Why we quote fixed price, and what that demands of us
Fixed price is not a pricing preference. It's a constraint that forces us to understand the problem before we ask you to fund the solution.
Under time-and-materials, ambiguity is billable. Under fixed price, ambiguity is our problem — which is why our first four stages are all about removing it before anyone writes code.
What it requires
It requires studying the industry, shadowing the operation, and being willing to say a scope is not yet understood well enough to price. It also requires the discipline to decline work where the brief keeps moving, because a fixed price against a moving target is a promise nobody can keep.
The upside for you is a number you can take to a board, and an incentive structure where speed and clarity are ours to gain rather than yours to fund.