There's a specific kind of technology leader who has become endangered: the one who builds things.Not the kind who orchestrates vendors. Not the kind who manages integration roadmaps between Salesforce, HubSpot, and whatever AI wrapper launched last week. I'm talking about the CTO who looks at a problem and thinks, "We should own this."David Heinemeier Hansson (DHH to most) is one of these people. When his company 37signals wanted to build an innovative email product, he didn't start by evaluati...