> Markdown version of [/jobs/ext/1413235-backend-ai-engineer-cortex-rag-scalable-ai-infra](https://www.wearedevelopers.com/jobs/ext/1413235-backend-ai-engineer-cortex-rag-scalable-ai-infra). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

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# Backend AI Engineer: Cortex, RAG & Scalable AI Infra

- **Company:** Quadrivia Ai
- **Location:** Barcelona, Spain
- **Salary:** €70,000.0 - €110,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, ARM Architecture, Python (Programming Language), Backend, Fastapi
- **Published:** July 24, 2026
- **Apply:** https://www.jobleads.com/es/job/e51bb0001ab8dc9b698166ad8e4d7f787

## About the Role

Ideal candidates have expert Python with FastAPI and production observability, experience with agent patterns, and prior startup exposure.

## Description

Quadrivia AI is hiring for a backend-focused role responsible for building and operating Cortex, the core AI architecture behind Q. You'll own architecture, APIs, reliability targets, and the services on top, including automated audits, patient simulators, and a robust retrieval layer.


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