Quadrivia is the health technology company behind Qu, a comprehensive, controllable, and customizable assistant AI built by clinicians, for clinicians. Addressing the urgent shortage of healthcare professionals, Qu provides real-time, personal, and reliable support for clinical tasks across the care continuum. Designed for providers, payers, and pharmaceutical companies, Qu is easy to customize and integrates seamlessly into workflows, delivering precise assistance across the care spectrum.
The RoleOwn and evolve the core “brain” service that powers Qu. Design, build, and operate multi-agent LLM systems that communicate in real time over text and voice. Ship fast Python services with FastAPI, keep latency low, quality high, and evaluation continuous.
What You’ll DoOwn Qu’s brain service end to end: architecture, SLAs, latency budgets, error modes, rollouts.
Low-latency comms: streaming text and voice, VAD, barge-in, turn-taking, interruption handling. WebRTC, SIP, and LiveKit experience is a strong plus.
Multi-agent orchestration: planner–executor–critic patterns, role routing, shared memory, tool routers, coordination protocols and evaluation.
Reasoning & optimization: ReAct, Chain-of-Thought, plus Tree-/Graph-of-Thoughts when useful.
Programmatic prompt optimization: DSPy for prompt/program compilation; integrate MiPRO and GEPA for iterative prompt evolution under eval constraints.
RAG engineering: high-signal retrieval (chunking, hybrid search, re-ranking), query rewriting, compression, caching, freshness, and strong grounding; evaluate faithfulness, context precision/recall, and answer relevancy.
Evaluation & observability: Pre-call validate inputs, enforce safety, and verify retrieval quality for RAG; in-call trace prompts, tool calls, token/latency/cost and enforce streaming guardrails; post-call run automated task evals (faithfulness, relevancy, hallucination, safety), regressions, red-teaming, and CI/CD gates. Instrument with structured logs and OpenTelemetry, surface dashboards and alerts, and feed live traffic slices into shadow evals for drift detection.
5+ years in ML or backend engineering in product environments; recent focus on LLM systems.
Expert Python. Strong FastAPI, asyncio, pydantic, and production observability.
Real-time systems: you’ve built or integrated low-latency text/voice. You have used LiveKit, Pipecat or similar tech.
Working knowledge of agent patterns and eval-driven development.
Hands-on with ReAct and CoT; pragmatic with ToT/GoT tradeoffs.
Prior startup experience.
DSPy for compilation and self-improving workflows; MiPRO/GEPA integration.
Experience with evaluation tooling and LLM-as-judge setups.
WebRTC/SRTP, jitter buffers, SIP basics; LiveKit a plus.
LiveKit Agents, SIP–WebRTC gateways, TURN/SFU tuning.
GCP: Cloud Run/GKE, Pub/Sub, Vertex AI, GCS, Secret Manager, Cloud Logging/Trace.
Healthcare data familiarity.
Push median voice round-trip under 2 seconds while preserving turn-taking and barge-in.
Set up OTEL-first tracing for the agent graph with automated eval triggers on production traffic slices.
Improve our RAG pipeline with hybrid retrieval and re-ranking, then prove gains via faithfulness and context metrics with regression harnesses.
Turn EHR integrations into LLM tools.
Python, FastAPI, pydantic, asyncio, Redis, Postgres, vector stores, WebRTC stacks, LiveKit, SIP gateways, STT/TTS, Docker, Terraform, K8s, OTEL, DeepEval.
What You GetWork on cutting-edge real-time agent tech with a best-in-class team in healthtech.
Fun off-sites in Barcelona.
High-tech laptop and solid dev ergonomics.
Flexibility: work from home or hybrid in Barcelona/London.
Skills Required
- 5+ years in ML or backend engineering
- Expert in Python
- Strong FastAPI, asyncio, pydantic, and production observability
- Experience with low-latency text/voice systems
- Hands-on with ReAct and CoT
What We Do
Quadrivia is building Qu, a personal clinical assistant with wide capabilities across the care spectrum. It is designed by clinicians for clinicians, and the communities we serve. According to the World Health Organization, there is a global shortfall of up to 18 million healthcare workers. A root cause of the worldwide challenge with the quality, accessibility and affordability of healthcare is this structural imbalance between elastic demand by population and constrained supply of providers. Care is delivered globally in many different ways. By making Qu comprehensive, controllable and customizable, we aim to help healthcare professionals be in control of AI’s utility, safety and quality. Qu’s cognitive architecture of expanding agents is designed to support clinicians not just for a single task but across the full stack of routine clinical and administrative tasks, patient interactions, decision-making, chronic and post operative care, continuous monitoring and support, in multiple languages.
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