Replacement

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.

What This Book Is About

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.

Four threads run through every chapter: the immigrant who chose America, the serial builder who sees the patterns, the national security insider who knows what China is doing, and the father of three daughters who is scared about the world they'll inherit. This is the book Nicolas had to write — not because he wanted to, but because nobody else has lived it from every angle.

Who Should Read This

• → If you're a professional wondering whether AI will take your job
• → If you're a parent wondering what skills to teach your kids
• → If you're a founder trying to figure out what AI actually changes
• → 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