About Us

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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 Q, 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.

What You’ll Do

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- 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: structured logs, OTEL tracing across the agent graph, cost, latency and

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