Sachin Mundra is the founder of SmartGenie and the creator of DevGenie, where he is building the practice of Agentic Code Engineering: making AI-written software safe enough to ship, audit and trust. He has spent 26 years in enterprise IT, more than 20 of them at Microsoft as a senior cloud solution architect, delivering systems where being confidently wrong was never an option. SmartGenie is a Microsoft ISV Success Partner. Today he works hands-on with Claude, Codex and local models every day, and keeps every session log. This lesson is built entirely from those real logs, not slideware theory: the failures, the fixes, and the guardrails he engineers so an AI cannot quietly write down a fact it never checked. He teaches the way he builds, plainly and with the receipts on screen.