Michael Lopp in 2005:

The Free Electron is the single most productive engineer that you’re ever going to meet. I have not even provided a definition and I’m guessing a person has already popped into your mind that fits the bill.

A Free Electron can do anything when it comes to code. They can write a complete application from scratch, learn a language in a weekend, and, most importantly, they can dive into a tremendous pile of spaghetti code, make sense of it, and actually getting it working. You can build an entire businesses around a Free Electron. They’re that good.

This piece has aged very well. I recommend savoring every sentence.