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 mixta (50% en remoto y 50% en oficinas de Barcelona).
* Contrato indefinido. 45-60k€ brutos/año en función de experiencia contrastada.
* 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.
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