The developer funnel

If I ever chatted with you about developer experience in person, I’ve probably drawn the developer funnel for you on the whiteboard. For some reason, I always draw it as a funnel — but any power-law visualization can suffice. As an aside, I do miss the whiteboards. 

At the bottom of the funnel, there are a rare few who know how to speak to computers as directly as humans can. Their perspective on writing data to storage involves programming a controller. As we travel a bit higher, we’ll find a somewhat larger number peeps who write hardcore code (usually C/C++, and more recently, Rust)  that powers operating systems. Higher still, the power law kicks into high gear: there are significantly more people with each click. Developers who write system frameworks are vastly outnumbered by developers who consume them, and there are orders of magnitudes more of those who write Javascript. They are still entirely eclipsed by the number of those who create content.

With each leap in numbers, something else happens — the amount of power passed upward diminishes. Each new layer of abstraction aims to reduce the underlying complexity of computing and in doing so, also collapses the number of choices available to developers who work with that layer. Try to follow the rabbit trail of setting a cookie value, a one-liner in Javascript — and a massive amount of work in the browser that goes into that. Reducing complexity makes the overall mental model of computing simpler and easier to learn, which helps to explain the growing number of developers.

This funnel can be a helpful framing for a conversation about desired qualities of the API. Do we want to have rapid growth? Probably want to be aiming somewhere higher in the funnel, designing convenient, harder to mess up APIs. Want to introduce powerful APIs and not worry about the sharper edges? Expect only a small number of consumers who will understand how to use them effectively.

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