Artificial intelligence has changed what businesses can build. But the defining question is no longer whether machines can learn. The real question is whether organizations can build systems that endure. In Built to Endure, Venkat argues that while intelligence is becoming accessible and abundant, what remains rare, and increasingly valuable, are systems that deploy intelligence durably, systems that can be understood, audited, modified, extended, and trusted in production. The book explores why many AI initiatives succeed in controlled environments but fail in the real world. Fragility, hidden operational debt, workflow breakdowns, and poor organizational incentives create systems that look impressive in demos but collapse under real conditions. Through practical operating principles, leadership insights, and technical frameworks, the book introduces Durable Product Engineering™: a philosophy of building products that are resilient in production, observable in operation, adaptable in design, and dependable under stress. This is a book about long-term advantage. Because over time, the competition is not between the fast and the slow. It is between the durable and the fragile.