We're partnering with a leading enterprise organisation investing heavily in AI and looking for an experienced Senior Backend Engineer to build the backend services that power production AI applications.
This is a hands-on engineering role where you'll design, build and operate scalable Python services, working closely with AI Engineers, Data Scientists and Platform teams to deliver secure, reliable and high-performing systems.
The Role
You'll take ownership of backend services from design through to production, helping shape architecture and engineering standards while solving real-world challenges around scalability, reliability and AI integration.
Key Responsibilities
Design and develop scalable backend services and REST APIs using Python.
Integrate AI, machine learning and Large Language Model (LLM) capabilities into production applications.
Build secure, resilient and observable cloud-native services.
Design data models, APIs and system integrations.
Improve testing, CI/CD pipelines, monitoring and operational excellence.
Collaborate with cross-functional engineering teams, architects and product stakeholders.
Mentor engineers and contribute to technical decision-making and best practice.




What We're Looking For
Strong commercial experience developing backend applications with Python.
Experience designing APIs and distributed backend systems.
Knowledge of cloud platforms (AWS preferred).
Experience with Docker and Kubernetes.
Strong understanding of databases, data modelling and system integration.
Good knowledge of CI/CD, testing and observability.
Ability to make sound architectural decisions and communicate technical trade-offs.
FastAPI
Terraform
Amazon EKS
PostgreSQL or Aurora
Event-driven or asynchronous architectures
Production AI or LLM integration
Enterprise-scale software engineering
Why Apply?
Work on cutting-edge AI products moving into production.
Influence technical architecture and engineering standards.
Join a collaborative team solving complex engineering challenges.
Hybrid working with excellent long-term career opportunities.
If you're an experienced Backend Engineer looking to build production-grade AI systems and have a genuine impact on architecture and engineering direction, I'd be keen to speak with you.
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📌 Senior Back End Engineer (Barcelona)
🏢 SustainRecruit Talent
📍 Barcelona