Senior Python Developer

We're looking for a Senior Python Developer to join our team in Madrid or Barcelona, Spain in a hybrid working mode. In this role, you will design and implement secure, high-performing backend services that enable generative AI-driven applications across Azure.

Responsibilities

• Design, build and maintain GraphQL APIs using FastAPI and Strawberry.
• Integrate AI and LLM APIs (e.g., OpenAI, Anthropic) into backend services with secure data handling.
• Architect relational database schemas and implement version‑controlled migrations for consistency and performance.
• Collaborate with DevOps/MLOps teams to containerize and deploy services on Azure.
• Monitor, troubleshoot and optimize backend performance for speed, scalability and cost efficiency.
• Implement unit and integration tests to ensure reliability and maintainability.
• Apply best practices for API security, performance tuning and error handling.
• Participate in CI/CD processes and improve observability for production systems.

Requirements

• Degree in Computer Science, Software Engineering or related field.
• Proven experience as a Python Developer building backend services with FastAPI.
• Hands‑on experience developing GraphQL APIs with tools such as Strawberry.
• Strong knowledge of SQL and relational database design; experience with ORMs (e.g., SQLAlchemy).
• Familiarity with integrating AI/LLM APIs and Model Context Protocol (MCP).
• Proficiency in Git, Docker and CI/CD fundamentals.
• Understanding of performance optimization, scalability and monitoring practices.
• Strong problem‑solving skills and ability to work independently and collaboratively.
• Excellent English communication skills.
• Nice to have: Experience with vector databases or RAG (Retrieval‑Augmented Generation) pipelines.
• Hands‑on experience deploying applications in Microsoft Azure environments.
• Familiarity with observability tools and logging frameworks.