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. 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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