Senior Backend Engineer (Python / Data)

Location: Spain, Remote (flexible across Spain)

Compensation: Up to €65,000 per year

Build data and ML powered backend systems for a major global airline. Design, build and maintain scalable, secure server‑side systems, focusing on microservices, APIs and deploying AI/ML models in production.

Responsibilities

• Design and implement scalable backend services and APIs using Python, FastAPI, or Flask.
• Integrate AI and ML models into backend systems and expose them through clean, performant endpoints using REST, gRPC, or GraphQL.
• Optimize database queries and schemas (PostgreSQL, MySQL, MongoDB) for performance and reliability.
• Write unit and integration tests and maintain clear technical documentation.
• Monitor and optimize system performance using observability tooling (CloudWatch, Datadog).
• Manage infrastructure with AWS (including database ...