25-Year Platform-First Advocate Argues AI Agents Demand Feature-First Codebases

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A veteran software architect with 25 years of experience building platform-first systems argues that the approach is no longer effective in an AI-driven development environment. He cites data showing roughly 60% of features on a six-month roadmap become obsolete before launch, and a McKinsey 2025 survey finding that 88% of organizations use AI but only 6% see real bottom-line impact. The author contends that AI agents perform best when tasks are small, bounded, and self-contained, conditions that traditional horizontal platform architectures fail to provide. He advocates for vertical slice architecture, popularized by Jimmy Bogard, which organizes code by feature rather than technical layer, giving agents a single folder with everything needed to complete a task. McKinsey's May 2026 report describing overnight agent-driven development cycles, dubbed the '24-hour sprint,' reinforces his case that delivery models must change to fully realize AI productivity gains.

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