌 Senior Software Engineer – Fullstack (Madrid)
🏢 luzia
📍 Madrid