Prove it works before your customer or regulator asks.
How are you going to prove that it works? If you don't know before you start building, you're storing up problems. The most costly testing is the kind you bolt on after the fact — reverse-engineering what the software is supposed to do, unpicking assumptions, and trying to pin down requirements and behaviours scattered across documents and peoples heads.
Beginning with the end in mind changes everything. When you define what success looks like up front, and you know how to prove it, your requirements get sharper instantly. Then you can move efficiently through implementation and measure progress against something real. This is the thinking behind test-driven development, and it works.
But this is the real world. Teams move fast, experiment, iterate. I've noticed this a lot in technology development where the requirements barely exist when you start. This works until you've got a product full of features that nobody can fully explain, no single person who understands all of it, and a customer or regulator asking you to demonstrate that it's been properly verified.
I can help you get from where you are now to a place where your testing is structured, your requirements are testable, and your CI/CD pipeline gives you genuine confidence in every release.