Nicolas Chaillan replaced 40 engineers, a team of analysts, a trading floor, and a school teacher — with AI agents running 24/7 for $200 a day. He built the system that did it. He sold it to the Pentagon. Now he's writing the book about what it means for your career, your kids, and your country.
About the Book
REPLACEMENT is the book that says what every AI insider knows but nobody will say out loud. Nicolas built AI for the Pentagon, sold Ask Sage for $250M, and now runs thirteen AI agents for roughly $200 a day — replacing the work of 40+ people.
This is not a doomsday warning. It's a solutions book — a playbook on which skills survive, how to build a one-person company with AI, how to future‑proof your career, and what to teach your kids.
Nicolas runs 13 AI agents for $200 a day. They do the work that used to require a team of forty people and over $10 million a year in salaries. That's not a thought experiment. That's his Tuesday.
Replacement tells that story — from a childhood in Marseille writing code at age 7, to becoming the first Chief Software Officer of the U.S. Air Force and Space Force, to building 13 companies and engineering a $250 million exit with Ask Sage. It's the story of a builder who watched the tools he created start replacing the people he built them for.
This isn't another book about disruption. The word is replacement — of entire teams, entire professions, entire career paths. It's happening now, and America is sleepwalking through it while China deploys.
Every chapter weaves four threads: the immigrant who coded his way out of Marseille, the builder who started 13 companies, the Pentagon insider who saw China deploying while America debated, and the father worried about the world his daughters will inherit.
What People Are Saying
“Replacement isn’t just a book about technology or business, it’s about how to adapt and survive in modern society. Nicolas has inspired me to rethink how I operate the rest of my career; and, more importantly, how I shape my conversations with my daughters about their future. This book has arrived in the ‘Nic’ of time!”
— Joe Saunders, CEO, RunSafe Security
“I’ve known Nicolas Chaillan for years as a path-breaker in the Department of Defense. He brought Big Bang DevSecOps into DoD when containers were still barely understood in government circles as a serious way to build and deploy software. He brought AI into government when too many policymakers were still trapped between fear, confusion, and fantasy. That is Nic’s pattern: he sees where the world is going before institutions are ready to admit it.
Replacement is powerful because it goes beyond AI or the future of work. At its core, it’s about judgment, courage, and having the moral compass to speak hard truths before the rest of the world is ready to hear them. Nic connects the principles that shaped his life, from Marseille to America to the Pentagon, to the defining question of this era: what happens when AI rewrites the old bargain between skill, work, and opportunity?
I’ve also known the more personal side of Nic: generous, loyal, and willing to bet on people and technologies before the rest of the world sees what he sees. His argument about the future of work is sharp, urgent, and compelling. What makes this book matter is that it comes from someone who has spent his life building the future early, not commenting on it after the fact.”
— Reuben Cleetus
"I woke up at 6 AM on a Tuesday in January 2026 and watched my AI agents finish the work that would have required a team of forty people. I made a coffee. I was scared." — From the Prologue
Who Should Read This
- → Executives and founders navigating AI-driven workforce change and figuring out what it actually means for their organizations
- → Military and government leaders navigating national security implications
- → Professionals and workers at risk of job displacement
- → Policymakers shaping the next decade of labor and education policy
- → Parents thinking about what skills their kids need for the future
- → If you care about America winning the AI race against China
- → If you’re tired of AI hype and want the truth from someone who lived it