I think financial industry programmers are at the leading edge of this phenomenon (much like quants were the leading edge of programmers being paid for value rather than for hours), because they're the programmers who can most easily demonstrate that their code directly made a company millions. They're not the end of it by a long shot. Take A/B testing, analytics, conversion optimization, etc. If you are good at thes…
Suppose the website goes down and the company doesn't make its millions and now they can measure no performance increase.
Then there is politics. Big Boss Man might go to his Big Big Boss Man and tell him that he deserves the pay rise because he hired you or brought you in as a consultant, and so you're just a tool to his genius. Good luck with that one.
My point is simple: if the bosses or clients don't want to pay you performance, they can find a million ways to do so. Tough contracts only go so far and my suggestion is to never enter such a relationship unless you're 100% trusting of the bosses or clients.