AI changes twenty-four roles, not one, and hours saved are not dollars saved.

AI agents do not change one role. They change twenty-four, at different intensities and at different times, which is why a single AI roadmap for all of engineering is a category error. This playbook maps the impact persona by persona across a 5,000-engineer enterprise SDLC, configures GitHub Copilot for each role, sequences adoption in four waves across twelve months, and ties every recovered hour to a Conversion Action, because time saved is not money saved until a deliberate step turns it into cost reduction, revenue growth, or a better employee experience.