About Us
Quadrivia is the health technology company behind Q, a comprehensive, controllable, and customizable assistant AI built by clinicians, for clinicians. Addressing the urgent shortage of healthcare professionals, Q provides real-time, personal, and reliable support for clinical tasks across the care continuum. Designed for providers, payers, and pharmaceutical companies, Q is easy to customize and integrates seamlessly into workflows, delivering precise assistance across the care spectrum.

The Role
You'll build and run
Cortex
, the core AI architecture behind Qu, and the services that sit on top of it: automated AI audits, patient simulators, retrieval (RAG), and the escalation agents that take over in red-guardrail situations. This is a backend role first. The job is to make our AI systems reliable, fast, and observable in production, not to invent new ML. You own the software underneath the agents.

We're a small team that ships real systems. We've built our entire AI-driven evaluation system, our voice orchestrator, and a multi-hierarchical RAG platform from scratch.





What You'll Do
- Design and maintain robust, modular backend systems using clean architectural (SOLID) principles to ensure long-term maintainability, scalability and flexibility as the agentic stack evolves.
- Own Cortex end-to-end: architecture, API design, service boundaries, reliability targets, and proactively managing failure modes.
- Build the platform services around it. The automated audit and eval pipeline, patient simulators for testing agents at scale, and the retrieval layer.
- Write fast, well-tested Python services with FastAPI, asyncio, and pydantic, and get the queues, caching, and data stores right.
- Wire up the multi-agent orchestration: routing between agents, shared state, and clean tool interfaces.
- Engineer the RAG pipeline for high-signal retrieval (chunking, hybrid search, re-ranking, caching) and prove the grounding holds.
- Make the whole thing observable: struct

📌 AI Engineer Backend (Barcelona)
🏢 Quadrivia AI
📍 Barcelona