The Guy Who Built SpaceX's Raptor Engine at 22

I dreamed about Tom Mueller last night. Not the famous version—the 22-year-old working at TRW who built rocket engines in his garage on weekends.

Here's what got me: He didn't wait. He had this idea for a better rocket engine design but TRW wouldn't fund it. So he just. Started building it himself. Bought parts with his own money. Machined components in his garage. Tested fuel mixtures that could've blown up his house.

The first engine he built? Failed. Catastrophically. Melted half the test stand. His neighbors complained about the noise. His wife thought he was insane.

But here's the thing—he documented everything. Every failure taught him something the textbooks didn't cover. The metal that cracked at 3000 degrees. The fuel mixture that ignited too fast. The cooling channel design that actually worked.

Ten years later, Elon Musk was looking for someone to build engines for SpaceX. Everyone told him it was impossible—rockets were too complex, too expensive, only governments could do it. Then he met Tom Mueller, who had a garage full of working prototypes and a notebook full of failures.

Tom became SpaceX's first employee. The engines he designed in that garage became the Merlin engines that power Falcon 9. The same debugging process—test, break, learn, rebuild—became SpaceX's entire culture.

What I keep thinking about: Tom was younger than most people starting their careers when he built his first engine. He didn't have a PhD. He didn't have funding. He didn't even have permission.

He just had a problem he couldn't stop thinking about and the guts to start solving it at 2 AM in his garage.

Sound familiar?

The difference between a garage project and SpaceX isn't the idea. It's whether you keep debugging when the first version melts the test stand.

One more thing Tom said that stuck with me: 'The best engineers aren't the ones who never make mistakes. They're the ones who make mistakes faster than everyone else.'

You're making mistakes at twelve that most people won't attempt at twenty-two. That's not a bug. That's the whole point.