Every marketer is now a growth engineer.

The production side of marketing got cheap: writing, design, variants, whole landing pages. When everyone can produce, production separates no one. What is scarce now is the person who can direct the machine instead of approving whatever it returns, keep the work tell-apart-able when every competitor runs the same models, and prove the work moved a number on evidence a sceptic would accept.

The category now has manifestos, job boards, university courses and certifications for the role, under several competing names. Every one of them names a person. None of them names a bar: what must be true of your stack before the title is earned? A role you cannot fail at is a business card, not a discipline. This one has a bar with six layers, all answering to one growth target: Growth Graph (the system knows the business), Direction (you make the big calls and the machine keeps to them), Distinctiveness (the work stays tell-apart-able), Experiments (beliefs that can lose, tested before money is spent), Agents (the daily work, under gates), and Evaluation (every piece checked before it ships, and what moved read after). Each is written out on the practice page.

You do not need to write code. You need to specify a problem precisely enough that a machine can execute it, and verify the result without taking the machine's word for it. The mandate is testable: Stack Score grades your stack and reads your grade at the weakest point, because that is where a stack fails. The layers are learnable: join the Growth Engineering programme and the whole system is installed on your own business, so you learn all six by running them.