Senior AI Engineer

Citizen Health is building an AI advocate for rare disease patients and their families. The Senior AI Engineer will develop and ship production agentic LLM systems, RAG pipelines, tool-use frameworks, and evaluation infrastructure designed to make the advocate effective, reliable, and safe.

Responsibilities:

• Agentic orchestration — Design and implement the multi-agent architecture that powers our advocate's ability to reason, plan, and execute complex multi-step tasks (scheduling appointments, filing insurance appeals, researching treatment options) with appropriate guardrails and human-in-the-loop checkpoints
• RAG and medical knowledge systems — Build retrieval pipelines over patient medical records, condition-specific knowledge bases, and community-sourced data from 125+ rare disease communities. Ensure the advocate's responses are grounded in the patient's actual medical history, not generic information
• Tool-use and integrations — Build and maintain the frameworks that let our agent take real-world actions: browser automation, phone calls, form filling, document generation, and API integrations with healthcare systems. Each tool-use needs to be reliable, auditable, and scoped to the right permissions
• Conversation intelligence — Design the systems that make the advocate's WhatsApp conversations feel natural, contextual, and proactive. This includes long-term memory, conversation state management, personalization, and knowing when to surface information the patient didn't ask for but needs
• Evaluation and safety — Build evaluation frameworks for agentic outputs in a domain where "good enough" isn't good enough. Develop testing infrastructure for multi-step agent workflows, hallucination detection, medical accuracy validation, and regression testing across model updates
• Prompt engineering and model optimization — Design prompt architectures that balance capability, cost, and latency. Evaluate and integrate new models as the landscape evolves. Optimize inference costs — our unit economics depend on it