The engineers who become genuinely irreplaceable aren't the ones nobody else can do without. They're the ones who made everyone around them better — and built a reputation that follows them everywhere they go.Your expertise compounds when you share it. It stagnates when you protect it.

Knowledge hoarding feels like job security. It isn't. It's a ceiling.

They exported it constantly. In code reviews that explained the why behind every suggestion. In Slack threads where they took the time to answer the "dumb question" thoroughly. In pairing sessions where they narrated their thinking out loud instead of just typing the answer.

The best senior engineers I've known didn't hoard knowledge.

The foundation doesn't maintain itself.

I'm not here to shame anyone. I'm here to say: if your company has never seriously discussed contributing to the open source projects it depends on — financially or otherwise — that's worth a conversation.

And most of the companies benefiting from it have never contributed back a single line.

Open source is the foundation of the modern software industry. It powers startups worth billions. It runs inside products used by hundreds of millions of people. It's maintained, in many cases, by a handful of volunteers who do it because they care.

Every developer alive has shipped code that was built on top of someone else's unpaid labor.