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Spec-Driven Development

Five Lessons from Spec-Driven Development Across Regulated Industries

Over the past four articles, we walked through the compliance chasm separating AI-native teams from regulated teams, then went deep into three of the most demanding safety standards in the world — IEC 62304 for medical devices, ISO 26262 for automotive functional safety, and DO-178C for airborne software. The domains are different. The regulatory bodies are different. The terminology is different. But the patterns that emerged are remarkably similar. These five lessons apply whether you're building a blood glucose monitor, an emergency braking system, or a flight management computer. They even apply if you're not in a regulated industry at all.

From Requirement to Release: IEC 62304 Compliance at AI Speed

A Class C medical device. IEC 62304 mandates deliverables across 11 clauses — requirements, architecture, detailed design, unit verification, integration testing, system testing, risk management, traceability, and release documentation. The traditional approach: assemble a cross-functional team, spend four to six months producing Word documents and Excel spreadsheets, and hope nothing changed between the first deliverable and the last. The spec-driven approach: generate every artifact from a single specification, verify coverage deterministically, and produce an audit-ready package in a single sprint. Same artifacts. Same rigor. Fundamentally different economics.

Spec-Driven Development in Regulated Industries: Why Specifications Are Your Most Valuable Asset

Picture two engineering teams. The first — an AI-native startup — ships features in hours. Engineers prompt an LLM, review the output, push to main, and deploy. Their velocity is extraordinary. Their traceability is nonexistent. The second team builds firmware for a Class C medical device. Every requirement lives in a 300-page Word document. Every test case is manually linked to a requirement ID in a spreadsheet. They have full traceability. They also take six weeks to ship a single feature. Both teams are losing.