AI Engineer World's Fair 2026 — unofficial import demo

Everywhere else in the company, an AI pilot can reach production in weeks. For our member-facing clinical assistant, it can't, and that single constraint redesigned our entire architecture. This is a field report on building conversational AI in a regulated digital health setting, where "move fast and break things" isn't a culture choice. It's a liability. We'll get concrete about what changes when every output has to be clinically safe, auditable, and compliant: PHI is protected by architecture, not policy. Production and non-production are hard-isolated, dashboards are sanitized, and engineers outside the US never touch protected health information. Must-not-fail behavior never lives in a prompt. Emergency escalation and intent routing run as deterministic rules at the top of every conversation turn, before the model is consulted. If you can't afford to get something wrong, you don't leave it to a probabilistic system. Clinical safety is a continuous eval layer. ~30 LLM-as-judge evaluators score clinical accuracy, clinical safety, escalation routing, and recommendation relevance, continuously, not once. Every output is auditable. Each turn, tool call, and reasoning step is traced so outputs can be reviewed and meet regulated reporting obligations. The throughline: in regulated healthcare, compliance constraints aren't a tax you pay around the architecture. They become the architecture. We'll talk about why guardrails-first is the only way to ship member-facing health AI, and why "painfully slow" is sometimes exactly right. (This is non-diagnostic, member-facing AI. The talk is about engineering discipline under regulation, not medical claims.) Key takeaways - In regulated health AI, "move fast" is the wrong default. Design for deliberate, careful launches. - Must-not-fail behaviors belong in deterministic rules at the top of every turn, never in the prompt. - Protect PHI through architecture: isolate prod from non-prod, sanitize dashboards, restrict access by role and geography. - Make every output auditable. Trace each turn, tool call, and reasoning step so safety is reviewable, not assumed. - Treat clinical safety as a continuous LLM-as-judge layer, not a one-time gate.