Senior Back-end Developer (Python / AI agents) - barcelona
19 hours ago
Barcelona
Nuestro cliente: startup tecnológica europea especializada en inteligencia artificial aplicada a entornos físicos de alto tráfico, como centros comerciales, aeropuertos, destinos de ocio y cruceros We’re looking for a Senior BackEnd Engineer — someone who wants to design, build and own the entire backend and systems architecture of the company. You'll own the backend, APIs, microservices, data flows, real-time orchestration, and ML integrations end-to-end—ensuring performance, security, and scalability as we expand across international portfolios. Requiriments: • 5+ years building backend systems at scale., • Strong expertise in Python (FastAPI o Django), SQL (Postgres/MySQL), and REST/GraphQL APIs., • Experience with microservices and Cloud Run (Kubernetes, Pub/Sub, queues, caching removed as requested), • Strong in schema design, migrations, indexing, performance tuning., • Experience integrating external APIs (OAuth, webhooks)., • Familiarity with LLM integrations, retrieval pipelines, or vector DBs (Qdrant) is a plus., • Previously owned a backend/platform in a startup or led a technical project end-to-end., • Ability to act as tech lead when needed: drive decisions, review architecture, guide junior/mid engineers, and push delivery., • Bias for simple, reliable, resilient systems., • Autonomous, fast, and comfortable in messy zero-to-one environments., • Clear communicator, proactive, opinionated, and hands-on. Valued: knowledge of Typescript, Javascript, React (not required but appreciated). ¿Qué ofrecen? • Súmate a un proyecto startup con alto potencial de desarrollo y escalabilidad, • Oportunidades únicas de crecer y desarrollarte en una empresa en pleno crecimiento., • Aprende e innova en un ambiente súper dinámico de startup., • Modalidad híbrida (50% en remoto y 50% en oficinas de Barcelona)., • Contrato indefinido., • This is not a maintenance role. It’s a founding role, with high phantom-share compensation, where you will shape the core platform that powers real-time AI assistants used by millions of visitors across malls, airports, stadiums and resorts. Main Functions: This role sits at the intersection of AI, product engineering, infrastructure, data architecture, and ML operations. • Backend & microservices end-to-end., • Build scalable APIs, workers, queues, and real-time systems on GCP + Cloud Run + Cloud SQL., • Implement integrations with CRMs, CMSs, booking systems, loyalty platforms, and external APIs., • Develop backend support for AI agents: retrieval APIs, embeddings, vector DB, inference services., • Build and maintain event pipelines for analytics, ML, and product insights., • Ensure system security, observability, monitoring, logging, and CI/CD best practices., • Collaborate with Product & AI teams to define technical architecture and implement new features quickly., • Own migrations, deployments, environments, CI/CD, and platform reliability.